0001564590-22-013224 | 10-K | XBRL Viewer

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Document and Entity Information - USD ($) $ in Billions	12 Months Ended
Document and Entity Information - USD ($) $ in Billions	Jan. 31, 2022	Mar. 24, 2022	Jul. 31, 2021
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jan. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Trading Symbol	AMBA
Entity Registrant Name	AMBARELLA, INC.
Entity Central Index Key	0001280263
Current Fiscal Year End Date	--01-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		38,065,304
Entity Public Float			$ 2.8
Entity File Number	001-35667
Entity Tax Identification Number	98-0459628
Entity Address, Address Line One	3101 Jay Street
Entity Address, City or Town	Santa Clara
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95054
City Area Code	408
Local Phone Number	734-8888
Entity Incorporation, State or Country Code	E9
Title of 12(b) Security	Ordinary Shares, $0.00045 Par Value Per Share
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes
Document Annual Report	true
Document Transition Report	false
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	San Jose, California
Auditor Firm ID	238
Documents Incorporated by Reference	Certain information is incorporated into Part III of this report by reference to the Proxy Statement for the Registrant’s annual meeting of shareholders to be held on or about June 7, 2022 to be filed with the Securities and Exchange Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.

Consolidated Balance Sheets - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Current assets:
Cash and cash equivalents	$ 171,043	$ 241,274
Marketable debt securities	0	199,434
Accounts receivable, net	44,307	24,974
Inventories	45,219	26,081
Restricted cash	10	10
Prepaid expenses and other current assets	6,169	5,531
Total current assets	266,748	497,304
Property and equipment, net	10,134	5,530
Deferred tax assets, non-current	15,340	10,914
Intangible assets, net	46,302	18,703
Operating lease right-of-use assets, net	11,127	9,659
Goodwill	303,625	26,601
Other non-current assets	4,269	4,569
Total assets	657,545	573,280
Current liabilities:
Accounts payable	31,170	21,124
Accrued and other current liabilities	52,064	48,126
Operating lease liabilities, current	3,391	2,911
Income taxes payable	1,245	962
Deferred revenue, current	1,414	844
Total current liabilities	89,284	73,967
Operating lease liabilities, non-current	8,322	7,525
Other long-term liabilities	12,763	16,812
Total liabilities	110,369	98,304
Commitments and contingencies (Note 15)	0	0
Shareholders' equity:
Preference shares, $0.00045 par value per share, 20,000,000 shares authorized and no shares issued and outstanding at January 31, 2022 and January 31, 2021, respectively	0	0
Ordinary shares, $0.00045 par value per share, 200,000,000 shares authorized at January 31, 2022 and January 31, 2021, respectively; 37,302,818 shares issued and outstanding at January 31, 2022; 35,547,440 shares issued and outstanding at January 31, 2021	17	16
Additional paid-in capital	447,287	347,458
Accumulated other comprehensive income	0	1,219
Retained earnings	99,872	126,283
Total shareholders’ equity	547,176	474,976
Total liabilities and shareholders' equity	$ 657,545	$ 573,280

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jan. 31, 2022	Jan. 31, 2021
Statement Of Financial Position [Abstract]
Preference shares, par value	$ 0.00045	$ 0.00045
Preference shares, shares authorized	20,000,000	20,000,000
Preference shares, shares issued	0	0
Preference shares, shares outstanding	0	0
Ordinary shares, par value	$ 0.00045	$ 0.00045
Ordinary shares, shares authorized	200,000,000	200,000,000
Ordinary shares, shares issued	37,302,818	35,547,440
Ordinary shares, shares outstanding	37,302,818	35,547,440

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Income Statement [Abstract]
Revenue	$ 331,856	$ 222,990	$ 228,732
Cost of revenue	123,724	87,417	96,023
Gross profit	208,132	135,573	132,709
Operating expenses:
Research and development	167,337	140,759	129,724
Selling, general and administrative	70,438	55,980	52,634
Total operating expenses	237,775	196,739	182,358
Loss from operations	(29,643)	(61,166)	(49,649)
Other income, net	1,002	3,863	8,021
Loss before income taxes	(28,641)	(57,303)	(41,628)
Provision (benefit) for income taxes	(2,230)	2,483	3,164
Net loss	$ (26,411)	$ (59,786)	$ (44,792)
Net loss per share attributable to ordinary shareholders:
Basic	$ (0.72)	$ (1.72)	$ (1.35)
Diluted	$ (0.72)	$ (1.72)	$ (1.35)
Weighted-average shares used to compute net loss per share attributable to ordinary shareholders:
Basic	36,577,120	34,679,717	33,083,562
Diluted	36,577,120	34,679,717	33,083,562

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (26,411)	$ (59,786)	$ (44,792)
Other comprehensive income (loss), net of tax:
Net change and reclassification of unrealized gains (losses) on investments	(1,219)	451	671
Other comprehensive income (loss), net of tax	(1,219)	451	671
Comprehensive loss	$ (27,630)	$ (59,335)	$ (44,121)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Outstanding Ordinary Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Beginning Balance, Amount at Jan. 31, 2019	$ 419,489	$ 15	$ 188,516	$ 97	$ 230,861
Beginning Balance, Shares at Jan. 31, 2019		32,303,540
Exercise of stock options, Amount	$ 5,695	$ 0	5,695	0	0
Exercise of stock options, Shares	366,886	366,886
Vesting of restricted stock units, Amount	$ 0	$ 0	0	0	0
Vesting of restricted stock units, Shares		957,319
Employee stock purchase plan, Amount	5,967	$ 0	5,967	0	0
Employee stock purchase plan, Shares		177,864
Stock-based compensation expense related to stock awards granted to employees and consultants	61,042	$ 0	61,042	0	0
Other comprehensive income (loss) - net of tax	671	0	0	671	0
Net loss	(44,792)	0	0	0	(44,792)
Ending Balance, Amount at Jan. 31, 2020	448,072	$ 15	261,220	768	186,069
Ending Balance, Shares at Jan. 31, 2020		33,805,609
Exercise of stock options, Amount	$ 10,333	$ 0	10,333	0	0
Exercise of stock options, Shares	421,736	421,736
Vesting of restricted stock units, Amount	$ 5,351	$ 1	5,350	0	0
Vesting of restricted stock units, Shares		1,162,883
Employee stock purchase plan, Amount	5,825	$ 0	5,825	0	0
Employee stock purchase plan, Shares		182,931
Stock repurchase, Amount	(1,000)	$ 0	(1,000)	0	0
Stock repurchase, Shares		(25,719)
Stock-based compensation expense related to stock awards granted to employees and consultants	65,730	$ 0	65,730	0	0
Other comprehensive income (loss) - net of tax	451	0	0	451	0
Net loss	(59,786)	0	0	0	(59,786)
Ending Balance, Amount at Jan. 31, 2021	$ 474,976	$ 16	347,458	1,219	126,283
Ending Balance, Shares at Jan. 31, 2021	35,547,440	35,547,440
Exercise of stock options, Amount	$ 7,603	$ 0	7,603	0	0
Exercise of stock options, Shares	269,287	269,287
Vesting of restricted stock units, Amount	$ 4,592	$ 1	4,591	0	0
Vesting of restricted stock units, Shares		1,367,309
Employee stock purchase plan, Amount	7,208	$ 0	7,208	0	0
Employee stock purchase plan, Shares		118,782
Fair value of partially vested equity awards assumed in connection with acquisition	407	$ 0	407	0	0
Stock-based compensation expense related to stock awards granted to employees and consultants	80,020	0	80,020	0	0
Other comprehensive income (loss) - net of tax	(1,219)	0	0	(1,219)	0
Net loss	(26,411)	0	0	$ 0	(26,411)
Ending Balance, Amount at Jan. 31, 2022	$ 547,176	$ 17	$ 447,287		$ 99,872
Ending Balance, Shares at Jan. 31, 2022	37,302,818	37,302,818

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Cash flows from operating activities:
Net loss	$ (26,411)	$ (59,786)	$ (44,792)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	14,007	11,967	11,631
Amortization (accretion) of premium (discount) on marketable debt securities, net	1,034	721	(969)
Stock-based compensation	87,801	70,134	66,871
Deferred income taxes	(4,426)	(514)	187
Other non-cash items, net	(509)	65	(71)
Changes in operating assets and liabilities:
Accounts receivable	(18,600)	(6,487)	7,725
Inventories	(18,944)	(3,110)	(4,719)
Prepaid expenses and other current assets	228	(537)	1,057
Other non-current assets	832	1,141	(3,298)
Accounts payable	9,822	6,214	2,109
Accrued and other current liabilities	(1,954)	12,055	5,079
Income taxes payable	83	272	(302)
Deferred revenue	(131)	144	172
Operating lease liabilities	(3,608)	(2,416)	(2,851)
Other long-term liabilities	(429)	937	1,585
Net cash provided by operating activities	38,795	30,800	39,414
Cash flows from investing activities:
Acquisition, net of cash acquired	(307,038)	0	0
Purchases of investments	(118,726)	(219,677)	(225,913)
Sales of investments	208,132	70,087	96,363
Maturities of investments	107,760	123,208	122,795
Purchase of tangible and intangible assets	(9,679)	(4,942)	(1,821)
Net cash used in investing activities	(119,551)	(31,324)	(8,576)
Cash flows from financing activities:
Stock repurchase	0	(1,000)	0
Proceeds from exercise of stock options and employee stock purchase plan	15,292	16,417	11,960
Payment for intangible assets	(4,767)	(5,021)	(5,444)
Net cash provided by financing activities	10,525	10,396	6,516
Net increase (decrease) in cash, cash equivalents and restricted cash	(70,231)	9,872	37,354
Cash, cash equivalents and restricted cash at beginning of period	241,284	231,412	194,058
Cash, cash equivalents and restricted cash at end of period	171,053	241,284	231,412
Supplemental disclosure of cash flow information:
Cash paid for income taxes	1,869	1,531	1,811
Supplemental disclosure of noncash investing activities:
Unpaid liabilities related to tangible and intangible assets purchases	$ 1,569	$ 4,302	$ 12,284

Organization and Summary of Significant Accounting Policies

12 Months Ended

Jan. 31, 2022

Accounting Policies [Abstract]

Organization and Summary of Significant Accounting Policies

1. Organization and Summary of Significant Accounting Policies

Organization

Ambarella, Inc. (the “Company”) was incorporated in the Cayman Islands on January 15, 2004. The Company is a leading developer of low-power semiconductor solutions offering high-definition (HD) and Ultra HD compression, image processing, and deep neural network processing. The Company combines its processor design capabilities with its expertise in video and image processing, algorithms and software to provide a technology platform that is designed to be easily scalable across multiple applications and enable rapid and efficient product development. The Company’s system-on-a-chip, or SoC, designs fully integrate high-definition video processing, image processing, artificial intelligence (AI) computer vision algorithms, audio processing and system functions onto a single chip, delivering exceptional video and image quality, differentiated functionality and low power consumption. The Company is currently addressing a broad range of human and computer vision applications, including professional and consumer security cameras, automotive cameras such as advanced driver assistance systems (ADAS), electronic mirrors, drive recorders, driver/cabin monitoring systems, autonomous driving, and industrial and robotic applications.

The Company sells its solutions to leading original design manufacturers, or ODMs, and original equipment manufacturers, or OEMs, globally.

Basis of Consolidation

The Company’s fiscal year ends on January 31. The consolidated financial statements of the Company and its subsidiaries have been prepared in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”). All intercompany transactions and balances have been eliminated in consolidation.

Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during the reported periods. Actual results could differ from those estimates.

On an ongoing basis, management evaluates its estimates and assumptions, including those related to (i) business combinations; (ii) write downs of excess and obsolete inventories; (iii) the estimated useful lives of long-lived assets; (iv) the valuation of stock-based compensation awards; (v) the realization of tax assets and estimates of tax liabilities, including reserves for uncertain tax positions. These estimates and assumptions are based on historical experience and on various other factors which the Company believes to be reasonable under the circumstances. The Company may engage third-party valuation specialists to assist with estimates related to the valuation of assets and stock awards associated with various contractual arrangements. Such estimates often require the selection of appropriate valuation methodologies and significant judgment. Actual results could differ from these estimates under different assumptions or circumstances and such differences could be material.

Concentration of Risk

The Company’s products are manufactured, assembled and tested by third-party contractors located primarily in Asia. The Company does not have long-term agreements with these contractors. A significant disruption in the operations of one or more of these contractors would impact the production of the Company’s products which could have a material adverse effect on its business, financial condition and results of operations.

A substantial portion of the Company’s revenue is derived from sales through one of its distributors, WT Microelectronics Co., Ltd., formerly Wintech Microelectronics Co., Ltd., or Wintech, which serves as its non-exclusive sales representative in Asia other than Japan, and directly to one ODM customer, Chicony Electronics Co., Ltd., or Chicony. Termination of the relationships with these customers could result in a temporary or permanent loss of revenue. Furthermore, any credit issues from these customers could impair their abilities to make timely payment to the Company. See Note 16 for additional information regarding revenue and credit concentration with these customers.

Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash, cash equivalents, marketable debt securities and accounts receivable. The Company maintains its cash primarily in checking accounts with reputable financial institutions. Cash deposits held with these financial institutions may exceed the amount of insurance provided on such deposits. The Company has not experienced any losses on deposits of its cash. In order to limit the exposure of each investment, the cash equivalents and marketable debt securities consist primarily of money market funds, asset-backed securities, commercial paper, U.S. government securities and debt securities of corporations which management assesses to be highly liquid. The Company does not hold or issue financial instruments for trading purposes.

The Company performs ongoing credit evaluation of its customers and adjusts credit limits based upon payment history and customers’ credit worthiness. The Company regularly monitors collections and payments from its customers.

Foreign Currency Transactions

The U.S. dollar is the functional currency for the Company and its subsidiaries. Monetary assets and liabilities denominated in non-U.S. currencies are re-measured to U.S. dollars using current exchange rates in effect at the balance sheet date. Nonmonetary assets and liabilities are re-measured to U.S. dollars using historical exchange rates. Monetary and other accounts are re-measured to U.S. dollars using average exchange rates in effect during each period. Gains or losses from foreign currency re-measurement are included in other income, net in the consolidated statements of operations, and, to date, have not been material.

Fair Value of Financial Instruments

Fair value accounting is applied to all financial assets and liabilities and non-financial assets and liabilities that are recognized or disclosed in the financial statements on a recurring basis. The carrying amounts reflected in the consolidated balance sheets for cash equivalents, accounts receivable, accounts payable, accrued liabilities and other current liabilities, approximate fair value due to the short-term nature.

Cash Equivalents and Marketable Debt Securities

The Company considers all highly liquid debt security investments with original maturities of less than three months at the time of purchase to be cash equivalents. Debt security investments that are highly liquid with original maturities at the time of purchase greater than three months are considered marketable debt securities. The Company classifies these investments as “available-for-sale” (AFS) securities.

The Company adopted Accounting Standards Update (ASU) No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments in fiscal year 2021. As a result, the Company estimates the expected losses whenever a security’s fair value is below its amortized cost basis. The expected loss is computed at an individual security level using the discounted cash flow method with the effective interest rate on the purchase date. In the determination of credit-related losses, the Company excludes securities with zero loss expectation such as assets backed by government agencies. There are various factors considered in its assessment of credit-related losses, including the extent to which the fair value is less than the amortized cost basis, adverse conditions related to an industry or an underlying loan obligator, the payment structure of the security, changes to the rating of the security and other factors that may affect the security credit. The credit-related portion of the loss is recognized in other income, net in the consolidated statements of operations but is limited to the difference between the fair value and the amortized cost basis of the security, adjusted for accrued interest. The non-credit-related portion of the loss is recognized in accumulated other comprehensive income in the consolidated balance sheets. By the end of the third quarter of fiscal year 2022, the Company fully liquidated all of its investments in debt securities and realized all of the gains and losses in the consolidated statements of operations.

The Company measures the fair value of money market funds using quoted prices in active markets for identical assets and classifies them within Level 1. The fair value of the Company’s investments in other debt securities are obtained based on quoted prices for similar asserts in active markets, or model driven valuations using significant inputs derived from or corroborated by observable market data and are classified within Level 2. The Company does not have debt securities under unobservable inputs and classified within Level 3.

Restricted Cash

Amounts included in restricted cash represent those required to be set aside to secure certain transactions in a foreign entity. As of January 31, 2022 and 2021, the restricted cash was immaterial, respectively. The following table presents cash, cash equivalents and restricted cash reported on the consolidated balance sheets, and the sums are presented on the consolidated statements of cash flows:

	As of January 31,
	2022		2021		2020
	(in thousands)
Cash and cash equivalents	$	171,043	$	241,274	$	231,403
Restricted cash		10		10		9
Total as presented in the consolidated statements of cash flows	$	171,053	$	241,284	$	231,412

Trade Accounts Receivable and Allowance for Credit Losses

The Company’s accounts receivables are recorded at invoiced amounts less allowance for any credit losses. According to ASU 2016-13, the Company recognizes credit losses based on a forward-looking current expected credit losses (CECL). The Company makes estimates of expected credit losses based upon its assessment of various factors, including historical collection experience, the age of accounts receivable balances, credit quality of its customers, current economic conditions, reasonable and supportable forecasts of future economic conditions, and other factors that may affect its ability to collect from customers. The changes in allowance for credit losses are recognized in the consolidated statement of operations. The uncollectible accounts receivables are written off in the period in which a determination is made that all commercially reasonable means of recovering them have been exhausted. There were no material write-offs of accounts receivable for the fiscal years ended January 31, 2022, 2021 and 2020, respectively. There were no material current expected credit losses recorded as of January 31, 2022 and 2021, respectively.

Inventories

The Company records inventories at the lower of cost or net realizable value. The cost includes materials and other production costs and is computed using standard cost on a first-in, first-out basis. Inventory reserves are recorded for estimated obsolescence or unmarketable inventories based on forecast of future demand and market conditions. Any adjustments to reduce the cost of inventories to their net realizable value are recognized in earnings in the current period. Once inventory is written down, a new accounting cost basis is established and, accordingly, any associated reserve is not released until the inventory is sold or scrapped. There were no material inventory losses recognized for the fiscal years ended January 31, 2022, 2021 and 2020, respectively.

Property and Equipment

Property and equipment are stated at cost and depreciated using the straight-line method over the estimated useful life for computer equipment, computer software, machinery, equipment and furniture and fixtures. Leasehold improvements are amortized over the shorter of the lease term or their estimated useful lives. Repairs and maintenance are charged to expense as incurred.

Intangible Assets

The Company’s intangible assets primarily consist of acquired intangible assets including developed technology, in-process research and development, or IPR&D, customer relationships, trade name as well as software licenses. The acquired intangible assets are amortized over their estimated useful lives.

The IPR&D is initially capitalized at fair value with an indefinite life and amortization commences upon completion of the underlying projects. When a project underlying reported IPR&D is completed, the corresponding amount of IPR&D is reclassified as an amortizable purchased intangible asset and is amortized over its estimated useful life.

The Company accounts for a noncancelable on premise internal-use software license as the acquisition of an intangible asset and the incurrence of a liability to the extent that all or a portion of the software licensing fees are not paid on or before the license acquisition date. The intangible asset and related liability are recorded at net present value and interest expense is recorded over the payment term. The software license is amortized over its license term.

The Company expenses the cost of purchased software that is to be sold, leased or otherwise marketed as part of a product until the technological feasibility of the product has been established or where the software has an alternative future use. Once the technological feasibility of the product, to be externally marketed, has been established or where the software has an alternative future use, the Company capitalizes the cost of purchased software until the associated product is available for general release to customers, at which point the capitalized cost is amortized on a product-by-product basis over the remaining estimated economic life of the product.

Leases

The Company adopted Accounting Standards Codification (ASC) Topic 842, Leases in fiscal year 2020. As a result, the Company recognizes leases as operating lease right-of-use (“ROU”) assets and corresponding lease liabilities at the lease commencement date based on the present value of future lease payments, while recognizing lease expenses under straight-line method through the lease term. The Company also elected the practical expedient that does not recognize ROU assets and lease liabilities that arise from short-term (12 months or less) leases. The Company does not combine lease components with non-lease components, and as a result, the non-lease components are accounted for separately. In determining the present value of lease payments, the Company uses the implicit interest rate if readily determinable. When the implicit rate is not readily determinable, the Company uses its incremental borrowing rate based on the information available at the lease commencement date. The Company's leases mainly include its worldwide office facilities which are all classified as operating leases. Certain leases include renewal options that are under the Company's discretion. The renewal options are included in the ROU asset and liability calculation if it is reasonably certain that the Company will exercise the option. The Company's finance leases were immaterial as of January 31, 2022 and 2021, respectively.

Business Combination

In the application of purchase accounting in a business combination, the Company allocates the purchase price to the assets acquired and liabilities assumed based on their estimated fair values. The excess of the purchase price over the fair values of the identifiable assets and liabilities is recorded as goodwill. The Company identifies an acquired intangible asset apart from goodwill whenever the intangible asset arises from contractual or other legal rights, or when it can be separately sold, transferred, licensed, rented or exchanged. Intangible assets consist primarily of developed technology, customer relationships and trade name. When determining the fair values of assets acquired and liabilities assumed, especially with respect to the intangible assets, the Company is required to make significant estimates and assumptions. Critical estimates and assumptions used in valuation techniques include, but are not limited to, revenue growth, technology migration curve, customer attrition rate, royalty rates and risk-adjusted discount rates. The estimates are based on historical data, various internal estimates, and external sources that the Company believes to be reasonable upon the acquisition date. Actual results could differ from these estimates under different assumptions or circumstances and such differences could be material.

Goodwill

The Company does not amortize goodwill. The Company tests goodwill for impairment at least annually in the fourth fiscal quarter, or sooner whenever events or changes in circumstances indicate that the asset may be impaired. There is only one single reporting unit for goodwill impairment test purposes based on the Company’s business and reporting structure. The Company is permitted to first assess qualitative factors to determine whether the two step goodwill impairment test is necessary. Further testing is only required if the Company determines, based on the qualitative assessment, that it is more likely than not that the reporting unit’s fair value is less than its carrying amount. Otherwise, no further impairment testing is required. Qualitative factors include industry and market considerations, overall financial performance, and other relevant events and factors affecting the reporting unit. No goodwill impairment has been identified to date based on the Company’s qualitative factors assessment.

Impairment of Long-Lived Assets Excluding Goodwill

The Company reviews property and equipment and intangible assets, excluding goodwill, for impairment at least annually in the fourth fiscal quarter or whenever events or changes in circumstances indicate that the carrying amount of an asset, or asset group, may not be recoverable. Determination of recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset, or asset group to estimated undiscounted future cash flows expected to be generated by the asset, or asset group. If the carrying amount of an asset or asset group exceeds its estimated undiscounted future cash flows, an impairment charge is recognized for the amount by which the carrying amount of the asset or asset group exceeds the estimated fair value of the asset or asset group. Fair value is determined based on the estimated discounted future cash flows expected to be generated by the asset or asset group. Events or changes in circumstances that may indicate that an asset is impaired include significant decreases in the market value of an asset, significant underperformance relative to expected historical or projected future results of operations, a change in the extent or manner in which an asset is utilized, significant declines in the estimated fair value of the overall Company for a sustained period, shifts in technology, loss of key management or personnel, changes in the Company’s operating model or strategy and competitive forces. There has been no occurrence of events to date that would trigger an impairment analysis. As such, no impairment charge has been recognized as of January 31, 2022.

Equity Investment

The Company accounts for its investment in a privately held company as an equity investment and reports the investment in other non-current assets in the consolidated balance sheets. The Company chooses to measure this equity investment that does not have readily determinable fair value at cost minus any recorded impairments, adjusted for observable price changes in transactions for an identical or similar investment of the same issuer. Upon determining that an impairment or observable price change exists, the Company records any adjustment to the fair value of the investment through net income. To date, there have been no identified events or changes in circumstances that may have a significant effect on the fair value of this investment and the Company has not recognized any impairment losses related to this investment nor have there been any observable price changes.

Revenue Recognition

In accordance with ASC 606, Revenue from Contracts with Customers, the Company recognizes revenue when control of its goods and services is transferred to its customers. Revenue recognition is evaluated through the following five steps: (i) identification of the contract, or contracts, with a customer; (ii) identification of the performance obligations in the contract; (iii) determination of the transaction price; (iv) allocation of the transaction price to the performance obligations in the contract; and (v) recognition of revenue when or as a performance obligation is satisfied.

The sale of semiconductor products accounts for the substantial majority of the Company’s consolidated revenue. Sales agreements with customers are renewable periodically and contain terms and conditions with respect to payment, delivery, warranty, supply and other rights. The Company considers an accepted customer purchase order, governed by sales agreement, to be the contract with the customer. For each contract, the Company considers the promise to transfer tangible products to be the identified performance obligation. Product sales contracts may include volume-based tiered pricing or rebates that are fulfilled in cash or product. In determining the transaction price, the Company accounts for the right of returns, cash rebates, commissions and other pricing adjustments as variable consideration, estimates these amounts based on the expected amount to be provided to customers and reduces the revenue recognized. The Company estimates sales returns and rebates based on the Company’s historical patterns of return and pricing credits. As the Company’s standard payment terms are 30 days to 60 days, the contracts have no financing component. Under ASC 606, the Company estimates the total consideration to be received by using the expected value method for each contract, computes weighted average selling price for each unit shipped in cases where there is a material right due to the presence of volume-based tiered pricing, allocates the total consideration between the identified performance obligations, and recognizes revenue when control of its goods and services is transferred to its customers. The Company considers product control to be transferred at a point in time upon shipment or delivery because the Company has a present right to payment at that time, the customer has legal title to the asset, the Company has transferred physical possession of the asset, and the customer has significant risk and rewards of ownership of the asset.

The Company also enters into fixed-price engineering service agreements with certain customers. These agreements may include multiple performance obligations, such as software development services, licensing of intellectual property and post-contract customer support, or PCS. These multiple performance obligations are highly interdependent, highly interrelated, are typically not sold separately and do not have standalone selling prices. They are all inputs to generate one combined output which is incorporating the Company’s SoC into the customer’s product. Accordingly, the Company determines that they are not separately identifiable and shall be treated as a single performance obligation. Customers usually pay based on milestones achieved. Because payments received do not correspond directly with the value of the Company’s performance to date, for fixed-price engineering services arrangements, revenue is recognized using the time-based straight line method, which best depicts the Company’s performance toward complete satisfaction of the performance obligation based on the nature of such professional services. Revenues from engineering service agreements were not material for the fiscal years ended January 31, 2022, 2021 and 2020, respectively.

Timing of revenue recognition may differ from the timing of invoicing to the Company’s customers. The Company records contract assets when revenue is recognized prior to invoicing. The Company’s contract assets are primarily related to satisfied but unbilled performance obligations associated with its engineering service agreements at the reporting date. As of January 31, 2022 and 2021, the contract assets for these unbilled receivables were not material, respectively. The Company’s contract liabilities consist of deferred revenue. The deferred revenue is primarily related to the portion of a transaction price that exceeds the weighted average selling price for products sold to date under tiered-pricing contracts which contain material rights, as well as the nonrecurring engineering charges that are either invoiced or paid but performance obligations are not satisfied associated with engineering service agreements. This deferred revenue is expected to be recognized over the course of the contract when products are delivered for future pricing below the weighted average selling price of the contract or over the period when performance obligations are satisfied. For the fiscal years ended January 31, 2022, 2021 and 2020, the Company did not recognize any material revenue adjustment, respectively, related to performance obligations satisfied in prior periods released from this deferred revenue. As of January 31, 2022 and 2021, the respective deferred revenues were not material. Additionally, the transaction price allocated to unsatisfied, or partially unsatisfied, purchase orders for contracts that are greater than a year was not material as of January 31, 2022 and 2021, respectively. The Company also elects not to disclose the value of unsatisfied or partially unsatisfied performance obligations due to an original expected contract duration of one year or less and elects to exclude amounts collected from customers for all sales taxes from the transaction price.

Cost of Revenue

Cost of revenue includes the cost of materials, such as wafers processed by third-party foundries, costs associated with packaging, assembly and testing, and our manufacturing support operations, such as logistics, planning and quality assurance. Cost of revenue also includes indirect costs, such as warranty, inventory valuation reserves, amortization of developed technology and other general overhead costs.

Research and Development

Research and development costs are expensed as incurred and consist primarily of personnel costs, product development costs, which include engineering services, development software and hardware tools, license fees, costs of fabrication of masks for prototype products, other development materials costs, depreciation of equipment and tools and allocation of facility costs, net of any research and development grants. As of January 31, 2022, there was approximately $1.3 million of grants recorded in prepaid expenses and other current assets and approximately $0.6 million of grants recorded in other non-current assets in the consolidated balance sheets.

Selling, General and Administrative

Selling, general and administrative expenses consist of personnel costs, travel and trade show costs, legal expenses, amortization of trade name and customer relationships, professional services and occupancy costs. Advertising expenses were not material for the fiscal years ended January 31, 2022, 2021 and 2020, respectively.

Stock-Based Compensation

The Company measures stock-based compensation for equity awards granted to employees and directors based on the estimated fair value on the grant date, and recognizes that compensation as expense using the straight-line attribution method for service condition awards or using the graded-vesting attribution method for awards with performance conditions over the requisite service period, which is typically the vesting period of each award. The Company determines the fair value of restricted stock and restricted stock units with service or performance conditions based on the fair market value of its ordinary shares on the grant date. The Company uses the Black-Scholes option pricing model to determine the fair value of stock options. Determining the fair value of stock options on the grant date requires the input of various assumptions, including stock price of the underlying ordinary share, the exercise price of the stock option, expected volatility, expected term, risk-free interest rate and dividend rate. The Company calculates expected volatility based on its own historical stock price for a period commensurate with the expected term, which is computed based on its own historical exercise behavior. The risk-free interest rate is derived from an average of the U.S. Treasury constant maturity rates for the respective periods most closely commensurate with the expected term. The expected dividend yield is zero because the Company has not historically paid dividends and has no present intention to pay dividends. The Company uses the Lattice pricing model and Monte Carlo Simulations to evaluate the fair value of awards with market conditions, including assumptions of historical volatility and risk-free interest rate commensurate with the vesting term. The Company elects to account for forfeitures as they occur.

Income Taxes

The Company records income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in its financial statements or tax returns. In estimating future tax consequences, generally all expected future events other than enactments or changes in the tax law or rates are considered. Valuation allowances are provided when necessary to reduce deferred tax assets to the amount expected to be realized.

The Company applies authoritative guidance for the accounting for uncertainty in income taxes. The guidance requires that tax effects of a position be recognized only if it is “more likely than not” to be sustained based solely on its technical merits as of the reporting date. Upon estimating its tax positions and tax benefits, the Company considers and evaluates numerous factors, which may require periodic adjustments and which may not reflect the final tax liabilities. The Company adjusts its financial statements to reflect only those tax positions that are more likely than not to be sustained under examination.

As part of the process of preparing consolidated financial statements, the Company is required to estimate its taxes in each of the jurisdictions in which it operates. The Company estimates actual current tax exposure together with assessing temporary differences resulting from differing treatment of items, such as accruals and allowances not currently deductible for tax purposes. These differences result in deferred tax assets, which are included in the consolidated balance sheets. In general, deferred tax assets represent future tax benefits to be received when certain expenses previously recognized in the consolidated statements of operations become deductible expenses under applicable income tax laws, or loss or credit carryforwards are utilized.

In assessing whether deferred tax assets may be realized, the Company considers whether it is more likely than not that some portion or all of deferred tax assets will be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income.

The Company makes estimates and judgments about its future taxable income based on assumptions that are consistent with its plans and estimates. Should the actual amounts differ from estimates, the amount of valuation allowance could be materially impacted. Any adjustment to the deferred tax asset valuation allowance would be recorded in the consolidated statements of operations for the periods in which the adjustment is determined to be required.

Net Income (Loss) Per Ordinary Share

Basic earnings (losses) per share is computed by dividing net income (loss) available to ordinary shareholders by the weighted-average number of ordinary shares outstanding during the period. Diluted earnings (losses) per share is computed by dividing net income (loss) available to ordinary shareholders by the weighted-average number of ordinary shares outstanding during the period increased to include the number of additional ordinary shares that would have been outstanding if the potentially dilutive securities had been issued. Potentially dilutive securities include outstanding stock options, shares to be purchased under the Company’s employee stock purchase plan, unvested restricted stock and restricted stock units. The dilutive effect of potentially dilutive securities is reflected in diluted earnings (losses) per share by application of the treasury stock method.

Comprehensive Income (Loss)

Comprehensive income (loss) includes unrealized gains or losses from available-for-sale securities that are excluded from net income (loss).

Recent Accounting Pronouncements

Although there are several new accounting pronouncements issued by the FASB in fiscal year 2022, the Company does not believe any of these accounting pronouncements had or will have a material impact on its consolidated financial statements.

Business Combination

12 Months Ended

Jan. 31, 2022

Business Combinations [Abstract]

Business Combination

2. Business Combination

On November 5, 2021, pursuant to a merger agreement, the Company completed the 100% voting rights acquisition of Oculii Corp., or Oculii, a privately-held Ohio-based company that develops adaptive radar perception algorithms for automotive, including advanced driver assistance systems, autonomous vehicle driving systems and other commercial applications, for a total purchase consideration of $355.7 million. As a result, there was $277.0 million attributed to goodwill, $32.8 million attributed to intangible assets and $45.9 million attributed to net assets acquired. The Company also assumed all of the unvested options to purchase Oculii capital stock that were held by continuing Oculii service providers, subject to customary adjustments with respect to the exercise price and number of shares underlying such options. The acquisition-related costs included in selling, general and administrative expense in the consolidated statements of operations were approximately $3.8 million in fiscal year 2022.

The aggregate purchase consideration has been allocated as follow:

	Amount
	(in thousands)
Cash consideration transferred	$	355,071
Net working capital adjustment		247
Fair value of stock-based compensation awards attributable to pre-combination services		407
Total purchase consideration	$	355,725

The following table sets forth the fair values of the assets acquired and liabilities assumed in connection with the acquisition:

	Acquisition Date
	Fair Value
	(in thousands)
Cash and cash equivalents	$	48,032
Accounts receivable		733
Inventories		194
Prepaid expenses and other current assets		134
Property and equipment		155
Intangible assets		32,800
Goodwill		277,024
Other non-current assets		34
Total assets acquired		359,106
Accounts payable		223
Accrued and other current liabilities		2,193
Deferred income tax liability, non-current		965
Total liabilities assumed		3,381
Total purchase consideration	$	355,725

The purchase price allocation is subject to change during the measurement period, which is not to exceed one year from the acquisition date. At this time, the Company does not expect material changes to the assets acquired or liabilities assumed. Goodwill is primarily attributable to expected synergies for the combined operations and the assembled workforce acquired and is assigned to the Company’s sole reportable segment.

Below is a summary of intangible assets acquired in the acquisition:

	Acquisition Date		Estimated
	Fair Value		Useful Lives
	(in thousands)
Trade name (1)	$	2,500	7 years
Customer relationships (2)		13,200	9 years
Developed technology (1)		17,100	7 years
Total intangible assets acquired	$	32,800

_____________

(1)	The fair values of trade name and developed technology were determined by applying the Relief-from-Royalty Method under the income approach.

(2)	Customer relationships represent the fair value of the existing relationships using the Multi-Period Excess Earnings Method.

The finite-lived intangible assets will be amortized over the estimated useful lives based on the pattern in which the economic benefits are expected to be received to the cost of revenue and operating expenses and have a weighted average useful life of 7.8 years.

Pro Forma Information (Unaudited)

The following table presents unaudited pro forma information as if the acquisition of Oculii had occurred on February 1, 2020. The unaudited pro forma information for the periods indicated includes adjustments for non-recurring transaction costs, amortization of intangibles arising from the acquisition, stock-based compensation expense and the related income tax effects. The unaudited pro forma financial information is not necessarily indicative of the results of operations that would have occurred had the acquisition been effected on February 1, 2020. In addition, these results are not intended to be a projection of future results and do not reflect events that may occur after the acquisition, including but not limited to revenue enhancements, cost savings or operating synergies that the combined entity may achieve as a result of the acquisition.

	Pro Forma Year Ended
	January 31, 2022			January 31, 2021
	(unaudited, in thousands)
Revenue	$	333,323		$	223,497
Net loss	$	(35,330	)	$	(78,644	)

Approximately $0.5 million of revenue and $6.1 million of net loss attributable to Oculii since the acquisition date of November 5, 2021 have been included in the consolidated statements of operations for the fiscal year ended January 31, 2022.

Financial Instruments and Fair Value

12 Months Ended

Jan. 31, 2022

Investments All Other Investments [Abstract]

Financial Instruments and Fair Value

3. Financial Instruments and Fair Value

The Company invests a portion of its cash in debt securities that are denominated in United States dollars. The investment portfolio consists of money market funds, asset-backed securities, commercial paper, U.S. government securities and debt securities of corporations. All of the investments are classified as available-for-sale securities and reported at fair value in the consolidated balance sheets. By the end of the third quarter of fiscal year 2022, the Company fully liquidated all of the investments and reported the remaining cash equivalents as follows:

	As of January 31, 2022
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
Money market funds	$	20	$	—	$	—		$	20
Commercial paper		—		—		—			—
Corporate bonds		—		—		—			—
Asset-backed securities		—		—		—			—
U.S. government securities		—		—		—			—
Total cash equivalents and marketable debt securities	$	20	$	—	$	—		$	20

	As of January 31, 2021
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
Money market funds	$	171	$	—	$	—		$	171
Commercial paper		66,181		—		—			66,181
Corporate bonds		102,108		980		(7	)		103,081
Asset-backed securities		15,740		164		—			15,904
U.S. government securities		29,383		82		—			29,465
Total cash equivalents and marketable debt securities	$	213,583	$	1,226	$	(7	)	$	214,802

	As of
	January 31, 2022		January 31, 2021
	(in thousands)
Included in cash equivalents	$	20	$	15,368
Included in marketable debt securities		—		199,434
Total cash equivalents and marketable debt securities	$	20	$	214,802

The contractual maturities of the investments at January 31, 2022 and 2021 were as follows:

	As of
	January 31, 2022		January 31, 2021
	(in thousands)
Due within one year	$	20	$	135,899
Due within one to three years		—		78,903
Total cash equivalents and marketable debt securities	$	20	$	214,802

The unrealized gains and losses on the available-for-sale securities were primarily caused by fluctuations in market value and interest rates as a result of the economic environment. In accordance with ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, the Company estimates the expected losses at an individual security level whenever a security’s fair value is below its amortized cost basis using the discounted cash flow method. The credit-related portion of the loss is recognized in other income, net in the consolidated statements of operations but is limited to the difference between the fair value and the amortized cost basis of the security, adjusted for accrued interest. The non-credit-related portion of the loss is recognized in accumulated other comprehensive income in the consolidated balance sheets. The credit-related losses were not material for the fiscal years ended January 31, 2022 and 2021, respectively. As of January 31, 2022, the Company fully liquidated all of its investments in debt securities and realized all of the gains and losses in the consolidated statements of operations.

The following fair value hierarchy is applied for disclosure of the inputs used to measure fair value. This hierarchy prioritizes the inputs into three broad levels as follows:

Level 1—Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.

Level 2—Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments.

Level 3—Unobservable inputs based on the Company’s own assumptions used to measure assets and liabilities at fair value. The inputs require significant management judgment or estimation.

The following tables present the fair value of the financial instruments measured on a recurring basis as of January 31, 2022 and 2021, respectively:

	As of January 31, 2022
	Total		Level 1		Level 2		Level 3
	(in thousands)
Money market funds	$	20	$	20	$	—	$	—
Commercial paper		—		—		—		—
Corporate bonds		—		—		—		—
Asset-backed securities		—		—		—		—
U.S. government securities		—		—		—		—
Total cash equivalents and marketable debt securities	$	20	$	20	$	—	$	—

	As of January 31, 2021
	Total		Level 1		Level 2		Level 3
	(in thousands)
Money market funds	$	171	$	171	$	—	$	—
Commercial paper		66,181		—		66,181		—
Corporate bonds		103,081		—		103,081		—
Asset-backed securities		15,904		—		15,904		—
U.S. government securities		29,465		—		29,465		—
Total cash equivalents and marketable debt securities	$	214,802	$	171	$	214,631	$	—

Inventories

12 Months Ended

Jan. 31, 2022

Inventory Disclosure [Abstract]

Inventories

4. Inventories

Inventories at January 31, 2022 and 2021 consisted of the following:

	As of January 31,
	2022		2021
	(in thousands)
Work-in-progress	$	25,844	$	18,219
Finished goods		19,375		7,862
Total	$	45,219	$	26,081

Property and Equipment, Net

12 Months Ended

Jan. 31, 2022

Property Plant And Equipment [Abstract]

Property and Equipment, Net

5. Property and Equipment, net

Depreciation expense was approximately $2.8 million, $2.6 million and $2.8 million for the fiscal years ended January 31, 2022, 2021 and 2020, respectively. Property and equipment at January 31, 2022 and 2021 consisted of the following:

	As of January 31,
	2022			2021
	(in thousands)
Computer equipment and software	$	16,488		$	11,525
Machinery and equipment		7,532			6,946
Furniture and fixtures		1,243			969
Leasehold improvements		2,942			2,237
Construction in progress		1,060			331
		29,265			22,008
Less: accumulated depreciation and amortization		(19,131	)		(16,478	)
Total property and equipment, net	$	10,134		$	5,530

Intangible Assets, Net

12 Months Ended

Jan. 31, 2022

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets, Net

6. Intangible Assets, net

As of January 31, 2022, the intangible assets primarily consist of intangible assets acquired from Oculii, including developed technology, customer relationships and trade name. The intangible assets also include IPR&D reclassified from an indefinite-lived asset to a finite-lived asset and software licenses. In the third quarter of fiscal year 2022, the Company determined that the underlying project incorporating the IPR&D from the prior acquisition of VisLab S.r.l., or VisLab, was completed. As a result, the $4.1 million of IPR&D was reclassified as definite-lived developed technology and started amortization over its estimated economic life of 7 years.

The Company enters into certain software license agreements with third parties from time-to-time. The software licenses consist of noncancelable on premise internal-use software and software with alternative use that is to be sold, leased or otherwise marketed as part of a product. The licenses have been capitalized as intangible assets, and the corresponding future payments have been recorded as liabilities at net present value. As of January 31, 2022, $6.0 million was recorded in accrued and other current liabilities and $1.7 million was recorded in other long-term liabilities in the consolidated balance sheets.

The components of intangible assets as of January 31, 2022 and 2021 were as follows:

	As of January 31, 2022							As of January 31, 2021
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	(in thousands)
In-process research and development	$	—	$	—		$	—	$	4,100	$	—		$	4,100
Developed technology		21,200		(904	)		20,296		—		—			—
Customer relationships		13,200		(367	)		12,833		—		—			—
Trade name		2,500		(89	)		2,411		—		—			—
Software licenses		22,093		(11,331	)		10,762		21,043		(6,440	)		14,603
Total intangible assets, net	$	58,993	$	(12,691	)	$	46,302	$	25,143	$	(6,440	)	$	18,703

During the twelve months ended January 31, 2022, there was approximately $1.5 million of software licenses retired. The amortization expense associated with these intangible assets was approximately $7.8 million, $6.5 million, and $5.9 million for the fiscal years ended January 31, 2022, 2021 and 2020 respectively. The expected annual amortization expense related to these intangible assets as of January 31, 2022 is as follows:

	As of
	January 31, 2022
Fiscal Year	(in thousands)
2023	$	11,927
2024		8,176
2025		5,216
2026		4,853
2027		4,852
Thereafter		11,278
Total future amortization expenses:	$	46,302

The Company is required to test the impairment prior to changing the IPR&D from an indefinite-lived asset to a finite-lived asset. There were no intangible asset impairments for the fiscal years ended January 31, 2022, 2021 and 2020, respectively.

Goodwill

12 Months Ended

Jan. 31, 2022

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill

7. Goodwill

The Company has one reportable segment as discussed in Note 16 of the Notes to Consolidated Financial Statements. Accordingly, there is no goodwill assignment based on reporting units. As of January 31, 2022 and 2021, the total carrying amount of goodwill was $303.6 million and $26.6 million, respectively. The increased $277.0 million of goodwill is attributable to the Oculii acquisition in fiscal year 2022. The Company does not amortize goodwill. During the fourth quarters of fiscal year 2022, 2021 and 2020, the Company performed annual goodwill tests and there were no goodwill impairments for the fiscal years ended January 31, 2022, 2021 and 2020, respectively.

Accrued and Other Current Liabilities

12 Months Ended

Jan. 31, 2022

Payables And Accruals [Abstract]

Accrued and Other Current Liabilities

8. Accrued and Other Current Liabilities

Accrued and other current liabilities at January 31, 2022 and 2021 consisted of the following:

	As of January 31,
	2022		2021
	(in thousands)
Accrued employee compensation	$	30,044	$	18,105
Accrued product development costs		10,523		21,157
Software license liabilities, current		6,001		5,582
Other accrued liabilities		5,496		3,282
Total accrued and other current liabilities	$	52,064	$	48,126

The timing of SoC development progress and payments to outside foundries resulted in fluctuation in the accrued product development costs.

Leases

12 Months Ended

Jan. 31, 2022

Leases [Abstract]

Leases

9. Leases

The Company has entered into various operating leases for its worldwide office facilities. During the twelve months ended January 31, 2022, the Company extended its existing Shanghai office lease for an additional three years beginning December 1, 2021 to November 30, 2024 and extended its existing Hong Kong office lease for an additional five years beginning December 1, 2021 to November 30, 2026. The Company also leased an additional space for its Shanghai office for a period of 40 months starting from August 1, 2021 through November 30, 2024. The Company recorded an aggregate increase of approximately $4.4 million to the operating lease right-of-use assets and corresponding operating lease liabilities in the consolidated balance sheets as a result of these lease extensions and additional leased space.

In August 2019, VisLab, a wholly-owned subsidiary, was granted a land lease for 35 years with an obligation to construct a building on the land in line with architectural requirements from the lessor in Parma, Italy (“Parma lease”). The Company will be responsible for the costs of construction and will occupy the building after completion of construction for the remainder of the lease term. At the end of the lease, the land together with the building and all of the improvements will revert to the lessor. The Parma lease will be recorded in the balance sheet upon completion of the building construction, which is expected to be in fiscal year 2024. Any payments made prior to completion of construction will be recorded as prepayments of the lease in other non-current assets in the consolidated balance sheets. The prepayments were immaterial as of January 31, 2022. The total estimated future undiscounted cash payments are approximately $2.2 million, of which $1.8 million will be paid in the construction phase and the remaining balance of $0.4 million will be paid over the remainder of the lease term.

For the fiscal years ended January 31, 2022, 2021 and 2020, the operating lease expense was approximately $3.5 million, $3.0 million and $3.0 million, respectively. The Company's short-term leases and finance leases were immaterial as of January 31, 2022.

Supplemental cash flow information related to leases is as follows:

	Year Ended
	January 31, 2022		January 31, 2021
	(in thousands)
Cash paid for operating leases included in operating cash flows	$	3,608	$	2,416
Supplemental non-cash information related to lease liabilities arising from obtaining right-of-use assets	$	365	$	348
Leased assets obtained in exchange for operating lease liabilities arising from lease modifications	$	2,798	$	2,440

As of January 31, 2022, the weighted average remaining lease term is 3.60 years, and the weighted average discount rate is 3.55 percent. Future minimum lease payments for the lease liabilities, excluding the Parma lease described above, are as follows:

	As of
	January 31, 2022
Fiscal Year	(in thousands)
2023	$	3,712
2024		3,482
2025		3,273
2026		1,431
2027		353
Thereafter		129
Total future annual minimum lease payments		12,380
Less: interest		(667	)
Total lease liabilities	$	11,713

Other Long-Term Liabilities

12 Months Ended

Jan. 31, 2022

Other Liabilities Disclosure [Abstract]

Other Long-Term Liabilities

10. Other Long-Term Liabilities

Other long-term liabilities at January 31, 2022 and 2021 consisted of the following:

	As of January 31,
	2022		2021
	(in thousands)
Unrecognized tax benefits, including interest	$	9,313	$	8,966
Deferred tax liabilities, non-current		1,769		1,288
Software license liabilities, non-current		1,674		6,259
Other long-term liabilities		7		299
Total other long-term liabilities	$	12,763	$	16,812

Capital Stock

12 Months Ended

Jan. 31, 2022

Equity [Abstract]

Capital Stock

11. Capital Stock

Preference shares

Since the Company’s initial public offering, or IPO, a total of 20,000,000 preference shares, with a $0.00045 par value per share, were authorized. There were no preference shares issued and outstanding as of January 31, 2022 and 2021, respectively.

Ordinary shares

As of January 31, 2022 and 2021, the following ordinary shares were reserved for future issuance under the Company’s equity plans and employee stock purchase plan:

	As of January 31,
	2022		2021
Shares reserved for options, restricted stock and restricted stock units		7,461,541		5,981,741
Shares reserved for employee stock purchase plan		2,624,704		2,299,143

Shares repurchased

On May 29, 2019, the Company’s Board of Directors authorized a program to repurchase up to $50.0 million of the Company’s ordinary shares commencing immediately through June 30, 2020. On March 16, 2020, the Company repurchased a total of 25,719 shares for approximately $1.0 million in cash. On May 29, 2020, the Board approved an extension of this program for an additional twelve months, ending June 30, 2021. On May 25, 2021, the Board extended the repurchase program for another 12 months through June 30, 2022. Since the inception of the repurchase programs in June 2016, a total of $275.0 million has been authorized and a total of 4,011,595 shares have been repurchased for approximately $175.8 million in cash. Repurchases may be made from time-to-time through open market purchases, 10b5-1 plans or privately negotiated transactions subject to market conditions, applicable legal requirements and other relevant factors. The repurchase program does not obligate the Company to acquire any particular amount of ordinary shares, and it may be suspended at any time at the Company’s discretion. The repurchase program is funded using the Company’s working capital and any repurchased shares are recorded as authorized but unissued shares. As of January 31, 2022, there was $49.0 million available for repurchases under the repurchase program through June 30, 2022.

Employee Benefits and Stock-based Compensation

12 Months Ended

Jan. 31, 2022

Postemployment Benefits [Abstract]

Employee Benefits and Stock-based Compensation

12. Employee Benefits and Stock-based Compensation

401(k) Plan

The Company maintains a defined contribution 401(k) plan (the “401(k) Plan”) for all of its eligible U.S. employees. Under the 401(k) Plan, eligible employees may contribute up to the Internal Revenue Service annual contribution limitation. The Company is responsible for administrative costs of the Plan. The Company’s contribution expense for the fiscal year ended January 31, 2022 was approximately $0.6 million. The Company did not make any matching contributions prior to fiscal year 2022.

Stock Option Plans

2004 Stock Plan. The 2004 Stock Plan provides for the grant of incentive stock options (“ISOs”) within the meaning of Section 422 of the Internal Revenue Code of 1986, as amended (the “Code”), nonstatutory stock options (“NSOs”), stock purchase rights to acquire restricted stock and restricted stock units. Upon the completion of the IPO, no additional awards will be granted under the 2004 Plan and the 2004 Plan was terminated. However, all outstanding stock options and other awards previously granted under the 2004 Plan will remain subject to the terms of the 2004 Plan.

2012 Equity Incentive Plan. The 2012 Equity Incentive Plan, or 2012 EIP, permits the grant of ISOs, within the meaning of Section 422 of the Code, to employees of the Company and any of the Company’s subsidiary corporations, and the grant of NSOs, stock appreciation rights, restricted stock, restricted stock units, performance units, performance shares, deferred stock units and dividend equivalents to employees, directors and consultants of the Company and any of the Company’s subsidiary corporations’ employees and consultants.

2021 Equity Incentive Plan. In June 2021, the Company’s shareholders approved the 2021 Equity Incentive Plan, or 2021 EIP. The 2021 EIP permits the grant of ISOs, within the meaning of Section 422 of the Code, to employees of the Company and any of the Company’s subsidiary or parent corporations, and the grant of NSOs, stock appreciation rights, restricted stock, restricted stock units, and performance awards to employees, directors and consultants of the Company and any of the Company’s subsidiary or parent corporations’ employees and consultants. Upon adoption of the 2021 EIP, the total number of ordinary shares of the Company reserved for issuance under the 2021 Plan was equal to, subject to adjustments upon changes in capitalization as provided under the 2021 EIP, 1,350,000 ordinary shares, plus (i) any ordinary shares subject to outstanding awards granted under the 2012 EIP, that, after the date the 2012 EIP is terminated, are cancelled, expire or otherwise terminate without having been exercised in full or are forfeited to or repurchased by the Company due to failure to vest, and (ii) any ordinary shares that, as of immediately prior to the termination of the 2012 EIP, were available for grant under the 2012 EIP, up to a maximum of 6,834,208 ordinary shares pursuant to clauses (i) and (ii).

In the first quarter of fiscal year 2022 and 2021, the Company added 1,599,634 and 1,521,252 ordinary shares, respectively, to the ordinary shares reserved for issuance, pursuant to an “evergreen” provision contained in the 2012 EIP. Upon the approval of the 2021 EIP, the 2012 EIP was terminated. No additional awards will be granted under the 2012 EIP and any shares that were reserved but not issued under the 2012 EIP became available for future grant or sale under the 2021 EIP. However, all outstanding stock options and other awards previously granted under the 2012 EIP will remain subject to the terms of the 2012 EIP.

Oculii Corp. 2017 Stock Option Plan. In November 2021, the Company assumed the Oculii Corp. 2017 Stock Option Plan, or 2017 Plan, as part of the acquisition of Oculii. No additional awards will be granted under the 2017 Plan. However, all outstanding stock options previously granted under the 2017 Plan will remain subject to the terms of the 2017 Plan and any outstanding stock options that are cancelled or forfeited due to failure to vest will immediately expire from the 2017 Plan.

The exercise price of ISOs granted to a holder of more than 10% of the voting power of all classes of the Company’s shares shall be no less than 110% of fair market value on the grant date. The exercise price of ISOs granted to other employees and NSOs shall be no less than 100% of fair market value on the grant date. Options granted under the Plan have a term of up to 10 years from grant date. Options granted to new employees generally vest 25% on the first anniversary service date of the grant and the remainder vest ratably over the following 36 months.

Restricted stock and restricted stock units granted to new employees generally vest as to 1/4th of the shares on the first anniversary service date of the grant and 1/16th of the shares vest every 3 months thereafter, so as to be 100% vested on the fourth anniversary of the vesting commencement date.

Vesting schedules for other service condition, market condition or performance condition awards vary and are subject to approval by the Board of Directors; provided that the performance condition associated awards shall not vest at all until the performance conditions are achieved and are subject to the award’s holders continuing to provide services to the Company through such vesting dates. The performance condition awards are automatically forfeited in their entirety, without any cost to or action by the Company, if there has been no achievement of the performance. The holders of restricted stock have voting power and other rights with respect to such shares, provided, however, that such shares are held in escrow and subject to forfeiture until the shares vested.

Amended and Restated 2012 Employee Stock Purchase Plan. The Amended and Restated 2012 Employee Stock Purchase Plan, or ESPP, permits eligible participants to purchase ordinary shares at a discount through contributions up to 15% of their eligible compensation, subject to any IRS limitations. The ESPP provides each offering and purchasing period of six months in duration. The purchase price is 85% of the lower of the closing price of the Company’s ordinary shares on the first trading day of each offering period or on the purchase date.

In the first quarter of fiscal year 2022 and 2021, the Company added 444,343 and 422,570 ordinary shares, respectively, to the ordinary shares reserved for issuance, pursuant to an “evergreen” provision contained in the ESPP. Pursuant to such provision, on February 1st of each fiscal year, the number of ordinary shares reserved for issuance under the ESPP is automatically increased by a number equal to the lesser of (i) 1,500,000 ordinary shares, (ii) one and one quarter percent (1.25%) of the aggregate number of ordinary shares outstanding on such date, or (iii) an amount determined by the Company’s Board of Directors or a duly authorized committee of the Board of Directors.

Stock-based Compensation

The following table presents the classification of stock-based compensation for the periods indicated:

	Year Ended January 31,
	2022		2021		2020
	(in thousands)
Stock-based compensation:
Cost of revenue	$	1,489	$	1,328	$	1,184
Research and development		54,787		42,903		41,842
Selling, general and administrative		31,525		25,903		23,845
Total stock-based compensation	$	87,801	$	70,134	$	66,871

For the twelve months ended January 31, 2022, approximately $7.8 million of stock-based compensation expense was accrued in accrued and other current liabilities in the consolidated balance sheets. As of January 31, 2022, total unrecognized compensation cost related to unvested stock options was $27.7 million and is expected to be recognized over a weighted-average period of 2.53 years. Total unrecognized compensation cost related to unvested restricted stock units was $194.4 million and is expected to be recognized over a weighted-average period of 2.32 years. The restricted stock awards were fully vested as of January 31, 2020.

The following table sets forth the weighted-average assumptions used to estimate the fair value of stock options and employee stock purchase plan awards for the periods indicated:

	Year Ended January 31,
	2022			2021			2020
Stock Options:
Volatility		51	%		52	%		52	%
Risk-free interest rate		1.04	%		0.52	%		1.82	%
Expected term (years)		5.06			5.78			6.01
Dividend yield		0	%		0	%		0	%
Employee stock purchase plan awards:
Volatility		57	%		59	%		47	%
Risk-free interest rate		0.06	%		0.21	%		2.23	%
Expected term (years)		0.5			0.5			0.5
Dividend yield		0	%		0	%		0	%

The following table summarizes stock option activities for the periods indicated:

	Option Outstanding
												Weighted-
										Total Intrinsic		Average
						Weighted-		Weighted-		Value of		Remaining		Aggregate
				Weighted-		Average		Average		options		Contractual		Intrinsic
				Average		Grant-date		Acquisition-date		Exercised		Term		Value
	Shares			Exercise Price		Fair Value		Fair Value		(in thousands)		(in years)		(in thousands)
Outstanding at January 31, 2019		1,459,064		$	28.31
Granted		66,850			50.56	$	25.35
Exercised		(366,886	)		15.52					$	13,263
Forfeited		(14,931	)		46.29
Expired		(19,451	)		64.53
Outstanding at January 31, 2020		1,124,646			32.93
Granted		51,200			59.54	$	28.37
Exercised		(421,736	)		24.52					$	19,401
Forfeited		(11,618	)		46.69
Expired		(23,349	)		70.11
Outstanding at January 31, 2021		719,143			38.33
Granted		14,700			110.19	$	50.28
Assumed		163,581			23.10			$	173.04
Exercised		(269,287	)		28.23					$	25,622
Forfeited		(7,669	)		68.95
Expired		(1,146	)		9.86
Outstanding at January 31, 2022		619,322		$	40.08							5.25		$	61,975
Exercisable at January 31, 2022		399,764		$	42.40								3.92	$	39,076

The intrinsic value of options outstanding and exercisable is calculated based on the difference between the fair market value of the Company’s ordinary shares on the reporting date and the exercise price. The closing price of the Company’s stock was $140.15 on January 31, 2022, as reported by The NASDAQ Global Market. The intrinsic value of exercised options is calculated based on the difference between the fair market value of the Company’s stock on the exercise date and the exercise price.

The following table summarizes restricted stock and restricted stock units activities for the periods indicated:

				Weighted-
				Average
				Grant-Date
	Shares			Fair Value
Unvested at January 31, 2019		2,395,516		$	48.49
Granted		1,329,288			54.54
Vested		(1,012,581	)		51.24
Forfeited		(94,957	)		54.26
Unvested at January 31, 2020		2,617,266			50.30
Granted		1,499,203			53.45
Vested		(1,162,883	)		50.53
Forfeited		(81,785	)		54.48
Unvested at January 31, 2021		2,871,801			51.73
Granted		1,213,257			128.80
Vested		(1,367,309	)		53.85
Forfeited		(66,614	)		71.59
Unvested at January 31, 2022		2,651,135		$	85.41

Total fair value as of the respective vesting dates of restricted stock and restricted stock units vested for the fiscal years ended January 31, 2022, 2021 and 2020 was approximately $192.5 million, $69.0 million, and $52.1 million, respectively. As of January 31, 2022, the aggregate intrinsic value of unvested restricted stock units was $371.6 million.

Net Loss Per Ordinary Share

12 Months Ended

Jan. 31, 2022

Earnings Per Share [Abstract]

Net Loss Per Ordinary Share

13. Net Loss Per Ordinary Share

The following table sets forth the computation of basic and diluted net loss per ordinary share for the periods indicated:

	Year Ended January 31,
	2022			2021			2020
	(in thousands, except share and per share data)
Numerator:
Net loss	$	(26,411	)	$	(59,786	)	$	(44,792	)
Denominator:
Weighted-average ordinary shares - basic		36,577,120			34,679,717			33,083,562
Weighted-average ordinary shares - diluted		36,577,120			34,679,717			33,083,562
Net loss per ordinary share:
Basic	$	(0.72	)	$	(1.72	)	$	(1.35	)
Diluted	$	(0.72	)	$	(1.72	)	$	(1.35	)

The following weighted-average potentially dilutive securities were excluded from the computation of diluted net loss per ordinary share as their effect would have been antidilutive:

	Year Ended January 31,
	2022		2021		2020
Options to purchase ordinary shares		327,747		660,025		913,678
Restricted stock and restricted stock units		1,388,091		1,440,176		1,139,269
Employee stock purchase plan		8,904		27,789		8,530
		1,724,742		2,127,990		2,061,477

Income Taxes

12 Months Ended

Jan. 31, 2022

Income Tax Disclosure [Abstract]

Income Taxes

14. Income Taxes

Loss before income taxes consisted of the following for the periods indicated:

	Year Ended January 31,
	2022			2021			2020
	(in thousands)
U.S. operations	$	(5,842	)	$	8		$	845
Non-U.S. operations		(22,799	)		(57,311	)		(42,473	)
Loss before income taxes	$	(28,641	)	$	(57,303	)	$	(41,628	)

Income tax provision (benefit) consisted of the following for the periods indicated:

	Year Ended January 31,
	2022			2021			2020
	(in thousands)
Current:
U.S. federal tax	$	907		$	1,705		$	1,440
U.S. state taxes		—			256			3
Non-U.S. foreign taxes		1,778			1,019			1,540
		2,685			2,980			2,983
Deferred:
U.S. federal tax		(4,819	)		(432	)		182
U.S. state taxes		(14	)		—			—
Non-U.S. foreign taxes		(82	)		(65	)		(1	)
		(4,915	)		(497	)		181
Provision (benefit) for income taxes	$	(2,230	)	$	2,483		$	3,164

The Company consists of a Cayman Islands parent company with various foreign and U.S. Subsidiaries. Effective December 31, 2019, the Company has structured its activities to comply with the International Tax Co-Operation (Economic Substance) Law, 2018 in the Cayman Islands. As part of the new structure, the Company is the general partner of a Canadian limited partnership, the ultimate beneficial owner, and is allocated all of the earnings of the partnership. The primary jurisdiction where our foreign earnings are derived is the Cayman Islands, where the Company is domiciled. Under the current laws of the Cayman Islands, the Company is not subject to tax on its income. For purposes of the reconciliation between the provision (benefit) for income taxes at the statutory rate and the effective tax rate, a notional U.S. 21% rate is applied to pretax income (loss) as a result of the following for the periods indicated, respectively:

	Year Ended January 31,
	2022			2021			2020
	(in thousands)
Provision at U.S. notional statutory rate	$	(6,015	)	$	(12,034	)	$	(8,742	)
U.S. state taxes		(11	)		212			3
Non-U.S. foreign tax differential		6,483			12,989			10,458
Stock-based compensation		1,900			4,943			4,172
U.S. R&D credit		(5,886	)		(3,928	)		(3,109	)
Valuation allowance		765			—			—
FIN48 interest		311			—			—
Other		223			301			382
Provision (benefit) for income taxes	$	(2,230	)	$	2,483		$	3,164

Temporary differences that gave rise to significant portions of the Company’s deferred tax assets and liabilities at January 31, 2022 and 2021 were as follows:

	As of January 31,
	2022			2021
	(in thousands)
Deferred tax assets:
Federal and state credits	$	33,485		$	24,394
Net operating losses		7,466			—
Expenses not currently deductible		1,294			939
Operating lease liabilities		2,096			2,144
Stock-based compensation		3,632			3,349
Foreign deferred		191			184
Gross deferred tax assets		48,164			31,010
Valuation allowance		(24,083	)		(17,962	)
Total deferred tax assets	$	24,081		$	13,048
Deferred tax liabilities
Intangible assets		(8,150	)		—
Property and equipment		(386	)		(1,443	)
Operating lease assets		(1,971	)		(1,978	)
Net deferred tax assets	$	13,574		$	9,627

Tax valuation allowance for the periods indicated below were as follows:

							Deductions
					Additions		Charged to
	Balance at		Additional		Charged to		Expenses		Balance at
	Beginning of		Charged to		Other		or Other		End of
	Period		Expenses		Account		Accounts		Period
	(in thousands)
Tax Valuation Allowance
Year ended January 31, 2022	$	17,962		4,874		1,247			$	24,083
Year ended January 31, 2021	$	14,670		3,292		—		—	$	17,962
Year ended January 31, 2020	$	12,526		2,144		—		—	$	14,670

The Company conducts its business in several countries and regions and is subject to taxation in those jurisdictions. The Company is incorporated in the Cayman Islands with foreign subsidiaries in the U.S., China, Taiwan, Italy and other foreign countries and regions. As such, the Company’s worldwide operating income is subject to varying tax rates and its effective tax rate is highly dependent upon the geographic distribution of its earnings or losses and the tax laws and regulations in each geographical region. Consequently, the Company has experienced lower effective tax rates as a substantial amount of its operations are conducted in lower-tax jurisdictions. If the Company’s operational structure was to change in such a manner that would increase the amount of operating income subject to taxation in higher-tax jurisdictions, or if the Company was to commence operations in jurisdictions assessing relatively higher tax rates, its effective tax rate could fluctuate significantly on a quarterly basis and/or be adversely affected. Dividend distributions received from the Company’s U.S. subsidiary and certain other foreign subsidiaries may be subject to local country withholding taxes when, and if, distributed. Deferred tax liabilities have not been recorded on unremitted earnings of certain subsidiaries because management’s intent is to indefinitely reinvest any undistributed earnings in those subsidiaries. If dividend distributions from those subsidiaries were to occur, the liability as of January 31, 2022 would be $14.4 million. Cumulative undistributed earnings of foreign subsidiaries for which no deferred taxes have been provided approximated $97.7 million at January 31, 2022.

As of January 31, 2022 and 2021, the Company had deferred tax assets (net of deferred tax liabilities) before valuation allowance, of $37.7 million and $27.6 million, respectively. The Company assesses whether a valuation allowance should be established against its deferred tax assets based on the consideration of all available evidence, using a “more likely than not” standard.

The Company has Federal and California net operating losses of $34.1 million and $7.0 million, respectively, as of January 31, 2022. The California net operating loss carryforwards begin to expire in fiscal year 2036, if not utilized. For financial statement purposes these carry forwards are offset by uncertain tax positions.

The Company also has Federal and California state research and development credit carryforwards of approximately $28.1 million and $33.0 million, respectively, at January 31, 2022. The Federal credits begin to expire in fiscal year 2035. The California credits can be carried forward indefinitely.

The Company reports its U.S. state deferred tax assets and related valuation allowance, net of the U.S federal tax rate of 21%. As of January 31, 2022, the Company has recorded a valuation allowance of $22.1 million against all of its U.S. state deferred tax assets due to uncertainty regarding the future utilization of these deferred tax assets. In addition, the Company has recorded a valuation allowance against the federal deferred tax assets of Oculii Corp.

Utilization of the net operating loss and research credit carryforwards may be subject to an annual limitation due to the ownership percentage change limitations as defined by the U.S. Internal Revenue Code Section 382, as amended, and similar state provisions. The annual limitation may result in the expiration of the U.S. Federal and state research credit carryforwards before utilization. The Company does not expect any net operating loss or tax credit carryforwards to expire as a result of a Section 382 limitation.

The Company applies the provisions of FASB’s guidance on accounting for uncertainty in income taxes. As of January 31, 2022, the Company had approximately $30.9 million in unrecognized tax benefits, $24.4 million of which would affect the Company’s effective tax rate if recognized. The remainder of the unrecognized tax benefits would not affect the effective tax rate due to the full valuation recorded for state deferred tax assets. Certain fiscal year 2021 amounts have been revised to reflect unrecognized tax benefits on a gross basis. The following table sets forth a reconciliation of the beginning and ending amount of unrecognized tax benefits:

	Year Ended January 31,
	2022			2021			2020
	(in thousands)
Beginning balance:	$	29,527		$	42,695		$	37,531
Additions based on tax positions related to the current year		1,412			3,360			4,964
Additions for tax positions of prior years		55			16			252
Reductions for tax positions in prior years		—			(10,212	)		—
Settlements for prior periods		—			(6,087	)		—
Lapse of applicable statute of limitations		(110	)		(245	)		(52	)
Ending balance:	$	30,884		$	29,527		$	42,695

The Company classified $8.0 million and $7.9 million of income tax liabilities as other long-term liabilities as of January 31, 2022 and 2021, respectively, because payment of cash or settlement is not anticipated within one year from the balance sheet date.

The Company recognizes interest and penalties related to uncertain tax positions as a component of income tax expense. The Company recorded $303,000 and $283,000 and $358,000 of interest expense and penalties related to uncertain tax positions for the fiscal years ended January 31, 2022, 2021 and 2020, respectively. The Company recorded noncurrent liabilities of $1,346,000 and $1,043,000 related to interest and penalties for uncertain tax positions at January 31, 2022 and 2021, respectively.

The primary jurisdiction where our foreign earnings are derived is the Cayman Islands, where the Company is domiciled. The Company files income tax returns in the U.S. federal jurisdiction as well as many U.S. state and foreign jurisdictions. The Internal Revenue Service is currently examining the Company’s U.S. federal income tax return for the fiscal year ended January 31, 2017. The tax years 2013 to 2021 remain open to examination by U.S. federal tax authorities. The tax years 2009 to 2021 remain open to examination by U.S. state tax authorities. The tax years 2015 to 2021 remain open to examination by foreign tax authorities. Fiscal years outside of the normal statute of limitations remain open to audit by tax authorities due to tax attributes generated in those earlier years, which have been carried forward and may be audited in subsequent years when utilized.

The Company regularly assesses the likelihood of adverse outcomes resulting from potential tax examinations to determine the adequacy of its provision for income taxes. These assessments can require considerable estimates and judgments. During the fiscal year ended January 31, 2022, the gross amount of unrecognized tax benefits increased by $1.4 million to $30.9 million. The increase was primarily due to changes to our uncertain tax positions related to research credits. If the estimates of income tax liabilities prove to be less than the ultimate assessment, then a further charge to expense could be required. If events occur, and the payment of these amounts ultimately proves to be unnecessary, the reversal of the liabilities could result in tax benefits being recognized in the period in which the Company determines the liabilities are no longer necessary. The Company does not anticipate significant changes to its uncertain tax positions during the next twelve months.

As of January 31, 2022, the Company’s long-term income taxes payable, including estimated interest and penalties, was approximately $9.3 million. The Company was unable to make a reasonably reliable estimate of the timing of payments in individual years due to uncertainties in the timing of tax audits, if any, or their outcomes.

On July 27, 2015, the United States Tax Court issued a decision (“Tax Court Decision”) in Altera Corp. v. Commissioner, which concluded that related parties in a cost sharing arrangement are not required to share expenses related to share-based compensation. The Tax Court Decision was appealed by the Commissioner to the Ninth Circuit Court of Appeals (“Ninth Circuit”). On June 7, 2019, the Ninth Circuit issued an opinion that reversed the Tax Court Decision. On July 22, 2019, the taxpayer requested a rehearing before the full Ninth Circuit and the request was denied on November 12, 2019. On February 10, 2020, the taxpayer filed a petition to appeal the decision with the Supreme Court of the United States which was denied on June 22, 2020. The denial of the request by the Supreme Court did not have a material impact to the Company’s provision for income taxes.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (SX 210.4-08(h)(2))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Commitments and Contingencies

12 Months Ended

Jan. 31, 2022

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

15. Commitments and Contingencies

Contract Manufacturer Commitments

The Company’s components and products are procured and built by independent contract manufacturers based on sales forecasts. These forecasts include estimates of future demand, historical trends, analysis of sales and marketing activities, and adjustment of overall market conditions. The Company regularly issues purchase orders to independent contract manufacturers which are cancelable upon agreement between the Company and the third-party manufacturers. These manufacturing purchase commitments typically provide the Company with flexibility to cancel, reschedule or adjust requirements based upon business needs but the Company may incur certain costs depending on the production stage of the products. As of January 31, 2022 and 2021, total manufacturing purchase commitments were approximately $71.5 million and $48.2 million, respectively. The Company also reviews and assesses the need for any expected loss liabilities on a quarterly basis for all products that it does not expect to sell for which it has committed purchases from suppliers. As of January 31, 2022 and 2021, there were no material loss liabilities recorded in the consolidated balance sheets from adverse purchase commitments.

Indemnification

The Company, from time to time, in the normal course of business, indemnifies certain vendors with whom it enters into contractual relationships. The Company has agreed to hold the other party harmless against third-party claims in connection with the Company’s future products. The Company also indemnifies certain customers against third-party claims related to certain intellectual property matters. It is not possible to determine the maximum potential amount of liability under these indemnification obligations due to the limited history of prior indemnification claims and the unique facts and circumstances that are likely to be involved in each particular claim. The Company has not made payments under these obligations and no liabilities have been recorded for these obligations in the consolidated balance sheets as of January 31, 2022 and 2021, respectively.

Segment Reporting

12 Months Ended

Jan. 31, 2022

Segment Reporting [Abstract]

Segment Reporting

16. Segment Reporting

The Company operates in one reportable segment related to the development and sales of low-power, high-definition (HD), Ultra HD video compression, image processing and computer vision solutions. The Chief Executive Officer of the Company has been identified as the Chief Operating Decision Maker (the “CODM”) and manages the Company’s operations as a whole. For the purpose of evaluating financial performance and allocating resources, the CODM reviews financial information presented on a consolidated basis accompanied by information by customer and geographic region.

Geographic Revenue

The following table sets forth the Company’s revenue by geographic region based on bill-to location for the periods indicated.

	Year Ended January 31,
	2022		2021		2020
	(in thousands)
Taiwan	$	209,044	$	139,327	$	137,946
Asia Pacific		81,480		57,270		66,867
Europe		17,823		9,415		11,134
North America other than United States		18,191		10,304		8,402
United States		5,318		6,674		4,383
Total revenue	$	331,856	$	222,990	$	228,732

Substantially all of the Company’s property and equipment were located in the United States, Asia Pacific region and Europe. As of January 31, 2022, the net amount of these fixed assets located in these regions was approximate $3.1 million, $5.6 million and $1.5 million, respectively. As of January 31, 2021, the net amount of these fixed assets located in these regions was approximately $2.0 million, $2.4million and $1.1 million, respectively.

Major Customers

The customers representing 10% or more of revenue and accounts receivable for the fiscal years ended January 31, 2022, 2021 ad 2020 were Wintech and Chicony. For the fiscal years ended January 31, 2022, 2021 and 2020, Wintech accounted for approximately 62%, 63% and 60% of total revenue, respectively. For the fiscal years ended January 31, 2022, 2021 and 2020, Chicony accounted for approximately 13%, 16% and 18% of total revenue, respectively. Accounts receivable with Wintech and Chicony were approximately $23.3 million and $7.4 million as of January 31, 2022, respectively. Accounts receivable with Wintech and Chicony were approximately $12.0 million and $8.6 million as of January 31, 2021, respectively.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Organization and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Jan. 31, 2022

Accounting Policies [Abstract]

Organization

The Company sells its solutions to leading original design manufacturers, or ODMs, and original equipment manufacturers, or OEMs, globally.

Basis of Consolidation

Use of Estimates

Concentration of Risk

Foreign Currency Transactions

Fair Value of Financial Instruments

Cash Equivalents and Marketable Debt Securities

Restricted Cash

	As of January 31,
	2022		2021		2020
	(in thousands)
Cash and cash equivalents	$	171,043	$	241,274	$	231,403
Restricted cash		10		10		9
Total as presented in the consolidated statements of cash flows	$	171,053	$	241,284	$	231,412

Trade Accounts Receivable and Allowance for Credit Losses

Inventories

Property and Equipment

Impairment of Long-Lived Assets Excluding Goodwill

Equity Investment

Revenue Recognition

Cost of Revenue

Research and Development

Selling, General and Administrative

Stock-Based Compensation

Income Taxes

Net Income (Loss) Per Ordinary Share

Comprehensive Income (Loss)

Comprehensive income (loss) includes unrealized gains or losses from available-for-sale securities that are excluded from net income (loss).

Recent Accounting Pronouncements

Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Jan. 31, 2022

Accounting Policies [Abstract]

Schedule of Cash, Cash Equivalents and Restricted Cash

The following table presents cash, cash equivalents and restricted cash reported on the consolidated balance sheets, and the sums are presented on the consolidated statements of cash flows:

	As of January 31,
	2022		2021		2020
	(in thousands)
Cash and cash equivalents	$	171,043	$	241,274	$	231,403
Restricted cash		10		10		9
Total as presented in the consolidated statements of cash flows	$	171,053	$	241,284	$	231,412

Business Combination (Tables)

12 Months Ended

Jan. 31, 2022

Business Combinations [Abstract]

Summary of Aggregate Purchase Consideration

The aggregate purchase consideration has been allocated as follow:

	Amount
	(in thousands)
Cash consideration transferred	$	355,071
Net working capital adjustment		247
Fair value of stock-based compensation awards attributable to pre-combination services		407
Total purchase consideration	$	355,725

Summary of Fair Values of Assets Acquired and Liabilities Assumed

The following table sets forth the fair values of the assets acquired and liabilities assumed in connection with the acquisition:

	Acquisition Date
	Fair Value
	(in thousands)
Cash and cash equivalents	$	48,032
Accounts receivable		733
Inventories		194
Prepaid expenses and other current assets		134
Property and equipment		155
Intangible assets		32,800
Goodwill		277,024
Other non-current assets		34
Total assets acquired		359,106
Accounts payable		223
Accrued and other current liabilities		2,193
Deferred income tax liability, non-current		965
Total liabilities assumed		3,381
Total purchase consideration	$	355,725

Summary of Intangible Assets Acquired in Acquisition

Below is a summary of intangible assets acquired in the acquisition:

	Acquisition Date		Estimated
	Fair Value		Useful Lives
	(in thousands)
Trade name (1)	$	2,500	7 years
Customer relationships (2)		13,200	9 years
Developed technology (1)		17,100	7 years
Total intangible assets acquired	$	32,800

_____________

(1)	The fair values of trade name and developed technology were determined by applying the Relief-from-Royalty Method under the income approach.

(2)	Customer relationships represent the fair value of the existing relationships using the Multi-Period Excess Earnings Method.

Summary of Unaudited Information

	Pro Forma Year Ended
	January 31, 2022			January 31, 2021
	(unaudited, in thousands)
Revenue	$	333,323		$	223,497
Net loss	$	(35,330	)	$	(78,644	)

Financial Instruments and Fair Value (Tables)

12 Months Ended

Jan. 31, 2022

Investments All Other Investments [Abstract]

Schedule of Available-for-Sale Securities at Fair Value

All of the investments are classified as available-for-sale securities and reported at fair value in the consolidated balance sheets. By the end of the third quarter of fiscal year 2022, the Company fully liquidated all of the investments and reported the remaining cash equivalents as follows:

	As of January 31, 2022
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
Money market funds	$	20	$	—	$	—		$	20
Commercial paper		—		—		—			—
Corporate bonds		—		—		—			—
Asset-backed securities		—		—		—			—
U.S. government securities		—		—		—			—
Total cash equivalents and marketable debt securities	$	20	$	—	$	—		$	20

	As of January 31, 2021
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
Money market funds	$	171	$	—	$	—		$	171
Commercial paper		66,181		—		—			66,181
Corporate bonds		102,108		980		(7	)		103,081
Asset-backed securities		15,740		164		—			15,904
U.S. government securities		29,383		82		—			29,465
Total cash equivalents and marketable debt securities	$	213,583	$	1,226	$	(7	)	$	214,802

Schedule of Cash Equivalents and Marketable Debt Securities

	As of
	January 31, 2022		January 31, 2021
	(in thousands)
Included in cash equivalents	$	20	$	15,368
Included in marketable debt securities		—		199,434
Total cash equivalents and marketable debt securities	$	20	$	214,802

Summary of Contractual Maturities of Investments

The contractual maturities of the investments at January 31, 2022 and 2021 were as follows:

	As of
	January 31, 2022		January 31, 2021
	(in thousands)
Due within one year	$	20	$	135,899
Due within one to three years		—		78,903
Total cash equivalents and marketable debt securities	$	20	$	214,802

Schedule of Fair Value of Financial Instruments Measured on Recurring Basis

The following tables present the fair value of the financial instruments measured on a recurring basis as of January 31, 2022 and 2021, respectively:

	As of January 31, 2022
	Total		Level 1		Level 2		Level 3
	(in thousands)
Money market funds	$	20	$	20	$	—	$	—
Commercial paper		—		—		—		—
Corporate bonds		—		—		—		—
Asset-backed securities		—		—		—		—
U.S. government securities		—		—		—		—
Total cash equivalents and marketable debt securities	$	20	$	20	$	—	$	—

	As of January 31, 2021
	Total		Level 1		Level 2		Level 3
	(in thousands)
Money market funds	$	171	$	171	$	—	$	—
Commercial paper		66,181		—		66,181		—
Corporate bonds		103,081		—		103,081		—
Asset-backed securities		15,904		—		15,904		—
U.S. government securities		29,465		—		29,465		—
Total cash equivalents and marketable debt securities	$	214,802	$	171	$	214,631	$	—

Inventories (Tables)

12 Months Ended

Jan. 31, 2022

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventories at January 31, 2022 and 2021 consisted of the following:

	As of January 31,
	2022		2021
	(in thousands)
Work-in-progress	$	25,844	$	18,219
Finished goods		19,375		7,862
Total	$	45,219	$	26,081

Property and Equipment, Net (Tables)

12 Months Ended

Jan. 31, 2022

Property Plant And Equipment [Abstract]

Schedule of Property and Equipment

Property and equipment at January 31, 2022 and 2021 consisted of the following:

	As of January 31,
	2022			2021
	(in thousands)
Computer equipment and software	$	16,488		$	11,525
Machinery and equipment		7,532			6,946
Furniture and fixtures		1,243			969
Leasehold improvements		2,942			2,237
Construction in progress		1,060			331
		29,265			22,008
Less: accumulated depreciation and amortization		(19,131	)		(16,478	)
Total property and equipment, net	$	10,134		$	5,530

Intangible Assets, Net (Tables)

12 Months Ended

Jan. 31, 2022

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Components of Intangible Assets

The components of intangible assets as of January 31, 2022 and 2021 were as follows:

	As of January 31, 2022							As of January 31, 2021
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	(in thousands)
In-process research and development	$	—	$	—		$	—	$	4,100	$	—		$	4,100
Developed technology		21,200		(904	)		20,296		—		—			—
Customer relationships		13,200		(367	)		12,833		—		—			—
Trade name		2,500		(89	)		2,411		—		—			—
Software licenses		22,093		(11,331	)		10,762		21,043		(6,440	)		14,603
Total intangible assets, net	$	58,993	$	(12,691	)	$	46,302	$	25,143	$	(6,440	)	$	18,703

Summary of Expected Annual Amortization Expense Related to Software Licenses

The expected annual amortization expense related to these intangible assets as of January 31, 2022 is as follows:

	As of
	January 31, 2022
Fiscal Year	(in thousands)
2023	$	11,927
2024		8,176
2025		5,216
2026		4,853
2027		4,852
Thereafter		11,278
Total future amortization expenses:	$	46,302

Accrued and Other Current Liabilities (Tables)

12 Months Ended

Jan. 31, 2022

Payables And Accruals [Abstract]

Schedule of Accrued and Other Current Liabilities

Accrued and other current liabilities at January 31, 2022 and 2021 consisted of the following:

	As of January 31,
	2022		2021
	(in thousands)
Accrued employee compensation	$	30,044	$	18,105
Accrued product development costs		10,523		21,157
Software license liabilities, current		6,001		5,582
Other accrued liabilities		5,496		3,282
Total accrued and other current liabilities	$	52,064	$	48,126

Leases (Tables)

12 Months Ended

Jan. 31, 2022

Leases [Abstract]

Schedule of Supplemental Cash Flow Information Related to Leases

Supplemental cash flow information related to leases is as follows:

	Year Ended
	January 31, 2022		January 31, 2021
	(in thousands)
Cash paid for operating leases included in operating cash flows	$	3,608	$	2,416
Supplemental non-cash information related to lease liabilities arising from obtaining right-of-use assets	$	365	$	348
Leased assets obtained in exchange for operating lease liabilities arising from lease modifications	$	2,798	$	2,440

Schedule of Future Minimum Lease Payments for Lease Liabilities Excluding Parma Lease

	As of
	January 31, 2022
Fiscal Year	(in thousands)
2023	$	3,712
2024		3,482
2025		3,273
2026		1,431
2027		353
Thereafter		129
Total future annual minimum lease payments		12,380
Less: interest		(667	)
Total lease liabilities	$	11,713

Other Long-Term Liabilities (Tables)

12 Months Ended

Jan. 31, 2022

Other Liabilities Disclosure [Abstract]

Schedule of Other Long-Term Liabilities

Other long-term liabilities at January 31, 2022 and 2021 consisted of the following:

	As of January 31,
	2022		2021
	(in thousands)
Unrecognized tax benefits, including interest	$	9,313	$	8,966
Deferred tax liabilities, non-current		1,769		1,288
Software license liabilities, non-current		1,674		6,259
Other long-term liabilities		7		299
Total other long-term liabilities	$	12,763	$	16,812

Capital Stock (Tables)

12 Months Ended

Jan. 31, 2022

Equity [Abstract]

Schedule of Ordinary Shares Reserved for Future Issuance under Company's Equity Plans and Employee Stock Purchase Plan

As of January 31, 2022 and 2021, the following ordinary shares were reserved for future issuance under the Company’s equity plans and employee stock purchase plan:

	As of January 31,
	2022		2021
Shares reserved for options, restricted stock and restricted stock units		7,461,541		5,981,741
Shares reserved for employee stock purchase plan		2,624,704		2,299,143

Employee Benefits and Stock-based Compensation (Tables)

12 Months Ended

Jan. 31, 2022

Postemployment Benefits [Abstract]

Classification of Stock-based Compensation

The following table presents the classification of stock-based compensation for the periods indicated:

	Year Ended January 31,
	2022		2021		2020
	(in thousands)
Stock-based compensation:
Cost of revenue	$	1,489	$	1,328	$	1,184
Research and development		54,787		42,903		41,842
Selling, general and administrative		31,525		25,903		23,845
Total stock-based compensation	$	87,801	$	70,134	$	66,871

Weighted-Average Assumptions Used to Estimate Fair Value

The following table sets forth the weighted-average assumptions used to estimate the fair value of stock options and employee stock purchase plan awards for the periods indicated:

	Year Ended January 31,
	2022			2021			2020
Stock Options:
Volatility		51	%		52	%		52	%
Risk-free interest rate		1.04	%		0.52	%		1.82	%
Expected term (years)		5.06			5.78			6.01
Dividend yield		0	%		0	%		0	%
Employee stock purchase plan awards:
Volatility		57	%		59	%		47	%
Risk-free interest rate		0.06	%		0.21	%		2.23	%
Expected term (years)		0.5			0.5			0.5
Dividend yield		0	%		0	%		0	%

Stock Option Activities

The following table summarizes stock option activities for the periods indicated:

	Option Outstanding
												Weighted-
										Total Intrinsic		Average
						Weighted-		Weighted-		Value of		Remaining		Aggregate
				Weighted-		Average		Average		options		Contractual		Intrinsic
				Average		Grant-date		Acquisition-date		Exercised		Term		Value
	Shares			Exercise Price		Fair Value		Fair Value		(in thousands)		(in years)		(in thousands)
Outstanding at January 31, 2019		1,459,064		$	28.31
Granted		66,850			50.56	$	25.35
Exercised		(366,886	)		15.52					$	13,263
Forfeited		(14,931	)		46.29
Expired		(19,451	)		64.53
Outstanding at January 31, 2020		1,124,646			32.93
Granted		51,200			59.54	$	28.37
Exercised		(421,736	)		24.52					$	19,401
Forfeited		(11,618	)		46.69
Expired		(23,349	)		70.11
Outstanding at January 31, 2021		719,143			38.33
Granted		14,700			110.19	$	50.28
Assumed		163,581			23.10			$	173.04
Exercised		(269,287	)		28.23					$	25,622
Forfeited		(7,669	)		68.95
Expired		(1,146	)		9.86
Outstanding at January 31, 2022		619,322		$	40.08							5.25		$	61,975
Exercisable at January 31, 2022		399,764		$	42.40								3.92	$	39,076

Restricted Stock and Restricted Stock Units Activities

The following table summarizes restricted stock and restricted stock units activities for the periods indicated:

				Weighted-
				Average
				Grant-Date
	Shares			Fair Value
Unvested at January 31, 2019		2,395,516		$	48.49
Granted		1,329,288			54.54
Vested		(1,012,581	)		51.24
Forfeited		(94,957	)		54.26
Unvested at January 31, 2020		2,617,266			50.30
Granted		1,499,203			53.45
Vested		(1,162,883	)		50.53
Forfeited		(81,785	)		54.48
Unvested at January 31, 2021		2,871,801			51.73
Granted		1,213,257			128.80
Vested		(1,367,309	)		53.85
Forfeited		(66,614	)		71.59
Unvested at January 31, 2022		2,651,135		$	85.41

Net Loss Per Ordinary Share (Tables)

12 Months Ended

Jan. 31, 2022

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Loss Per Ordinary Share

The following table sets forth the computation of basic and diluted net loss per ordinary share for the periods indicated:

	Year Ended January 31,
	2022			2021			2020
	(in thousands, except share and per share data)
Numerator:
Net loss	$	(26,411	)	$	(59,786	)	$	(44,792	)
Denominator:
Weighted-average ordinary shares - basic		36,577,120			34,679,717			33,083,562
Weighted-average ordinary shares - diluted		36,577,120			34,679,717			33,083,562
Net loss per ordinary share:
Basic	$	(0.72	)	$	(1.72	)	$	(1.35	)
Diluted	$	(0.72	)	$	(1.72	)	$	(1.35	)

Weighted-Average Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Ordinary Share

The following weighted-average potentially dilutive securities were excluded from the computation of diluted net loss per ordinary share as their effect would have been antidilutive:

	Year Ended January 31,
	2022		2021		2020
Options to purchase ordinary shares		327,747		660,025		913,678
Restricted stock and restricted stock units		1,388,091		1,440,176		1,139,269
Employee stock purchase plan		8,904		27,789		8,530
		1,724,742		2,127,990		2,061,477

Income Taxes (Tables)

12 Months Ended

Jan. 31, 2022

Income Tax Disclosure [Abstract]

Summary of Loss before Income Taxes

Loss before income taxes consisted of the following for the periods indicated:

	Year Ended January 31,
	2022			2021			2020
	(in thousands)
U.S. operations	$	(5,842	)	$	8		$	845
Non-U.S. operations		(22,799	)		(57,311	)		(42,473	)
Loss before income taxes	$	(28,641	)	$	(57,303	)	$	(41,628	)

Schedule of Income Tax Provision (Benefit)

Income tax provision (benefit) consisted of the following for the periods indicated:

	Year Ended January 31,
	2022			2021			2020
	(in thousands)
Current:
U.S. federal tax	$	907		$	1,705		$	1,440
U.S. state taxes		—			256			3
Non-U.S. foreign taxes		1,778			1,019			1,540
		2,685			2,980			2,983
Deferred:
U.S. federal tax		(4,819	)		(432	)		182
U.S. state taxes		(14	)		—			—
Non-U.S. foreign taxes		(82	)		(65	)		(1	)
		(4,915	)		(497	)		181
Provision (benefit) for income taxes	$	(2,230	)	$	2,483		$	3,164

Schedule of Reconciliation Between the Provision (Benefit) for Income Taxes at the Statutory Rate and the Effective Tax Rate

For purposes of the reconciliation between the provision (benefit) for income taxes at the statutory rate and the effective tax rate, a notional U.S. 21% rate is applied to pretax income (loss) as a result of the following for the periods indicated, respectively:

	Year Ended January 31,
	2022			2021			2020
	(in thousands)
Provision at U.S. notional statutory rate	$	(6,015	)	$	(12,034	)	$	(8,742	)
U.S. state taxes		(11	)		212			3
Non-U.S. foreign tax differential		6,483			12,989			10,458
Stock-based compensation		1,900			4,943			4,172
U.S. R&D credit		(5,886	)		(3,928	)		(3,109	)
Valuation allowance		765			—			—
FIN48 interest		311			—			—
Other		223			301			382
Provision (benefit) for income taxes	$	(2,230	)	$	2,483		$	3,164

Schedule of Deferred Tax Assets and Liabilities

Temporary differences that gave rise to significant portions of the Company’s deferred tax assets and liabilities at January 31, 2022 and 2021 were as follows:

	As of January 31,
	2022			2021
	(in thousands)
Deferred tax assets:
Federal and state credits	$	33,485		$	24,394
Net operating losses		7,466			—
Expenses not currently deductible		1,294			939
Operating lease liabilities		2,096			2,144
Stock-based compensation		3,632			3,349
Foreign deferred		191			184
Gross deferred tax assets		48,164			31,010
Valuation allowance		(24,083	)		(17,962	)
Total deferred tax assets	$	24,081		$	13,048
Deferred tax liabilities
Intangible assets		(8,150	)		—
Property and equipment		(386	)		(1,443	)
Operating lease assets		(1,971	)		(1,978	)
Net deferred tax assets	$	13,574		$	9,627

Summary of Tax Valuation Allowance

Tax valuation allowance for the periods indicated below were as follows:

							Deductions
					Additions		Charged to
	Balance at		Additional		Charged to		Expenses		Balance at
	Beginning of		Charged to		Other		or Other		End of
	Period		Expenses		Account		Accounts		Period
	(in thousands)
Tax Valuation Allowance
Year ended January 31, 2022	$	17,962		4,874		1,247			$	24,083
Year ended January 31, 2021	$	14,670		3,292		—		—	$	17,962
Year ended January 31, 2020	$	12,526		2,144		—		—	$	14,670

Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits

The following table sets forth a reconciliation of the beginning and ending amount of unrecognized tax benefits:

	Year Ended January 31,
	2022			2021			2020
	(in thousands)
Beginning balance:	$	29,527		$	42,695		$	37,531
Additions based on tax positions related to the current year		1,412			3,360			4,964
Additions for tax positions of prior years		55			16			252
Reductions for tax positions in prior years		—			(10,212	)		—
Settlements for prior periods		—			(6,087	)		—
Lapse of applicable statute of limitations		(110	)		(245	)		(52	)
Ending balance:	$	30,884		$	29,527		$	42,695

Segment Reporting (Tables)

12 Months Ended

Jan. 31, 2022

Segment Reporting [Abstract]

Company's Revenue by Geographic Region Based on Bill-to Location

The following table sets forth the Company’s revenue by geographic region based on bill-to location for the periods indicated.

	Year Ended January 31,
	2022		2021		2020
	(in thousands)
Taiwan	$	209,044	$	139,327	$	137,946
Asia Pacific		81,480		57,270		66,867
Europe		17,823		9,415		11,134
North America other than United States		18,191		10,304		8,402
United States		5,318		6,674		4,383
Total revenue	$	331,856	$	222,990	$	228,732

Organization and Summary of Significant Accounting Policies - Schedule of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 171,043	$ 241,274	$ 231,403
Restricted cash	10	10	9
Total as presented in the consolidated statements of cash flows	$ 171,053	$ 241,284	$ 231,412	$ 194,058

Organization and Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Jan. 31, 2022 USD ($) Reportingunit	Jan. 31, 2021 USD ($)	Jan. 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Material inventory losses recognized	$ 0	$ 0	$ 0
Number of reporting unit for goodwill impairment \| Reportingunit	1
Goodwill impairment	$ 0	$ 0	$ 0
Impairment of long-lived assets	0
Impairment losses on investment	$ 0
Expected dividend yield	0.00%	0.00%	0.00%
Prepaid Expenses and Other Current Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Grants recorded	$ 1,300,000
Other Non-current Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Grants recorded	$ 600,000

Business Combination - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Nov. 05, 2021	Jan. 31, 2022	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Business Acquisition [Line Items]
Goodwill		$ 303,625	$ 303,625	$ 26,601
Revenue			331,856	222,990	$ 228,732
Net loss			$ (26,411)	$ (59,786)	$ (44,792)
Oculii Corp [Member]
Business Acquisition [Line Items]
Date of acquisition			Nov. 05, 2021
Percentage of voting rights	100.00%
Total purchase consideration	$ 355,725
Goodwill	277,024
Intangible assets	32,800
Net assets acquired	$ 45,900
Business combination purchase price allocation measurement period			The purchase price allocation is subject to change during the measurement period, which is not to exceed one year from the acquisition date.
Estimated useful lives			7 years 9 months 18 days
Oculii Corp [Member] \| Post Combination [Member]
Business Acquisition [Line Items]
Revenue		500
Net loss		$ 6,100
Selling General and Administrative Expenses [Member] \| Oculii Corp [Member]
Business Acquisition [Line Items]
Acquisition related costs			$ 3,800

Business Combination - Summary of Aggregate Purchase Consideration (Details) - Oculii Corp [Member] $ in Thousands	Nov. 05, 2021 USD ($)
Business Acquisition [Line Items]
Cash consideration transferred	$ 355,071
Net working capital adjustment	247
Fair value of stock-based compensation awards attributable to pre-combination services	407
Total purchase consideration	$ 355,725

Business Combination - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Nov. 05, 2021	Jan. 31, 2022	Jan. 31, 2021
Business Acquisition [Line Items]
Goodwill		$ 303,625	$ 26,601
Deferred income tax liability, non-current		$ 1,769	$ 1,288
Oculii Corp [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	$ 48,032
Accounts receivable	733
Inventories	194
Prepaid expenses and other current assets	134
Property and equipment	155
Intangible assets	32,800
Goodwill	277,024
Other non-current assets	34
Total assets acquired	359,106
Accounts payable	223
Accrued and other current liabilities	2,193
Deferred income tax liability, non-current	965
Total liabilities assumed	3,381
Total purchase consideration	$ 355,725

Business Combination - Summary of Intangible Assets Acquired in Acquisition (Details) - Oculii Corp [Member] - USD ($) $ in Thousands		12 Months Ended
	Nov. 05, 2021	Jan. 31, 2022
Business Acquisition [Line Items]
Total intangible assets acquired	$ 32,800
Estimated useful lives		7 years 9 months 18 days
Trade Name [Member]
Business Acquisition [Line Items]
Total intangible assets acquired	$ 2,500
Estimated useful lives	7 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Total intangible assets acquired	$ 13,200
Estimated useful lives	9 years
Developed Technology [Member]
Business Acquisition [Line Items]
Total intangible assets acquired	$ 17,100
Estimated useful lives	7 years

Business Combination - Summary of Unaudited Information (Details) - Oculii Corp [Member] - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Business Acquisition [Line Items]
Revenue	$ 333,323	$ 223,497
Net loss	$ (35,330)	$ (78,644)

Financial Instruments and Fair Value - Schedule of Available-for-Sale Securities at Fair Value (Detail) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 20	$ 213,583
Unrealized Gains	0	1,226
Unrealized Losses	0	(7)
Fair Value	20	214,802
Money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20	171
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	20	171
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	66,181
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	0	66,181
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	102,108
Unrealized Gains	0	980
Unrealized Losses	0	(7)
Fair Value	0	103,081
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	15,740
Unrealized Gains	0	164
Unrealized Losses	0	0
Fair Value	0	15,904
U.S. government securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	29,383
Unrealized Gains	0	82
Unrealized Losses	0	0
Fair Value	$ 0	$ 29,465

Financial Instruments and Fair Value - Schedule of Cash Equivalents and Marketable Debt Securities (Detail) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Total cash equivalents and marketable debt securities	$ 20	$ 214,802
Included in cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Total cash equivalents and marketable debt securities	20	15,368
Included in marketable debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total cash equivalents and marketable debt securities	$ 0	$ 199,434

Financial Instruments and Fair Value - Summary of Contractual Maturities of Investments (Detail) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Available For Sale Securities Debt Maturities Fair Value [Abstract]
Due within one year	$ 20	$ 135,899
Due within one to three years	0	78,903
Total cash equivalents and marketable debt securities	$ 20	$ 214,802

Inventories - Schedule of Inventory (Detail) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Inventory Disclosure [Abstract]
Work-in-progress	$ 25,844	$ 18,219
Finished goods	19,375	7,862
Total	$ 45,219	$ 26,081

Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Property Plant And Equipment [Abstract]
Depreciation of property and equipment	$ 2.8	$ 2.6	$ 2.8

Property and Equipment, Net - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 29,265	$ 22,008
Less: accumulated depreciation and amortization	(19,131)	(16,478)
Total property and equipment, net	10,134	5,530
Computer equipment and software [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	16,488	11,525
Machinery and equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	7,532	6,946
Furniture and fixtures [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,243	969
Leasehold improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,942	2,237
Construction in progress [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 1,060	$ 331

Intangible Assets, Net - Additional Information (Detail) - USD ($)		12 Months Ended
	Nov. 05, 2021	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense		$ 46,302,000	$ 18,703,000
Liabilities associated with noncancelable internal-use software license at net present value, current		6,001,000	5,582,000
Liabilities associated with noncancelable internal-use software license at net present value, non-current		1,674,000	6,259,000
Amortization expense		7,800,000	6,500,000	$ 5,900,000
Impairment of intangible assets		0	0	$ 0
Oculii Corp [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 32,800,000
Developed Technology [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense		20,296,000	0
Developed Technology [Member] \| Oculii Corp [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets acquired	17,100,000
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense		12,833,000	0
Customer Relationships [Member] \| Oculii Corp [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets acquired	13,200,000
IPR&D [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense		0	4,100,000
Intangible assets acquired		$ 4,100,000
Estimated economic life		7 years
Trade Name [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense		$ 2,411,000	0
Trade Name [Member] \| Oculii Corp [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 2,500,000
Internal-use software licenses [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense		10,762,000	$ 14,603,000
Fully amortized software licenses retired		$ 1,500,000

Intangible Assets, Net - Summary of Components of Intangible Assets (Detail) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 58,993	$ 25,143
Accumulated Amortization	(12,691)	(6,440)
Net Carrying Amount	46,302	18,703
In-process research and development [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	4,100
Accumulated Amortization	0	0
Net Carrying Amount	0	4,100
Developed technology [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	21,200	0
Accumulated Amortization	(904)	0
Net Carrying Amount	20,296	0
Customer relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,200	0
Accumulated Amortization	(367)	0
Net Carrying Amount	12,833	0
Trade Name [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,500	0
Accumulated Amortization	(89)	0
Net Carrying Amount	2,411	0
Software licenses [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	22,093	21,043
Accumulated Amortization	(11,331)	(6,440)
Net Carrying Amount	$ 10,762	$ 14,603

Intangible Assets, Net - Summary of Expected Annual Amortization Expense Related to Software Licenses (Detail) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
2023	$ 11,927
2024	8,176
2025	5,216
2026	4,853
2027	4,852
Thereafter	11,278
Net Carrying Amount	$ 46,302	$ 18,703

Goodwill - Additional Information (Detail)	12 Months Ended
Goodwill - Additional Information (Detail)	Jan. 31, 2022 USD ($) Segment	Jan. 31, 2021 USD ($)	Jan. 31, 2020 USD ($)	Nov. 05, 2021 USD ($)
Finite Lived Intangible Assets [Line Items]
Number of reportable segments \| Segment	1
Goodwill	$ 303,625,000	$ 26,601,000
Goodwill impairment	0	$ 0	$ 0
Oculii Corp [Member]
Finite Lived Intangible Assets [Line Items]
Goodwill				$ 277,024,000
Increase in goodwill	277,000,000.0
Reporting Unit [Member]
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 0

Accrued and Other Current Liabilities - Schedule of Accrued and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Payables And Accruals [Abstract]
Accrued employee compensation	$ 30,044	$ 18,105
Accrued product development costs	10,523	21,157
Software license liabilities, current	6,001	5,582
Other accrued liabilities	5,496	3,282
Total accrued and other current liabilities	$ 52,064	$ 48,126

Leases - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2019	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Lessee Lease Description [Line Items]
Operating lease expense		$ 3.5	$ 3.0	$ 3.0
Weighted-average remaining lease term - operating leases		3 years 7 months 6 days
Weighted-average discount rate - operating leases		3.55%
Extended Office Lease [Member]
Lessee Lease Description [Line Items]
Increase to operating lease right-of-use assets		$ 4.4
Increase to operating lease liabilities		$ 4.4
Shanghai [Member] \| Extended Office Lease [Member]
Lessee Lease Description [Line Items]
Inception date		Dec. 01, 2021
Expiration date		Nov. 30, 2024
Lease term		3 years
Shanghai [Member] \| Additional Office Space [Member]
Lessee Lease Description [Line Items]
Expiration date		Nov. 30, 2024
Lease term		40 months
Commencement date		Aug. 01, 2021
Hong Kong [Member] \| Extended Office Lease [Member]
Lessee Lease Description [Line Items]
Inception date		Dec. 01, 2021
Expiration date		Nov. 30, 2026
Lease term		5 years
Italy [Member] \| Building [Member]
Lessee Lease Description [Line Items]
Leased property construction completion year	2024
Italy [Member] \| Additional Office Space [Member] \| Building [Member]
Lessee Lease Description [Line Items]
Lease term	35 years
Italy [Member] \| Parma Lease [Member] \| Building [Member]
Lessee Lease Description [Line Items]
Future undiscounted cash payments	$ 2.2
Future undiscounted cash payments in construction phase	1.8
Future undiscounted cash payments, paid in remainder of lease term	$ 0.4

Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Leases [Abstract]
Cash paid for operating leases included in operating cash flows	$ 3,608	$ 2,416
Supplemental non-cash information related to lease liabilities arising from obtaining right-of-use assets	365	348
Leased assets obtained in exchange for operating lease liabilities arising from lease modifications	$ 2,798	$ 2,440

Leases - Schedule of Future Minimum Lease Payments for Lease Liabilities Excluding Parma Lease (Detail) $ in Thousands	Jan. 31, 2022 USD ($)
Leases [Abstract]
2023	$ 3,712
2024	3,482
2025	3,273
2026	1,431
2027	353
Thereafter	129
Total future annual minimum lease payments	12,380
Less: interest	(667)
Total lease liabilities	$ 11,713

Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Detail) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Other Liabilities Disclosure [Abstract]
Unrecognized tax benefits, including interest	$ 9,313	$ 8,966
Deferred income tax liability, non-current	1,769	1,288
Software license liabilities, non-current	1,674	6,259
Other long-term liabilities	7	299
Total other long-term liabilities	$ 12,763	$ 16,812

Capital Stock - Additional Information (Detail) - USD ($)						12 Months Ended			68 Months Ended
	May 25, 2021	May 29, 2020	Mar. 16, 2020	May 29, 2019	Jun. 30, 2016	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2022
Class Of Stock [Line Items]
Preference shares, shares authorized						20,000,000	20,000,000		20,000,000
Preference shares, par value						$ 0.00045	$ 0.00045		$ 0.00045
Preference shares, shares issued						0	0		0
Preference shares, shares outstanding						0	0		0
Amount authorized under stock repurchase program						$ 275,000,000.0			$ 275,000,000.0
Stock repurchase program, inception period					2016-06
Stock repurchased, shares									4,011,595
Stock repurchased during period, cash						0	$ 1,000,000	$ 0	$ 175,800,000
Stock Repurchase Program $50.0 Million Authorization [Member]
Class Of Stock [Line Items]
Stock repurchase program, authorization date				May 29, 2019
Stock repurchase program, expiration date				Jun. 30, 2020
Stock repurchased, shares			25,719
Stock repurchased during period, cash			$ 1,000,000.0
Amount available under stock repurchase program						$ 49,000,000.0			$ 49,000,000.0
Stock repurchase program, extended expiration period	12 months	12 months
Stock repurchase program, extended expiration date	Jun. 30, 2022	Jun. 30, 2021
Stock Repurchase Program $50.0 Million Authorization [Member] \| Maximum [Member]
Class Of Stock [Line Items]
Amount authorized under stock repurchase program				$ 50,000,000.0

Capital Stock - Schedule of Ordinary Shares Reserved for Future Issuance under Company's Equity Plans and Employee Stock Purchase Plan (Detail) - shares	Jan. 31, 2022	Jan. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved	7,461,541	5,981,741
ESPP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved	2,624,704	2,299,143

Employee Benefits and Stock-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		2 Months Ended	3 Months Ended		12 Months Ended
	Nov. 30, 2021	Jun. 30, 2021	Jun. 30, 2021	Apr. 30, 2021	Apr. 30, 2020	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Contribution expense						$ 0.6
Accrued share based compensation expense						$ 7.8
Closing price of stock						$ 140.15
Stock options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost, stock options						$ 27.7
Weighted average recognition period						2 years 6 months 10 days
Restricted Stock and Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total fair value of vesting dates of restricted stock and restricted stock units vested						$ 192.5	$ 69.0	$ 52.1
Restricted stock units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average recognition period						2 years 3 months 25 days
Total unrecognized compensation cost, restricted stock units						$ 194.4
Aggregate intrinsic value of unvested restricted stock units						$ 371.6
2021 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ordinary shares reserved for issuance		1,350,000
Maximum number of ordinary shares reserved for issuance		6,834,208	6,834,208
2012 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional ordinary shares reserved for issuance			0	1,599,634	1,521,252
Voting power of all classes of company's shares						10.00%
2012 Equity Incentive Plan [Member] \| Stock options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option's term of up to 10 years from grant date						10 years	10 years	10 years
Vesting schedule						vest 25% on the first anniversary service date of the grant and the remainder vest ratably over the following 36 months.
2012 Equity Incentive Plan [Member] \| Restricted Stock and Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting schedule						1/4th of the shares on the first anniversary service date of the grant and 1/16th of the shares vest every 3 months thereafter, so as to be 100% vested on the fourth anniversary of the vesting commencement date
2017 Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional ordinary shares reserved for issuance	0
Incentive stock options granted to 10% ownership [Member] \| Stock options [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price of ordinary shares, percentage						110.00%
Non statutory stock options and incentive stock options granted to less than 10% ownership [Member] \| Stock options [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price of ordinary shares, percentage							100.00%
ESPP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price of ordinary shares, percentage						85.00%	85.00%	85.00%
Percentage of salary contribution by employees						15.00%
Additional ordinary shares reserved for issuance				444,343	422,570
ESPP [Member] \| Scenario, plan automatically increased by the lessor of [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Annual increase in ordinary shares for available for future issuance				1,500,000	1,500,000
Annual shares increase for future issuance by percentage under 2012 employee stock purchase plan				1.25%	1.25%

Employee Benefits and Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Stock-based compensation:
Total stock-based compensation	$ 87,801	$ 70,134	$ 66,871
Cost of revenue [Member]
Stock-based compensation:
Total stock-based compensation	1,489	1,328	1,184
Research and development [Member]
Stock-based compensation:
Total stock-based compensation	54,787	42,903	41,842
Selling, general and administrative [Member]
Stock-based compensation:
Total stock-based compensation	$ 31,525	$ 25,903	$ 23,845

Employee Benefits and Stock-based Compensation - Weighted-Average Assumptions Used to Estimate Fair Value (Detail)	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%
Stock options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Volatility	51.00%	52.00%	52.00%
Risk-free interest rate	1.04%	0.52%	1.82%
Expected term (years)	5 years 21 days	5 years 9 months 10 days	6 years 3 days
Dividend yield	0.00%	0.00%	0.00%
Employee stock purchase plan awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Volatility	57.00%	59.00%	47.00%
Risk-free interest rate	0.06%	0.21%	2.23%
Expected term (years)	6 months	6 months	6 months
Dividend yield	0.00%	0.00%	0.00%

Employee Benefits and Stock-based Compensation - Stock Option Activities (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Outstanding	719,143	1,124,646	1,459,064
Shares, Granted	14,700	51,200	66,850
Shares, Assumed	163,581
Shares, Exercised	(269,287)	(421,736)	(366,886)
Shares, Forfeited	(7,669)	(11,618)	(14,931)
Shares, Expired	(1,146)	(23,349)	(19,451)
Shares, Outstanding	619,322	719,143	1,124,646
Shares, Exercisable	399,764
Weighted-Average Exercise Price, Outstanding	$ 38.33	$ 32.93	$ 28.31
Weighted-Average Exercise Price, Granted	110.19	59.54	50.56
Weighted-Average Exercise Price, Assumed	23.10
Weighted-Average Exercise Price, Exercised	28.23	24.52	15.52
Weighted-Average Exercise Price, Forfeited	68.95	46.69	46.29
Weighted-Average Exercise Price, Expired	9.86	70.11	64.53
Weighted-Average Exercise Price, Outstanding	40.08	38.33	32.93
Weighted-Average Exercise Price, Exercisable	42.40
Weighted-Average Grant-date Fair Value, Granted	50.28	$ 28.37	$ 25.35
Weighted-Average Acquisition-date Fair Value, Assumed	$ 173.04
Total Intrinsic Value of options Exercised	$ 25,622	$ 19,401	$ 13,263
Weighted-Average Remaining Contractual Term, Outstanding	5 years 3 months
Weighted-Average Remaining Contractual Term, Exercisable	3 years 11 months 1 day
Aggregate Intrinsic Value, Outstanding	$ 61,975
Aggregate Intrinsic Value, Exercisable	$ 39,076

Employee Benefits and Stock-based Compensation - Restricted Stock and Restricted Stock Units Activities (Detail) - Restricted stock and restricted stock units [Member] - $ / shares	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Unvested, beginning balance	2,871,801	2,617,266	2,395,516
Shares, Granted	1,213,257	1,499,203	1,329,288
Shares, Vested	(1,367,309)	(1,162,883)	(1,012,581)
Shares, Forfeited	(66,614)	(81,785)	(94,957)
Shares, Unvested, ending balance	2,651,135	2,871,801	2,617,266
Weighted-Average Grant-Date Fair Value, Unvested, beginning balance	$ 51.73	$ 50.30	$ 48.49
Weighted-Average Grant-Date Fair Value, Granted	128.80	53.45	54.54
Weighted-Average Grant-Date Fair Value, Vested	53.85	50.53	51.24
Weighted-Average Grant-Date Fair Value, Forfeited	71.59	54.48	54.26
Weighted-Average Grant-Date Fair Value, Unvested, ending balance	$ 85.41	$ 51.73	$ 50.30

Net Loss Per Ordinary Share - Computation of Basic and Diluted Net Loss Per Ordinary Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Numerator:
Net loss	$ (26,411)	$ (59,786)	$ (44,792)
Denominator:
Weighted-average ordinary shares - basic	36,577,120	34,679,717	33,083,562
Weighted-average ordinary shares - diluted	36,577,120	34,679,717	33,083,562
Net loss per ordinary share:
Basic	$ (0.72)	$ (1.72)	$ (1.35)
Diluted	$ (0.72)	$ (1.72)	$ (1.35)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(25))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Net Loss Per Ordinary Share - Weighted-Average Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Ordinary Share (Detail) - shares	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of earnings per share	1,724,742	2,127,990	2,061,477
Options to purchase ordinary shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of earnings per share	327,747	660,025	913,678
Restricted stock and restricted stock units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of earnings per share	1,388,091	1,440,176	1,139,269
Employee stock purchase plan awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of earnings per share	8,904	27,789	8,530

Income Taxes - Summary of Loss before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Results Of Operations Income Before Income Taxes [Abstract]
U.S. operations	$ (5,842)	$ 8	$ 845
Non-U.S. operations	(22,799)	(57,311)	(42,473)
Loss before income taxes	$ (28,641)	$ (57,303)	$ (41,628)

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Income Taxes - Schedule of Income Tax Provision (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Current:
U.S. federal tax	$ 907	$ 1,705	$ 1,440
U.S. state taxes	0	256	3
Non-U.S. foreign taxes	1,778	1,019	1,540
Current income tax provision	2,685	2,980	2,983
Deferred:
U.S. federal tax	(4,819)	(432)	182
U.S. state taxes	(14)	0	0
Non-U.S. foreign taxes	(82)	(65)	(1)
Deferred income tax provision	(4,915)	(497)	181
Provision (benefit) for income taxes	$ (2,230)	$ 2,483	$ 3,164

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Income Taxes [Line Items]
Statutory tax rate	21.00%	21.00%	21.00%
Deferred tax liabilities, not recognized	$ 14,400,000
Cumulative undistributed earnings of foreign subsidiaries	97,700,000
Gross deferred tax assets, net of deferred tax liabilities before valuation allowance	37,700,000	$ 27,600,000
Valuation allowance	24,083,000	17,962,000
Unrecognized tax benefits	30,884,000	29,527,000	$ 42,695,000	$ 37,531,000
Unrecognized tax benefits that would impact effective tax rate	24,400,000
Interest expense and penalties related to uncertain tax positions	303,000	283,000	$ 358,000
Noncurrent liabilities related to interest and penalties for uncertain tax positions	1,346,000	1,043,000
Increased unrecognized tax benefits	1,400,000
Unrecognized tax benefits gross	30,900,000
Long term income taxes payable, including estimated interest and penalties	9,300,000
Other Long-Term Liabilities [Member]
Income Taxes [Line Items]
Income tax liabilities considered as other long term liabilities	8,000,000.0	$ 7,900,000
U.S. state tax authorities [Member]
Income Taxes [Line Items]
Valuation allowance	$ 22,100,000
U.S. state tax authorities [Member] \| Earliest tax year [Member]
Income Taxes [Line Items]
Income tax examination, year	2009
U.S. state tax authorities [Member] \| Latest tax year [Member]
Income Taxes [Line Items]
Income tax examination, year	2021
U.S. federal tax authorities [Member] \| Earliest tax year [Member]
Income Taxes [Line Items]
Income tax examination, year	2013
U.S. federal tax authorities [Member] \| Latest tax year [Member]
Income Taxes [Line Items]
Income tax examination, year	2021
Foreign tax authorities [Member] \| Earliest tax year [Member]
Income Taxes [Line Items]
Income tax examination, year	2015
Foreign tax authorities [Member] \| Latest tax year [Member]
Income Taxes [Line Items]
Income tax examination, year	2021
California state [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 7,000,000.0
Net operating loss carryforwards begin to expire in fiscal year		2036
Research and development credit carryforwards	33,000,000.0
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	34,100,000
Research and development credit carryforwards	$ 28,100,000
Federal credits begin to expire in fiscal year		2035

Income Taxes - Schedule of Reconciliation Between the Provision (Benefit) for Income Taxes at the Statutory Rate and the Effective Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Income Tax Disclosure [Abstract]
Provision at U.S. notional statutory rate	$ (6,015)	$ (12,034)	$ (8,742)
U.S. state taxes	(11)	212	3
Non-U.S. foreign tax differential	6,483	12,989	10,458
Stock-based compensation	1,900	4,943	4,172
U.S. R&D credit	(5,886)	(3,928)	(3,109)
Valuation allowance	765	0	0
FIN48 interest	311	0	0
Other	223	301	382
Provision (benefit) for income taxes	$ (2,230)	$ 2,483	$ 3,164

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Deferred tax assets:
Federal and state credits	$ 33,485	$ 24,394
Net operating losses	7,466	0
Expenses not currently deductible	1,294	939
Operating lease liabilities	2,096	2,144
Stock-based compensation	3,632	3,349
Foreign deferred	191	184
Gross deferred tax assets	48,164	31,010
Valuation allowance	(24,083)	(17,962)
Total deferred tax assets	24,081	13,048
Deferred tax liabilities
Intangible assets	(8,150)	0
Property and equipment	(386)	(1,443)
Operating lease assets	(1,971)	(1,978)
Net deferred tax assets	$ 13,574	$ 9,627

Income Taxes - Summary of Tax Valuation Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 17,962
Balance at End of Period	24,083	$ 17,962
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	17,962	14,670	$ 12,526
Additional Charged to Expenses	4,874	3,292	2,144
Additions Charged to Other Account	1,247	0	0
Deductions Charged to Expenses or Other Accounts	0	0	0
Balance at End of Period	$ 24,083	$ 17,962	$ 14,670

Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Income Tax Disclosure [Abstract]
Beginning balance	$ 29,527	$ 42,695	$ 37,531
Additions based on tax positions related to the current year	1,412	3,360	4,964
Additions for tax positions of prior years	55	16	252
Reductions for tax positions in prior years	0	(10,212)	0
Settlements for prior periods	0	(6,087)	0
Lapse of applicable statute of limitations	(110)	(245)	(52)
Ending balance	$ 30,884	$ 29,527	$ 42,695

Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Loss Contingencies [Line Items]
Total manufacturing purchase commitments	$ 71,500,000	$ 48,200,000
Indemnification agreement [Member]
Loss Contingencies [Line Items]
Payments under indemnification obligations	0	0
Liabilities recorded under indemnification obligations	$ 0	$ 0

Segment Reporting - Additional Information (Detail) $ in Thousands	12 Months Ended
	Jan. 31, 2022 USD ($) Segment	Jan. 31, 2021 USD ($)	Jan. 31, 2020
Concentration Risk [Line Items]
Number of reportable segments \| Segment	1
Property and equipment, net	$ 10,134	$ 5,530
Accounts receivable	$ 44,307	$ 24,974
Sales revenue, net [Member] \| Wintech [Member] \| Customer concentration risk [Member]
Concentration Risk [Line Items]
Percentage of revenue	62.00%	63.00%	60.00%
Sales revenue, net [Member] \| Chicony [Member] \| Customer concentration risk [Member]
Concentration Risk [Line Items]
Percentage of revenue	13.00%	16.00%	18.00%
Accounts receivable [Member] \| Wintech [Member] \| Credit concentration risk [Member]
Concentration Risk [Line Items]
Accounts receivable	$ 23,300	$ 12,000
Accounts receivable [Member] \| Chicony [Member] \| Credit concentration risk [Member]
Concentration Risk [Line Items]
Accounts receivable	7,400	8,600
United States [Member]
Concentration Risk [Line Items]
Property and equipment, net	3,100	2,000
Asia Pacific [Member]
Concentration Risk [Line Items]
Property and equipment, net	5,600	2,400
Europe [Member]
Concentration Risk [Line Items]
Property and equipment, net	$ 1,500	$ 1,100

Segment Reporting - Company's Revenue by Geographic Region Based on Bill-to Location (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Revenue from External Customer [Line Items]
Total revenue	$ 331,856	$ 222,990	$ 228,732
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	209,044	139,327	137,946
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	81,480	57,270	66,867
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	17,823	9,415	11,134
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	18,191	10,304	8,402
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 5,318	$ 6,674	$ 4,383

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

+ Details

Financial Instruments and Fair Value - Schedule of Fair Value of Financial Instruments Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	$ 20	$ 214,802
Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	20	171
Commercial paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	66,181
Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	103,081
Asset-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	15,904
U.S. government securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	29,465
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	20	171
Level 1 [Member] \| Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	20	171
Level 1 [Member] \| Commercial paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	0
Level 1 [Member] \| Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	0
Level 1 [Member] \| Asset-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	0
Level 1 [Member] \| U.S. government securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	214,631
Level 2 [Member] \| Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	0
Level 2 [Member] \| Commercial paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	66,181
Level 2 [Member] \| Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	103,081
Level 2 [Member] \| Asset-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	15,904
Level 2 [Member] \| U.S. government securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	29,465
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	0
Level 3 [Member] \| Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	0
Level 3 [Member] \| Commercial paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	0
Level 3 [Member] \| Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	0
Level 3 [Member] \| Asset-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	0	0
Level 3 [Member] \| U.S. government securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	$ 0	$ 0