0001564590-22-031282 | 10-Q | XBRL Viewer

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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jul. 31, 2022	Aug. 31, 2022
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2022
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Trading Symbol	AMBA
Entity Registrant Name	AMBARELLA, INC.
Entity Central Index Key	0001280263
Current Fiscal Year End Date	--01-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		38,416,764
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
Document Quarterly Report	true
Document Transition Report	false
Title of 12(b) Security	Ordinary Shares, $0.00045 Par Value Per Share
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022
Current assets:
Cash and cash equivalents	$ 194,944	$ 171,043
Marketable debt securities	2,970	0
Accounts receivable, net	37,698	44,307
Inventories	40,103	45,219
Restricted cash	10	10
Prepaid expenses and other current assets	7,138	6,169
Total current assets	282,863	266,748
Property and equipment, net	10,443	10,134
Deferred tax assets, non-current	14,159	15,340
Intangible assets, net	49,563	46,302
Operating lease right-of-use assets, net	10,263	11,127
Goodwill	303,625	303,625
Other non-current assets	3,504	4,269
Total assets	674,420	657,545
Current liabilities:
Accounts payable	22,074	31,170
Accrued and other current liabilities	48,396	52,064
Operating lease liabilities, current	3,506	3,391
Income taxes payable	3,110	1,245
Deferred revenue, current	457	1,414
Total current liabilities	77,543	89,284
Operating lease liabilities, non-current	7,024	8,322
Other long-term liabilities	11,742	12,763
Total liabilities	96,309	110,369
Commitments and contingencies (Note 13)	0	0
Shareholders' equity:
Preference shares, $0.00045 par value per share, 20,000,000 shares authorized and no shares issued and outstanding at July 31, 2022 and January 31, 2022, respectively	0	0
Ordinary shares, $0.00045 par value per share, 200,000,000 shares authorized; 38,406,451 and 37,302,818 shares issued and outstanding at July 31, 2022 and January 31, 2022, respectively	17	17
Additional paid-in capital	512,696	447,287
Accumulated other comprehensive loss	(2)	0
Retained earnings	65,400	99,872
Total shareholders’ equity	578,111	547,176
Total liabilities and shareholders' equity	$ 674,420	$ 657,545

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jul. 31, 2022	Jan. 31, 2022
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	38,406,451	37,302,818
Ordinary shares, shares outstanding	38,406,451	37,302,818

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Income Statement [Abstract]
Revenue	$ 80,884	$ 79,327	$ 171,189	$ 149,460
Cost of revenue	29,820	29,908	63,578	56,276
Gross profit	51,064	49,419	107,611	93,184
Operating expenses:
Research and development	52,338	39,558	99,028	77,432
Selling, general and administrative	18,914	15,821	39,269	31,848
Total operating expenses	71,252	55,379	138,297	109,280
Loss from operations	(20,188)	(5,960)	(30,686)	(16,096)
Other income (expense), net	(26)	218	60	811
Loss before income taxes	(20,214)	(5,742)	(30,626)	(15,285)
Provision for income taxes	3,436	1,414	3,846	2,689
Net loss	$ (23,650)	$ (7,156)	$ (34,472)	$ (17,974)
Net loss per share attributable to ordinary shareholders:
Basic	$ (0.62)	$ (0.20)	$ (0.91)	$ (0.50)
Diluted	$ (0.62)	$ (0.20)	$ (0.91)	$ (0.50)
Weighted-average shares used to compute net loss per share attributable to ordinary shareholders:
Basic	38,258,341	36,442,536	37,986,839	36,191,420
Diluted	38,258,341	36,442,536	37,986,839	36,191,420

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (23,650)	$ (7,156)	$ (34,472)	$ (17,974)
Other comprehensive loss, net of tax:
Net unrealized losses on investments	(2)	(184)	(2)	(611)
Other comprehensive loss, net of tax	(2)	(184)	(2)	(611)
Comprehensive loss	$ (23,652)	$ (7,340)	$ (34,474)	$ (18,585)

- 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

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - 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, 2021	$ 474,976	$ 16	$ 347,458	$ 1,219	$ 126,283
Beginning Balance, Shares at Jan. 31, 2021		35,547,440
Issuance of shares through employee equity plans, Amount	6,741	$ 0	6,741	0	0
Issuance of shares through employee equity plans, Shares		643,120
Issuance of shares through employee stock purchase plan, Amount	3,694	$ 0	3,694	0	0
Issuance of shares through employee stock purchase plan, Shares		82,783
Stock-based compensation expense	17,128	$ 0	17,128	0	0
Net unrealized losses on investments - net of tax	(427)	0	0	(427)	0
Net loss	(10,818)	0	0	0	(10,818)
Ending Balance, Amount at Apr. 30, 2021	491,294	$ 16	375,021	792	115,465
Ending Balance, Shares at Apr. 30, 2021		36,273,343
Beginning Balance, Amount at Jan. 31, 2021	474,976	$ 16	347,458	1,219	126,283
Beginning Balance, Shares at Jan. 31, 2021		35,547,440
Net unrealized losses on investments - net of tax	(611)
Net loss	(17,974)
Ending Balance, Amount at Jul. 31, 2021	503,054	$ 16	394,121	608	108,309
Ending Balance, Shares at Jul. 31, 2021		36,644,636
Beginning Balance, Amount at Apr. 30, 2021	491,294	$ 16	375,021	792	115,465
Beginning Balance, Shares at Apr. 30, 2021		36,273,343
Issuance of shares through employee equity plans, Amount	1,461	$ 0	1,461	0	0
Issuance of shares through employee equity plans, Shares		371,293
Stock-based compensation expense	17,639	$ 0	17,639	0	0
Net unrealized losses on investments - net of tax	(184)	0	0	(184)	0
Net loss	(7,156)	0	0	0	(7,156)
Ending Balance, Amount at Jul. 31, 2021	503,054	$ 16	394,121	608	108,309
Ending Balance, Shares at Jul. 31, 2021		36,644,636
Beginning Balance, Amount at Jan. 31, 2022	$ 547,176	$ 17	447,287		99,872
Beginning Balance, Shares at Jan. 31, 2022	37,302,818	37,302,818
Issuance of shares through employee equity plans, Amount	$ 8,589	$ 0	8,589	0	0
Issuance of shares through employee equity plans, Shares		736,516
Issuance of shares through employee stock purchase plan, Amount	3,250	$ 0	3,250	0	0
Issuance of shares through employee stock purchase plan, Shares		43,545
Stock-based compensation expense	26,155	$ 0	26,155	0	0
Net loss	(10,822)	0	0	0	(10,822)
Ending Balance, Amount at Apr. 30, 2022	574,348	$ 17	485,281		89,050
Ending Balance, Shares at Apr. 30, 2022		38,082,879
Beginning Balance, Amount at Jan. 31, 2022	$ 547,176	$ 17	447,287		99,872
Beginning Balance, Shares at Jan. 31, 2022	37,302,818	37,302,818
Net unrealized losses on investments - net of tax	$ (2)
Net loss	(34,472)
Ending Balance, Amount at Jul. 31, 2022	$ 578,111	$ 17	512,696	(2)	65,400
Ending Balance, Shares at Jul. 31, 2022	38,406,451	38,406,451
Beginning Balance, Amount at Apr. 30, 2022	$ 574,348	$ 17	485,281		89,050
Beginning Balance, Shares at Apr. 30, 2022		38,082,879
Issuance of shares through employee equity plans, Amount	1,204	$ 0	1,204	0	0
Issuance of shares through employee equity plans, Shares		323,572
Stock-based compensation expense	26,211	$ 0	26,211	0	0
Net unrealized losses on investments - net of tax	(2)	0	0	(2)	0
Net loss	(23,650)	0	0	0	(23,650)
Ending Balance, Amount at Jul. 31, 2022	$ 578,111	$ 17	$ 512,696	$ (2)	$ 65,400
Ending Balance, Shares at Jul. 31, 2022	38,406,451	38,406,451

- Definition

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

+ References

+ Details

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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+ Details

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Cash flows from operating activities:
Net loss	$ (34,472)	$ (17,974)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	9,295	5,803
Amortization (accretion) of premium (discount) on marketable debt securities, net		852
Stock-based compensation	53,950	38,214
Deferred income taxes	1,181	215
Other non-cash items, net	42	13
Changes in operating assets and liabilities:
Accounts receivable	6,609	(13,321)
Inventories	5,116	(15,995)
Prepaid expenses and other current assets	(753)	1,033
Other non-current assets	765	435
Accounts payable	(11,873)	11,992
Accrued and other current liabilities	4,380	(619)
Income taxes payable	1,865	764
Deferred revenue	(957)	58
Operating lease liabilities	(2,159)	(1,763)
Other long-term liabilities	14	183
Net cash provided by operating activities	33,003	9,890
Cash flows from investing activities:
Purchase of investments	(2,972)	(101,664)
Escrow claim associated with business acquisition	749
Sales of investments		32,839
Maturities of investments		75,490
Purchase of tangible and intangible assets	(8,088)	(3,754)
Net cash provided by (used in) investing activities	(10,311)	2,911
Cash flows from financing activities:
Proceeds from exercise of stock options and employee stock purchase plan	4,087	7,161
Long-term financing payment for intangible assets	(2,878)	(2,834)
Net cash provided by financing activities	1,209	4,327
Net increase in cash, cash equivalents and restricted cash	23,901	17,128
Cash, cash equivalents and restricted cash at beginning of period	171,053	241,284
Cash, cash equivalents and restricted cash at end of period	194,954	258,412
Supplemental disclosure of cash flow information:
Cash paid for income taxes	661	1,085
Supplemental disclosure of noncash investing and financing activities:
Unpaid liabilities related to tangible and intangible assets purchases	$ 3,647	$ 1,332

Organization and Summary of Significant Accounting Policies

6 Months Ended

Jul. 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 powerful 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. These low power SoCs deliver exceptional video and image quality and can extract valuable data from high-resolution video and radar streams. The Company is currently addressing a broad range of human and computer vision applications, including video security, 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 Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared by the Company in accordance with the instructions to Form 10-Q pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) and, therefore, do not include all information and notes normally provided in audited financial statements. The accounting policies are described in the “Notes to Consolidated Financial Statements” in the Annual Report on Form 10-K for the 2022 fiscal year filed with the SEC on April 1, 2022 (the “Form 10-K”) and updated, as necessary, in this Form 10-Q. The year-end condensed consolidated balance sheet data presented for comparative purposes was derived from audited financial statements, but does not include all disclosures required by generally accepted accounting principles in the United States (“U.S. GAAP”). In the opinion of management, all adjustments (consisting of normal recurring accruals and adjustments) considered necessary for a fair statement have been included. The results of operations for any interim period are not necessarily indicative of, nor comparable to, the results of operations for any other interim period or for a full fiscal year. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes contained in the Form 10-K.

Basis of Consolidation

The Company’s fiscal year ends on January 31. The condensed consolidated financial statements of the Company and its subsidiaries have been prepared in conformity with U.S. GAAP. All intercompany transactions and balances have been eliminated upon consolidation.

Significant Accounting Policies

There have been no material changes to the Company’s significant accounting policies described in Note 1 - Organization and Summary of Significant Accounting Policies, of the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 31, 2022.

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 WT, 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 14 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 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.

Restricted Cash

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

	As of
	July 31, 2022		January 31, 2022		July 31, 2021		January 31, 2021
	(in thousands)
Cash and cash equivalents	$	194,944	$	171,043	$	258,402	$	241,274
Restricted cash		10		10		10		10
Total as presented in the condensed consolidated statements of cash flows	$	194,954	$	171,053	$	258,412	$	241,284

Recent Accounting Pronouncements

None.

Financial Instruments and Fair Value

6 Months Ended

Jul. 31, 2022

Investments All Other Investments [Abstract]

Financial Instruments and Fair Value

2. Financial Instruments and Fair Value

In July 2022, the Company invested $100.0 million of cash in money market funds and debt securities of corporations after a full liquidation of its debt security investments in fiscal year 2022. All of the investments are denominated in United States dollars and reported at fair value as available-for-sale securities in the condensed consolidated balance sheets as follows:

	As of July 31, 2022
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
Money market funds	$	97,068	$	—	$	—		$	97,068
Corporate bonds		2,972		—		(2	)		2,970
Total cash equivalents and marketable debt securities	$	100,040	$	—	$	(2	)	$	100,038

	As of January 31, 2022
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
Money market funds	$	20	$	—	$	—		$	20
Total cash equivalents and marketable debt securities	$	20	$	—	$	—		$	20

As of July 31, 2022, there were no debt securities with unrealized losses for more than twelve months.

	As of
	July 31, 2022		January 31, 2022
	(in thousands)
Included in cash equivalents	$	97,068	$	20
Included in marketable debt securities		2,970		—
Total cash equivalents and marketable debt securities	$	100,038	$	20

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

	As of
	July 31, 2022		January 31, 2022
	(in thousands)
Due within one year	$	100,038	$	20
Due within one to three years		—		—
Total cash equivalents and marketable debt securities	$	100,038	$	20

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 (expense), net in the condensed 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 loss in the condensed consolidated balance sheets. The credit-related losses were not material for the three and six months ended July 31, 2022, and 2021, respectively.

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 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 assets in active markets and are classified within Level 2.

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

	As of July 31, 2022
	Total		Level 1		Level 2		Level 3
	(in thousands)
Money market funds	$	97,068	$	97,068	$	—	$	—
Corporate bonds		2,970		—		2,970		—
Total cash equivalents and marketable debt securities	$	100,038	$	97,068	$	2,970	$	—

	As of January 31, 2022
	Total		Level 1		Level 2		Level 3
	(in thousands)
Money market funds	$	20	$	20	$	—	$	—
Total cash equivalents and marketable debt securities	$	20	$	20	$	—	$	—

Inventories

6 Months Ended

Jul. 31, 2022

Inventory Disclosure [Abstract]

Inventories

3. Inventories

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

	As of
	July 31, 2022		January 31, 2022
	(in thousands)
Work-in-progress	$	25,990	$	25,844
Finished goods		14,113		19,375
Total	$	40,103	$	45,219

Property and Equipment, Net

6 Months Ended

Jul. 31, 2022

Property Plant And Equipment [Abstract]

Property and Equipment, Net

4. Property and Equipment, Net

Depreciation expense was approximately $0.9 million and $0.6 million for the three months ended July 31, 2022 and 2021, respectively, and was approximately $1.8 million and $1.2 million for the six months ended July 31, 2022 and 2021, respectively. Property and equipment at July 31, 2022 and January 31, 2022 consisted of the following:

	As of
	July 31, 2022			January 31, 2022
	(in thousands)
Computer hardware and software	$	18,083		$	16,488
Tools and equipment		7,728			7,532
Furniture and fixtures		1,256			1,243
Leasehold improvements		3,080			2,942
Construction in progress		1,052			1,060
		31,199			29,265
Less: accumulated depreciation and amortization		(20,756	)		(19,131	)
Total property and equipment, net	$	10,443		$	10,134

Intangible Assets, Net

6 Months Ended

Jul. 31, 2022

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets, Net

5. Intangible Assets, Net

As of July 31, 2022, intangible assets primarily consist of software licenses as well as developed technology, customer relationships and trade name that were acquired from business combinations.

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 July 31, 2022, $4.0 million was recorded in accrued and other current liabilities and $0.6 million was recorded in other long-term liabilities in the condensed consolidated balance sheets.

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

	As of July 31, 2022							As of January 31, 2022
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	(in thousands)
Software licenses	$	30,563	$	(14,116	)	$	16,447	$	22,093	$	(11,331	)	$	10,762
Developed technology		21,200		(2,418	)		18,782		21,200		(904	)		20,296
Customer relationships		13,200		(1,099	)		12,101		13,200		(367	)		12,833
Trade name		2,500		(267	)		2,233		2,500		(89	)		2,411
Total intangible assets, net	$	67,463	$	(17,900	)	$	49,563	$	58,993	$	(12,691	)	$	46,302

During the six months ended July 31, 2022, there were approximately $8.9 million of software licenses purchased and approximately $0.4 million of software licenses retired. The amortization expense associated with software licenses was approximately $

1.6 million and $1.5 million for the three months ended July 31, 2022 and 2021, respectively, and was approximately $3.2 million and $3.0 million for the six months ended July 31, 2022 and 2021, respectively. The amortization expense associated with acquisition-related intangible assets, including developed technology, customer relationships and trade name, was approximately $1.2 million for the three months ended July 31, 2022 and $2.4 million for the six months ended July 31, 2022. There was no acquisition-related amortization expense for the three and six months ended July 31, 2021. The expected future amortization expense related to these intangible assets as of July 31, 2022 is as follows:

	As of
	July 31, 2022
Fiscal Year	(in thousands)
2023 (6 months remaining)	$	5,268
2024		8,625
2025		7,110
2026		5,757
2027		5,711
Thereafter		17,092
Total future amortization expenses:	$	49,563

Intangible assets are tested for impairment at least annually, in the fourth fiscal quarter, or more frequently if events or changes in circumstances indicate that the assets may be impaired. There were no intangible asset impairments for the three and six months ended July 31, 2022 and 2021, respectively.

Accrued and Other Current Liabilities

6 Months Ended

Jul. 31, 2022

Payables And Accruals [Abstract]

Accrued and Other Current Liabilities

6. Accrued and Other Current Liabilities

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

	As of
	July 31, 2022		January 31, 2022
	(in thousands)
Accrued employee compensation	$	24,207	$	30,044
Accrued product development costs		12,473		10,523
Software license liabilities, current		4,012		6,001
Other accrued liabilities		7,704		5,496
Total accrued and other current liabilities	$	48,396	$	52,064

The timing of SoC development and payments to outside foundries resulted in the fluctuation of accrued product development costs. Approximately $10.9 million of annual bonus was paid in the first quarter of fiscal year 2023, of which $3.2 million was paid in cash and $7.7 million was settled with restricted stock units.

Leases

6 Months Ended

Jul. 31, 2022

Leases [Abstract]

Leases

7. Leases

The Company enters into various operating leases for its worldwide facilities. In the second quarter of fiscal year 2023, the Company extended leases for its Shenzhen office and one of its facilities in Santa Clara, California for an additional two years beginning October 1, 2022 to September 30, 2024. For the lease extensions, the Company recorded an increase to the operating lease right-of-use (ROU) assets and corresponding operating lease liabilities of approximately $0.8 million in the condensed consolidated balance sheets.

Operating lease expense was approximately $0.9 million and $0.8 million for the three months ended July 31, 2022 and 2021, respectively, and was approximately $1.8 million and $1.6 million for the six months ended July 31, 2022 and 2021, respectively. The Company's short-term leases and finance leases were not material as of July 31, 2022 and January 31, 2022, respectively.

Supplemental cash flow information related to the operating leases is as follows:

	Three Months Ended		Six Months Ended
	July 31, 2022		July 31, 2022
	(in thousands)
Cash paid for operating leases included in operating cash flows	$	1,090	$	2,159
Supplemental non-cash information related to lease liabilities arising from obtaining right-of-use assets	$	83	$	170
Leased assets obtained in exchange for operating lease liabilities arising from lease modifications	$	810	$	810

As of July 31, 2022, the weighted average remaining lease term is 3.09 years, and the weighted average discount rate is 3.57 percent. Future minimum lease payments for the lease liabilities are as follows:

	As of
	July 31, 2022
Fiscal Year	(in thousands)
2023 (6 months remaining)	$	1,881
2024		3,797
2025		3,467
2026		1,416
2027		340
Thereafter		119
Total future annual minimum lease payments		11,020
Less: interest		(490	)
Total lease liabilities	$	10,530

Other Long-Term Liabilities

6 Months Ended

Jul. 31, 2022

Other Liabilities Disclosure [Abstract]

Other Long-Term Liabilities

8. Other Long-Term Liabilities

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

	As of
	July 31, 2022		January 31, 2022
	(in thousands)
Unrecognized tax benefits, including interest	$	9,548	$	9,313
Deferred tax liabilities, non-current		1,551		1,769
Software license liabilities, non-current		638		1,674
Other long-term liabilities		5		7
Total other long-term liabilities	$	11,742	$	12,763

Capital Stock

6 Months Ended

Jul. 31, 2022

Equity [Abstract]

Capital Stock

9. Capital Stock

Preference shares

After completion of the Company’s initial public offering in 2012, 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 July 31, 2022 and January 31, 2022, respectively.

Ordinary shares

As of July 31, 2022 and January 31, 2022, a total of 200,000,000 ordinary shares were authorized.

In the first quarter of fiscal year 2023, the Company added 466,285 ordinary shares to the ordinary shares reserved for issuance, pursuant to an “evergreen” provision contained in the Amended and Restated 2012 Employee Stock Purchase Plan, or ESPP. Pursuant to such provision, for 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 February 1^st of each fiscal year, or (iii) an amount determined by the Company’s Board of Directors or a duly authorized committee of the Board of Directors.

As of July 31, 2022 and January 31, 2022, the following ordinary shares were reserved for future issuance under the Company’s equity plans and ESPP:

	As of
	July 31, 2022		January 31, 2022
Shares reserved for options, restricted stock and restricted stock units under equity plans		6,399,750		7,461,541
Shares reserved for ESPP		3,047,444		2,624,704

Stock repurchase program

On May 27, 2022, the Company’ s Board of Directors approved an extension of the current share repurchase program for an additional twelve months ending June 30, 2023. There were no ordinary shares repurchased in the six months ended July 31, 2022. As of July 31, 2022, there was approximately $49.0 million available for repurchases under the current repurchase program through June 30, 2023. 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.

Stock-based Compensation

6 Months Ended

Jul. 31, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-based Compensation

10. Stock-based Compensation

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

	Three Months Ended July 31,				Six Months Ended July 31,
	2022		2021		2022		2021
	(in thousands)
Stock-based compensation:
Cost of revenue	$	362	$	359	$	711	$	682
Research and development		17,883		11,525		35,034		22,719
Selling, general and administrative		8,664		7,488		18,205		14,813
Total stock-based compensation	$	26,909	$	19,372	$	53,950	$	38,214

As of July 31, 2022, approximately $1.7 million of stock-based compensation expense was accrued and reflected under accrued and other current liabilities in the condensed consolidated balance sheets. Total unrecognized compensation cost related to unvested stock options at July 31, 2022 was $21.7 million and is expected to be recognized over a weighted-average period of 2.20 years. Total unrecognized compensation cost related to unvested restricted stock units at July 31, 2022 was $189.2 million and is expected to be recognized over a weighted-average period of 2.30 years. In April 2022, the Company’s Compensation Committee of the Board of Directors approved the acceleration of vesting of 35,703 shares of unvested equity awards associated with the departure of Mr. Casey Eichler, who was the Company’s Chief Financial Officer until March 2022. As a result, there was approximately $1.7 million of additional stock-based compensation expense, net related to the departure recognized in fiscal year 2023.

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:

	Three Months Ended July 31,					Six Months Ended July 31,
	2022		2021			2022			2021
Stock Options:
Volatility		—		50	%		—			51	%
Risk-free interest rate		—		0.85	%		—			0.98	%
Expected term (years)		—	5.06				—		5.27
Dividend yield		—		0	%		—			0	%
Employee stock purchase plan awards:
Volatility		—		—			89	%		61	%
Risk-free interest rate		—		—			0.86	%		0.06	%
Expected term (years)		—		—		0.5			0.5
Dividend yield		—		—			0	%		0	%

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

	Option Outstanding
										Weighted-
								Total Intrinsic		Average
						Weighted-		Value Of		Remaining		Aggregate
				Weighted-		Average		Options		Contractual		Intrinsic
				Average		Grant-date		Exercised		Term		Value
	Shares			Exercise Price		Fair Value		(in thousands)		(in years)		(in thousands)
Outstanding at January 31, 2022		619,322		$	40.08
Granted		—			—		—
Exercised		(64,395	)		32.20			$	3,878
Forfeited		(6,323	)		45.88
Expired		(518	)		10.89
Outstanding at July 31, 2022		548,086			40.97					4.68		$	25,303
Exercisable at July 31, 2022		386,400		$	43.27						3.59	$	16,853

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 ordinary shares on July 29, 2022 was $86.55, 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 ordinary shares on the exercise date and the exercise price.

The following table summarizes restricted stock unit activities for the period indicated:

				Weighted-
				Average
				Grant-Date
	Shares			Fair Value
Unvested at January 31, 2022		2,651,135		$	85.41
Granted		708,985			85.87
Vested		(995,693	)		68.42
Forfeited		(61,722	)		100.28
Unvested at July 31, 2022		2,302,705		$	92.87

As of July 31, 2022, the aggregate intrinsic value of unvested restricted stock units was $199.3 million.

Net Loss Per Ordinary Share

6 Months Ended

Jul. 31, 2022

Earnings Per Share [Abstract]

Net Loss Per Ordinary Share

11. Net Loss Per Ordinary Share

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

	Three Months Ended July 31,						Six Months Ended July 31,
	2022			2021			2022			2021
	(in thousands, except share and per share data)
Numerator:
Net loss	$	(23,650	)	$	(7,156	)	$	(34,472	)	$	(17,974	)
Denominator:
Weighted-average ordinary shares - basic		38,258,341			36,442,536			37,986,839			36,191,420
Weighted-average ordinary shares - diluted		38,258,341			36,442,536			37,986,839			36,191,420
Net loss per ordinary share:
Basic	$	(0.62	)	$	(0.20	)	$	(0.91	)	$	(0.50	)
Diluted	$	(0.62	)	$	(0.20	)	$	(0.91	)	$	(0.50	)

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

	Three Months Ended July 31,				Six Months Ended July 31,
	2022		2021		2022		2021
Options to purchase ordinary shares		328,198		367,880		370,069		397,871
Restricted stock units		1,463,284		1,528,946		1,620,052		1,657,599
Employee stock purchase plan		11,456		714		11,233		11,792
		1,802,938		1,897,540		2,001,354		2,067,262

Income Taxes

6 Months Ended

Jul. 31, 2022

Income Tax Disclosure [Abstract]

Income Taxes

12. Income Taxes

The following table provides details of income taxes for the periods indicated:

	Three Months Ended July 31,						Six Months Ended July 31,
	2022			2021			2022			2021
	(in thousands)
Loss before income taxes	$	(20,214	)	$	(5,742	)	$	(30,626	)	$	(15,285	)
Provision for income taxes		3,436			1,414			3,846			2,689
Effective tax rate	(17.0)%			(24.6)%			(12.6)%			(17.6)%

The Company recorded an income tax provision of $3.4 million and $1.4 million for the three months ended July 31, 2022 and 2021, and $3.8 million and $2.7 million for the six months ended July 31, 2022 and 2021, respectively. The increase in income tax expense for the three and six months ended July 31, 2022 was primarily due to a decrease in the U.S. federal research tax credit, a decrease in tax benefits from excess stock-based compensation deductions as well as an increase in non-deductible stock-based compensation, partially offset by a decrease in the proportion of profits generated in higher tax jurisdictions.

The Company files federal and state income tax returns in the United States and in various 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. As of July 31, 2022, the gross amount of unrecognized tax benefits was approximately $31.3 million. 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.

- 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
-Topic 740
-SubTopic 10
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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 8: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (SX 210.4-08(h)(2))
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+ Details

Commitments and Contingencies

6 Months Ended

Jul. 31, 2022

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

13. 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 July 31, 2022 and January 31, 2022, total manufacturing purchase commitments were approximately $68.3 million and $71.5 million, respectively. The Company also reviews and assesses the need for any expected loss liabilities on quarterly basis for all products that it does not expect to sell for which it has committed purchases from suppliers. As of July 31, 2022, an approximately $1.9 million loss was recognized in the condensed consolidated balance sheets from adverse purchase commitments. There were no material loss liabilities recorded in the condensed consolidated balance sheets from adverse purchase commitments as of January 31, 2022.

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 and product liability 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 condensed consolidated balance sheets as of July 31, 2022 and January 31, 2022, respectively.

Other Matters

From time to time, the Company is subject to commercial disputes, employment issues, intellectual property claims and litigation, in the ordinary course of its business. Although the ultimate disposition of asserted claims cannot be predicted with certainty, it is the Company’s belief that the outcome of any such claims, either individually or on a combined basis, will not have a material adverse effect on its consolidated financial position. The results of any litigation cannot be predicted with certainty, and regardless of the outcome, litigation can have an adverse impact on the Company because of defense and settlement costs, diversion of management resources, and other factors.

Segment Reporting

6 Months Ended

Jul. 31, 2022

Segment Reporting [Abstract]

Segment Reporting

14. 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:

	Three Months Ended July 31,				Six Months Ended July 31,
	2022		2021		2022		2021
	(in thousands)
Taiwan	$	49,805	$	49,136	$	103,441	$	93,723
Asia Pacific		17,844		20,162		39,399		38,799
Europe		4,479		4,387		12,872		7,405
North America other than United States		4,386		4,443		9,272		7,133
United States		4,370		1,199		6,205		2,400
Total revenue	$	80,884	$	79,327	$	171,189	$	149,460

As of July 31, 2022, substantially all of the Company’s property and equipment were located in the Asia Pacific region, United States and Europe with approximate net amounts of $5.3 million, $3.6 million and $1.6 million, respectively.

Major Customers

For the three and six months ended July 31, 2022, the customers representing 10% or more of revenue and accounts receivable were WT and Chicony, which accounted for approximately 59.4% and 12.9% of total revenue for the three months ended July 31, 2022, respectively, and accounted for approximately 57.9% and 12.1% of total revenue for the six months ended July 31, 2022, respectively. For the three and six months ended July 31, 2021, the customers representing 10% or more of revenue and accounts receivable were WT and Chicony, which accounted for approximately 61.6% and 15.8% of total revenue for the three months ended July 31, 2021, respectively, and accounted for approximately 62.4% and 15.8% of total revenue for the six months ended July 31, 2021, respectively. Accounts receivable with WT and Chicony were approximately $16.2 million and $10.5 million, respectively, as of July 31, 2022.

- 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
-Topic 280
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-Paragraph 31
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8924-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: 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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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/topic&trid=2134510

+ Details

Organization and Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jul. 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 Presentation

Basis of Consolidation

Concentration of Risk

Restricted Cash

	As of
	July 31, 2022		January 31, 2022		July 31, 2021		January 31, 2021
	(in thousands)
Cash and cash equivalents	$	194,944	$	171,043	$	258,402	$	241,274
Restricted cash		10		10		10		10
Total as presented in the condensed consolidated statements of cash flows	$	194,954	$	171,053	$	258,412	$	241,284

Recent Accounting Pronouncements

None.

Organization and Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jul. 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 condensed consolidated balance sheets, and the totals are presented on the condensed consolidated statements of cash flows:

	As of
	July 31, 2022		January 31, 2022		July 31, 2021		January 31, 2021
	(in thousands)
Cash and cash equivalents	$	194,944	$	171,043	$	258,402	$	241,274
Restricted cash		10		10		10		10
Total as presented in the condensed consolidated statements of cash flows	$	194,954	$	171,053	$	258,412	$	241,284

Financial Instruments and Fair Value (Tables)

6 Months Ended

Jul. 31, 2022

Investments All Other Investments [Abstract]

Schedule of Fair Value as Available-for-Sale Securities

All of the investments are denominated in United States dollars and reported at fair value as available-for-sale securities in the condensed consolidated balance sheets as follows:

	As of July 31, 2022
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
Money market funds	$	97,068	$	—	$	—		$	97,068
Corporate bonds		2,972		—		(2	)		2,970
Total cash equivalents and marketable debt securities	$	100,040	$	—	$	(2	)	$	100,038

	As of January 31, 2022
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
Money market funds	$	20	$	—	$	—		$	20
Total cash equivalents and marketable debt securities	$	20	$	—	$	—		$	20

Schedule of Cash Equivalents and Marketable Debt Securities

As of July 31, 2022, there were no debt securities with unrealized losses for more than twelve months.

	As of
	July 31, 2022		January 31, 2022
	(in thousands)
Included in cash equivalents	$	97,068	$	20
Included in marketable debt securities		2,970		—
Total cash equivalents and marketable debt securities	$	100,038	$	20

Summary of Contractual Maturities of Investments

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

	As of
	July 31, 2022		January 31, 2022
	(in thousands)
Due within one year	$	100,038	$	20
Due within one to three years		—		—
Total cash equivalents and marketable debt securities	$	100,038	$	20

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 July 31, 2022 and January 31, 2022, respectively:

	As of July 31, 2022
	Total		Level 1		Level 2		Level 3
	(in thousands)
Money market funds	$	97,068	$	97,068	$	—	$	—
Corporate bonds		2,970		—		2,970		—
Total cash equivalents and marketable debt securities	$	100,038	$	97,068	$	2,970	$	—

	As of January 31, 2022
	Total		Level 1		Level 2		Level 3
	(in thousands)
Money market funds	$	20	$	20	$	—	$	—
Total cash equivalents and marketable debt securities	$	20	$	20	$	—	$	—

Inventories (Tables)

6 Months Ended

Jul. 31, 2022

Inventory Disclosure [Abstract]

Schedule of Inventory

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

	As of
	July 31, 2022		January 31, 2022
	(in thousands)
Work-in-progress	$	25,990	$	25,844
Finished goods		14,113		19,375
Total	$	40,103	$	45,219

Property and Equipment, Net (Tables)

6 Months Ended

Jul. 31, 2022

Property Plant And Equipment [Abstract]

Schedule of Property and Equipment

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

	As of
	July 31, 2022			January 31, 2022
	(in thousands)
Computer hardware and software	$	18,083		$	16,488
Tools and equipment		7,728			7,532
Furniture and fixtures		1,256			1,243
Leasehold improvements		3,080			2,942
Construction in progress		1,052			1,060
		31,199			29,265
Less: accumulated depreciation and amortization		(20,756	)		(19,131	)
Total property and equipment, net	$	10,443		$	10,134

Intangible Assets, Net (Tables)

6 Months Ended

Jul. 31, 2022

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Components of Intangible Assets

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

	As of July 31, 2022							As of January 31, 2022
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	(in thousands)
Software licenses	$	30,563	$	(14,116	)	$	16,447	$	22,093	$	(11,331	)	$	10,762
Developed technology		21,200		(2,418	)		18,782		21,200		(904	)		20,296
Customer relationships		13,200		(1,099	)		12,101		13,200		(367	)		12,833
Trade name		2,500		(267	)		2,233		2,500		(89	)		2,411
Total intangible assets, net	$	67,463	$	(17,900	)	$	49,563	$	58,993	$	(12,691	)	$	46,302

Summary of Expected Future Amortization Expense Related to Intangible Assets

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

	As of
	July 31, 2022
Fiscal Year	(in thousands)
2023 (6 months remaining)	$	5,268
2024		8,625
2025		7,110
2026		5,757
2027		5,711
Thereafter		17,092
Total future amortization expenses:	$	49,563

Accrued and Other Current Liabilities (Tables)

6 Months Ended

Jul. 31, 2022

Payables And Accruals [Abstract]

Schedule of Accrued and Other Current Liabilities

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

	As of
	July 31, 2022		January 31, 2022
	(in thousands)
Accrued employee compensation	$	24,207	$	30,044
Accrued product development costs		12,473		10,523
Software license liabilities, current		4,012		6,001
Other accrued liabilities		7,704		5,496
Total accrued and other current liabilities	$	48,396	$	52,064

Leases (Tables)

6 Months Ended

Jul. 31, 2022

Leases [Abstract]

Schedule of Supplemental Cash Flow Information Related to Leases

Supplemental cash flow information related to the operating leases is as follows:

	Three Months Ended		Six Months Ended
	July 31, 2022		July 31, 2022
	(in thousands)
Cash paid for operating leases included in operating cash flows	$	1,090	$	2,159
Supplemental non-cash information related to lease liabilities arising from obtaining right-of-use assets	$	83	$	170
Leased assets obtained in exchange for operating lease liabilities arising from lease modifications	$	810	$	810

Schedule of Future Minimum Lease Payments for Lease Liabilities

	As of
	July 31, 2022
Fiscal Year	(in thousands)
2023 (6 months remaining)	$	1,881
2024		3,797
2025		3,467
2026		1,416
2027		340
Thereafter		119
Total future annual minimum lease payments		11,020
Less: interest		(490	)
Total lease liabilities	$	10,530

Other Long-Term Liabilities (Tables)

6 Months Ended

Jul. 31, 2022

Other Liabilities Disclosure [Abstract]

Schedule of Other Long-Term Liabilities

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

	As of
	July 31, 2022		January 31, 2022
	(in thousands)
Unrecognized tax benefits, including interest	$	9,548	$	9,313
Deferred tax liabilities, non-current		1,551		1,769
Software license liabilities, non-current		638		1,674
Other long-term liabilities		5		7
Total other long-term liabilities	$	11,742	$	12,763

Capital Stock (Tables)

6 Months Ended

Jul. 31, 2022

Equity [Abstract]

Schedule of Ordinary Shares Reserved for Future Issuance under Company's Equity Plans and ESPP

As of July 31, 2022 and January 31, 2022, the following ordinary shares were reserved for future issuance under the Company’s equity plans and ESPP:

	As of
	July 31, 2022		January 31, 2022
Shares reserved for options, restricted stock and restricted stock units under equity plans		6,399,750		7,461,541
Shares reserved for ESPP		3,047,444		2,624,704

Stock-based Compensation (Tables)

6 Months Ended

Jul. 31, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Classification of Stock-based Compensation

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

	Three Months Ended July 31,				Six Months Ended July 31,
	2022		2021		2022		2021
	(in thousands)
Stock-based compensation:
Cost of revenue	$	362	$	359	$	711	$	682
Research and development		17,883		11,525		35,034		22,719
Selling, general and administrative		8,664		7,488		18,205		14,813
Total stock-based compensation	$	26,909	$	19,372	$	53,950	$	38,214

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:

	Three Months Ended July 31,					Six Months Ended July 31,
	2022		2021			2022			2021
Stock Options:
Volatility		—		50	%		—			51	%
Risk-free interest rate		—		0.85	%		—			0.98	%
Expected term (years)		—	5.06				—		5.27
Dividend yield		—		0	%		—			0	%
Employee stock purchase plan awards:
Volatility		—		—			89	%		61	%
Risk-free interest rate		—		—			0.86	%		0.06	%
Expected term (years)		—		—		0.5			0.5
Dividend yield		—		—			0	%		0	%

Stock Option Activities

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

	Option Outstanding
										Weighted-
								Total Intrinsic		Average
						Weighted-		Value Of		Remaining		Aggregate
				Weighted-		Average		Options		Contractual		Intrinsic
				Average		Grant-date		Exercised		Term		Value
	Shares			Exercise Price		Fair Value		(in thousands)		(in years)		(in thousands)
Outstanding at January 31, 2022		619,322		$	40.08
Granted		—			—		—
Exercised		(64,395	)		32.20			$	3,878
Forfeited		(6,323	)		45.88
Expired		(518	)		10.89
Outstanding at July 31, 2022		548,086			40.97					4.68		$	25,303
Exercisable at July 31, 2022		386,400		$	43.27						3.59	$	16,853

Restricted Stock Unit Activities

The following table summarizes restricted stock unit activities for the period indicated:

				Weighted-
				Average
				Grant-Date
	Shares			Fair Value
Unvested at January 31, 2022		2,651,135		$	85.41
Granted		708,985			85.87
Vested		(995,693	)		68.42
Forfeited		(61,722	)		100.28
Unvested at July 31, 2022		2,302,705		$	92.87

Net Loss Per Ordinary Share (Tables)

6 Months Ended

Jul. 31, 2022

Earnings Per Share [Abstract]

Computation of Basic and Diluted Loss Per Ordinary Share

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

	Three Months Ended July 31,						Six Months Ended July 31,
	2022			2021			2022			2021
	(in thousands, except share and per share data)
Numerator:
Net loss	$	(23,650	)	$	(7,156	)	$	(34,472	)	$	(17,974	)
Denominator:
Weighted-average ordinary shares - basic		38,258,341			36,442,536			37,986,839			36,191,420
Weighted-average ordinary shares - diluted		38,258,341			36,442,536			37,986,839			36,191,420
Net loss per ordinary share:
Basic	$	(0.62	)	$	(0.20	)	$	(0.91	)	$	(0.50	)
Diluted	$	(0.62	)	$	(0.20	)	$	(0.91	)	$	(0.50	)

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

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

	Three Months Ended July 31,				Six Months Ended July 31,
	2022		2021		2022		2021
Options to purchase ordinary shares		328,198		367,880		370,069		397,871
Restricted stock units		1,463,284		1,528,946		1,620,052		1,657,599
Employee stock purchase plan		11,456		714		11,233		11,792
		1,802,938		1,897,540		2,001,354		2,067,262

Income Taxes (Tables)

6 Months Ended

Jul. 31, 2022

Income Tax Disclosure [Abstract]

Summary of Income Taxes

The following table provides details of income taxes for the periods indicated:

	Three Months Ended July 31,						Six Months Ended July 31,
	2022			2021			2022			2021
	(in thousands)
Loss before income taxes	$	(20,214	)	$	(5,742	)	$	(30,626	)	$	(15,285	)
Provision for income taxes		3,436			1,414			3,846			2,689
Effective tax rate	(17.0)%			(24.6)%			(12.6)%			(17.6)%

Segment Reporting (Tables)

6 Months Ended

Jul. 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:

	Three Months Ended July 31,				Six Months Ended July 31,
	2022		2021		2022		2021
	(in thousands)
Taiwan	$	49,805	$	49,136	$	103,441	$	93,723
Asia Pacific		17,844		20,162		39,399		38,799
Europe		4,479		4,387		12,872		7,405
North America other than United States		4,386		4,443		9,272		7,133
United States		4,370		1,199		6,205		2,400
Total revenue	$	80,884	$	79,327	$	171,189	$	149,460

Organization and Summary of Significant Accounting Policies - Schedule of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022	Jul. 31, 2021	Jan. 31, 2021
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 194,944	$ 171,043	$ 258,402	$ 241,274
Restricted cash	10	10	10	10
Total as presented in the condensed consolidated statements of cash flows	$ 194,954	$ 171,053	$ 258,412	$ 241,284

Financial Instruments and Fair Value - Schedule of Fair Value as Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 100,040	$ 20
Unrealized Gains	0	0
Unrealized Losses	(2)	0
Fair Value	100,038	20
Money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	97,068	20
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	97,068	$ 20
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,972
Unrealized Gains	0
Unrealized Losses	(2)
Fair Value	$ 2,970

Financial Instruments and Fair Value - Additional Information (Detail)	Jul. 31, 2022 Security
Investments Debt And Equity Securities [Abstract]
Number of debt securities with unrealized losses for more than twelve months	0

Financial Instruments And Fair Value - Schedule of Cash Equivalents and Marketable Debt Securities (Detail) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Total cash equivalents and marketable debt securities	$ 100,038	$ 20
Included in cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Total cash equivalents and marketable debt securities	97,068	20
Included in marketable debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total cash equivalents and marketable debt securities	$ 2,970	$ 0

Financial Instruments and Fair Value - Summary of Contractual Maturities of Investments (Detail) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022
Available For Sale Securities Debt Maturities Fair Value [Abstract]
Due within one year	$ 100,038	$ 20
Due within one to three years	0	0
Total cash equivalents and marketable debt securities	$ 100,038	$ 20

Financial Instruments and Fair Value - Schedule of Fair Value of Financial Instruments Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	$ 100,038	$ 20
Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	97,068	20
Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	2,970
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	97,068	20
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	97,068	20
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
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	2,970	0
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] \| Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	2,970
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] \| Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents and marketable debt securities	$ 0

Inventories - Schedule of Inventory (Detail) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022
Inventory Disclosure [Abstract]
Work-in-progress	$ 25,990	$ 25,844
Finished goods	14,113	19,375
Total	$ 40,103	$ 45,219

Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Property Plant And Equipment [Abstract]
Depreciation of property and equipment	$ 0.9	$ 0.6	$ 1.8	$ 1.2

Property and Equipment, Net - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 31,199	$ 29,265
Less: accumulated depreciation and amortization	(20,756)	(19,131)
Total property and equipment, net	10,443	10,134
Computer hardware and software [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	18,083	16,488
Tools and equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	7,728	7,532
Furniture and fixtures [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,256	1,243
Leasehold improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	3,080	2,942
Construction in progress [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 1,052	$ 1,060

Intangible Assets, Net - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021	Jan. 31, 2022
Finite Lived Intangible Assets [Line Items]
Liabilities associated with software license at net present value, current	$ 4,012,000		$ 4,012,000		$ 6,001,000
Liabilities associated with software license at net present value, non-current	638,000		638,000		$ 1,674,000
Amortization expense associate with acquisition-related intangible assets	1,200,000	$ 0	2,400,000	$ 0
Impairment of intangible assets	0	0	0	0
Internal-use software licenses [Member]
Finite Lived Intangible Assets [Line Items]
Software licenses purchased			8,900,000
Fully amortized software licenses retired			400,000
Amortization expense	$ 1,600,000	$ 1,500,000	$ 3,200,000	$ 3,000,000.0

Intangible Assets, Net - Summary of Components of Intangible Assets (Detail) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 67,463	$ 58,993
Accumulated Amortization	(17,900)	(12,691)
Net Carrying Amount	49,563	46,302
Software licenses [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	30,563	22,093
Accumulated Amortization	(14,116)	(11,331)
Net Carrying Amount	16,447	10,762
Developed technology [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	21,200	21,200
Accumulated Amortization	(2,418)	(904)
Net Carrying Amount	18,782	20,296
Customer relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,200	13,200
Accumulated Amortization	(1,099)	(367)
Net Carrying Amount	12,101	12,833
Trade Name [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,500	2,500
Accumulated Amortization	(267)	(89)
Net Carrying Amount	$ 2,233	$ 2,411

Intangible Assets, Net - Summary of Expected Future Amortization Expense Related to Intangible Assets (Detail) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022
Goodwill And Intangible Assets Disclosure [Abstract]
2023 (6 months remaining)	$ 5,268
2024	8,625
2025	7,110
2026	5,757
2027	5,711
Thereafter	17,092
Net Carrying Amount	$ 49,563	$ 46,302

Accrued and Other Current Liabilities - Schedule of Accrued and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022
Payables And Accruals [Abstract]
Accrued employee compensation	$ 24,207	$ 30,044
Accrued product development costs	12,473	10,523
Software license liabilities, current	4,012	6,001
Other accrued liabilities	7,704	5,496
Total accrued and other current liabilities	$ 48,396	$ 52,064

Accrued and Other Current Liabilities - Additional Information (Detail) $ in Millions	6 Months Ended
	Jul. 31, 2022 USD ($)
Schedule of Accrued Liabilities [Line Items]
Annual bonus paid	$ 10.9
Cash [Member]
Schedule of Accrued Liabilities [Line Items]
Annual bonus paid	3.2
Restricted stock units [Member]
Schedule of Accrued Liabilities [Line Items]
Annual bonus paid	$ 7.7

Leases - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
Leases - Additional Information (Detail) $ in Millions	Jul. 31, 2022 USD ($) Facility	Jul. 31, 2021 USD ($)	Jul. 31, 2022 USD ($) Facility	Jul. 31, 2021 USD ($)
Lessee Lease Description [Line Items]
Operating lease expense	$ 0.9	$ 0.8	$ 1.8	$ 1.6
Weighted-average remaining lease term – operating leases	3 years 1 month 2 days		3 years 1 month 2 days
Weighted-average discount rate – operating leases	3.57%		3.57%
Extended Operating Lease [Member]
Lessee Lease Description [Line Items]
Increase to operating lease right-of-use assets (ROU)			$ 0.8
Increase to operating lease liabilities			$ 0.8
Shenzhen Operating Lease [Member] \| Extended Operating Lease [Member]
Lessee Lease Description [Line Items]
Inception date	Oct. 01, 2022
Expiration date	Sep. 30, 2024
Lease term	2 years		2 years
Santa Clara Operating Lease [Member] \| Extended Operating Lease [Member]
Lessee Lease Description [Line Items]
Inception date	Oct. 01, 2022
Expiration date	Sep. 30, 2024
Lease term	2 years		2 years
Number of lease facility \| Facility	1		1

Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 31, 2022	Jul. 31, 2022
Leases [Abstract]
Cash paid for operating leases included in operating cash flows	$ 1,090	$ 2,159
Supplemental non-cash information related to lease liabilities arising from obtaining right-of-use assets	83	170
Leased assets obtained in exchange for operating lease liabilities arising from lease modifications	$ 810	$ 810

Leases - Schedule of Future Minimum Lease Payments for Lease Liabilities (Detail) $ in Thousands	Jul. 31, 2022 USD ($)
Leases [Abstract]
2023 (6 months remaining)	$ 1,881
2024	3,797
2025	3,467
2026	1,416
2027	340
Thereafter	119
Total future annual minimum lease payments	11,020
Less: interest	(490)
Total lease liabilities	$ 10,530

Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Detail) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022
Other Liabilities Disclosure [Abstract]
Unrecognized tax benefits, including interest	$ 9,548	$ 9,313
Deferred tax liabilities, non-current	1,551	1,769
Software license liabilities, non-current	638	1,674
Other long-term liabilities	5	7
Total other long-term liabilities	$ 11,742	$ 12,763

Capital Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	6 Months Ended
	May 27, 2022	Apr. 30, 2022	Jul. 31, 2022	Jan. 31, 2022
Class Of Stock [Line Items]
Preference shares, shares authorized			20,000,000	20,000,000
Preference shares, par value			$ 0.00045	$ 0.00045
Preference shares, shares issued			0	0
Preference shares, shares outstanding			0	0
Ordinary shares, shares authorized			200,000,000	200,000,000
ESPP [Member]
Class Of Stock [Line Items]
Additional ordinary shares reserved for issuance		466,285
ESPP [Member] \| Scenario, plan automatically increased by the lessor of [Member]
Class Of Stock [Line Items]
Annual increase in ordinary shares for available for future issuance		1,500,000
Annual shares increase for future issuance by percentage under 2012 employee stock purchase plan		1.25%
Stock Repurchase Program [Member]
Class Of Stock [Line Items]
Stock repurchase program, authorization date	May 27, 2022
Stock repurchased, shares			0
Stock repurchase program, extended expiration period	12 months
Stock repurchase program, extended expiration date	Jun. 30, 2023
Amount available under stock repurchase program			$ 49.0

Capital Stock - Schedule of Ordinary Shares Reserved for Future Issuance under Company's Equity Plans and ESPP (Detail) - shares	Jul. 31, 2022	Jan. 31, 2022
Equity Plans [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved	6,399,750	7,461,541
ESPP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved	3,047,444	2,624,704

Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Stock-based compensation:
Total stock-based compensation	$ 26,909	$ 19,372	$ 53,950	$ 38,214
Cost of revenue [Member]
Stock-based compensation:
Total stock-based compensation	362	359	711	682
Research and development [Member]
Stock-based compensation:
Total stock-based compensation	17,883	11,525	35,034	22,719
Selling, general and administrative [Member]
Stock-based compensation:
Total stock-based compensation	$ 8,664	$ 7,488	$ 18,205	$ 14,813

Stock-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	6 Months Ended	12 Months Ended
	Apr. 30, 2022	Jul. 31, 2022	Jan. 31, 2023	Jul. 29, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Accrued stock-based compensation expense liabilities		$ 1.7
Closing price of ordinary shares				$ 86.55
Mr. Casey Eichler [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Acceleration of vesting of shares of unvested equity awards	35,703
Mr. Casey Eichler [Member] \| Scenario Forecast [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional stock-based compensation expense, net related to departure recognized			$ 1.7
Stock options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost, stock options		$ 21.7
Weighted average recognition period		2 years 2 months 12 days
Restricted stock units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost, restricted stock units		$ 189.2
Weighted average recognition period		2 years 3 months 18 days
Aggregate intrinsic value of unvested restricted stock units		$ 199.3

Stock-based Compensation - Weighted-Average Assumptions Used to Estimate Fair Value (Detail)	3 Months Ended	6 Months Ended
	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Stock options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Volatility	50.00%		51.00%
Risk-free interest rate	0.85%		0.98%
Expected term (years)	5 years 21 days		5 years 3 months 7 days
Dividend yield	0.00%		0.00%
Employee stock purchase plan awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Volatility		89.00%	61.00%
Risk-free interest rate		0.86%	0.06%
Expected term (years)		6 months	6 months
Dividend yield		0.00%	0.00%

Stock-based Compensation - Stock Option Activities (Detail) $ / shares in Units, $ in Thousands	6 Months Ended
	Jul. 31, 2022 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Outstanding \| shares	619,322
Shares, Exercised \| shares	(64,395)
Shares, Forfeited \| shares	(6,323)
Shares, Expired \| shares	(518)
Shares, Outstanding \| shares	548,086
Shares, Exercisable \| shares	386,400
Weighted-Average Exercise Price, Outstanding \| $ / shares	$ 40.08
Weighted-Average Exercise Price, Exercised \| $ / shares	32.20
Weighted-Average Exercise Price, Forfeited \| $ / shares	45.88
Weighted-Average Exercise Price, Expired \| $ / shares	10.89
Weighted-Average Exercise Price, Outstanding \| $ / shares	40.97
Weighted-Average Exercise Price, Exercisable \| $ / shares	$ 43.27
Total Intrinsic Value Of Options Exercised \| $	$ 3,878
Weighted-Average Remaining Contractual Term, Outstanding	4 years 8 months 4 days
Weighted-Average Remaining Contractual Term, Exercisable	3 years 7 months 2 days
Aggregate Intrinsic Value, Outstanding \| $	$ 25,303
Aggregate Intrinsic Value, Exercisable \| $	$ 16,853

Stock-based Compensation - Restricted Stock Unit Activities (Detail) - Restricted Stock Unit [Member]	6 Months Ended
	Jul. 31, 2022 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Unvested, beginning balance \| shares	2,651,135
Shares, Granted \| shares	708,985
Shares, Vested \| shares	(995,693)
Shares, Forfeited \| shares	(61,722)
Shares, Unvested, ending balance \| shares	2,302,705
Weighted-Average Grant-Date Fair Value, Unvested, beginning balance \| $ / shares	$ 85.41
Weighted-Average Grant-Date Fair Value, Granted \| $ / shares	85.87
Weighted-Average Grant-Date Fair Value, Vested \| $ / shares	68.42
Weighted-Average Grant-Date Fair Value, Forfeited \| $ / shares	100.28
Weighted-Average Grant-Date Fair Value, Unvested, ending balance \| $ / shares	$ 92.87

Net Loss Per Ordinary Share - Computation of Basic and Diluted Loss Per Ordinary Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jul. 31, 2022	Apr. 30, 2022	Jul. 31, 2021	Apr. 30, 2021	Jul. 31, 2022	Jul. 31, 2021
Numerator:
Net loss	$ (23,650)	$ (10,822)	$ (7,156)	$ (10,818)	$ (34,472)	$ (17,974)
Denominator:
Weighted-average ordinary shares - basic	38,258,341		36,442,536		37,986,839	36,191,420
Weighted-average ordinary shares - diluted	38,258,341		36,442,536		37,986,839	36,191,420
Net loss per ordinary share:
Basic	$ (0.62)		$ (0.20)		$ (0.91)	$ (0.50)
Diluted	$ (0.62)		$ (0.20)		$ (0.91)	$ (0.50)

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 1
-Subparagraph (e)(4)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Subparagraph (b)
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1337-109256

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
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-Section 55
-Paragraph 52
-URI https://asc.fasb.org/extlink&oid=128363288&loc=d3e4984-109258

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
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-Subparagraph (SX 210.7-04(23))
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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-Publisher FASB
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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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- 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 Loss Per Ordinary Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of earnings per share	1,802,938	1,897,540	2,001,354	2,067,262
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	328,198	367,880	370,069	397,871
Restricted stock units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of earnings per share	1,463,284	1,528,946	1,620,052	1,657,599
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	11,456	714	11,233	11,792

Income Taxes - Summary of Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Income Tax Disclosure [Abstract]
Loss before income taxes	$ (20,214)	$ (5,742)	$ (30,626)	$ (15,285)
Provision for income taxes	$ 3,436	$ 1,414	$ 3,846	$ 2,689
Effective tax rate	(17.00%)	(24.60%)	(12.60%)	(17.60%)

- 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.

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Income Taxes [Line Items]
Income tax provision	$ 3,436	$ 1,414	$ 3,846	$ 2,689
Unrecognized tax benefits	$ 31,300		$ 31,300
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
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
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

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Commitments and Contingencies - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jul. 31, 2022	Jan. 31, 2022
Loss Contingencies [Line Items]
Total manufacturing purchase commitments	$ 68,300,000	$ 71,500,000
Loss recognized from adverse purchase commitments	1,900,000	0
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	3 Months Ended		6 Months Ended
	Jul. 31, 2022 USD ($)	Jul. 31, 2021	Jul. 31, 2022 USD ($) Segment	Jul. 31, 2021	Jan. 31, 2022 USD ($)
Concentration Risk [Line Items]
Number of reportable segment \| Segment			1
Property and equipment, net	$ 10,443		$ 10,443		$ 10,134
Accounts receivable	$ 37,698		$ 37,698		$ 44,307
Sales revenue, net [Member] \| WT [Member] \| Customer concentration risk [Member]
Concentration Risk [Line Items]
Percentage of revenue	59.40%	61.60%	57.90%	62.40%
Sales revenue, net [Member] \| Chicony [Member] \| Customer concentration risk [Member]
Concentration Risk [Line Items]
Percentage of revenue	12.90%	15.80%	12.10%	15.80%
Accounts receivable [Member] \| WT [Member] \| Credit concentration risk [Member]
Concentration Risk [Line Items]
Accounts receivable	$ 16,200		$ 16,200
Accounts receivable [Member] \| Chicony [Member] \| Credit concentration risk [Member]
Concentration Risk [Line Items]
Accounts receivable	10,500		10,500
United States [Member]
Concentration Risk [Line Items]
Property and equipment, net	5,300		5,300
Asia Pacific [Member]
Concentration Risk [Line Items]
Property and equipment, net	3,600		3,600
Europe [Member]
Concentration Risk [Line Items]
Property and equipment, net	$ 1,600		$ 1,600

Segment Reporting - Company's Revenue by Geographic Region Based on Bill-to Location (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Revenue from External Customer [Line Items]
Total revenue	$ 80,884	$ 79,327	$ 171,189	$ 149,460
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	49,805	49,136	103,441	93,723
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	17,844	20,162	39,399	38,799
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	4,479	4,387	12,872	7,405
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	4,386	4,443	9,272	7,133
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 4,370	$ 1,199	$ 6,205	$ 2,400

- 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.

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