Ambarella (AMBA) 10-Q 10 Dec 21 2022 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Oct. 31, 2021	Dec. 02, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2021
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
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		37,003,100
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

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021
Current assets:
Cash and cash equivalents	$ 457,760	$ 241,274
Marketable debt securities	0	199,434
Accounts receivable, net	44,776	24,974
Inventories	47,039	26,081
Restricted cash	10	10
Prepaid expenses and other current assets	5,789	5,531
Total current assets	555,374	497,304
Property and equipment, net	8,498	5,530
Deferred tax assets, non-current	11,467	10,914
Intangible assets, net	15,267	18,703
Operating lease right-of-use assets, net	11,958	9,659
Goodwill	26,601	26,601
Other non-current assets	4,190	4,569
Total assets	633,355	573,280
Current liabilities:
Accounts payable	27,071	21,124
Accrued and other current liabilities	48,909	48,126
Operating lease liabilities, current	3,494	2,911
Income taxes payable	1,358	962
Deferred revenue, current	787	844
Total current liabilities	81,619	73,967
Operating lease liabilities, non-current	9,053	7,525
Other long-term liabilities	13,448	16,812
Total liabilities	104,120	98,304
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 October 31, 2021 and January 31, 2021, respectively	0	0
Ordinary shares, $0.00045 par value per share, 200,000,000 shares authorized at October 31, 2021 and January 31, 2021, respectively; 36,925,142 shares issued and outstanding at October 31, 2021; 35,547,440 shares issued and outstanding at January 31, 2021	17	16
Additional paid-in capital	420,153	347,458
Accumulated other comprehensive income	0	1,219
Retained earnings	109,065	126,283
Total shareholders’ equity	529,235	474,976
Total liabilities and shareholders' equity	$ 633,355	$ 573,280

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Oct. 31, 2021	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	36,925,142	35,547,440
Ordinary shares, shares outstanding	36,925,142	35,547,440

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Income Statement [Abstract]
Revenue	$ 92,167	$ 56,090	$ 241,627	$ 160,848
Cost of revenue	34,541	21,298	90,817	63,078
Gross profit	57,626	34,792	150,810	97,770
Operating expenses:
Research and development	41,362	36,573	118,794	103,575
Selling, general and administrative	17,475	14,468	49,323	41,348
Total operating expenses	58,837	51,041	168,117	144,923
Loss from operations	(1,211)	(16,249)	(17,307)	(47,153)
Other income, net	407	673	1,218	3,231
Loss before income taxes	(804)	(15,576)	(16,089)	(43,922)
Provision (benefit) for income taxes	(1,560)	1,502	1,129	3,375
Net income (loss)	$ 756	$ (17,078)	$ (17,218)	$ (47,297)
Net income (loss) per share attributable to ordinary shareholders:
Basic	$ 0.02	$ (0.49)	$ (0.47)	$ (1.37)
Diluted	$ 0.02	$ (0.49)	$ (0.47)	$ (1.37)
Weighted-average shares used to compute net income (loss) per share attributable to ordinary shareholders:
Basic	36,792,187	34,819,880	36,391,676	34,460,172
Diluted	39,046,274	34,819,880	36,391,676	34,460,172

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 756	$ (17,078)	$ (17,218)	$ (47,297)
Other comprehensive income (loss), net of tax:
Net change and reclassification of unrealized gains (losses) on investments	(608)	(224)	(1,219)	595
Other comprehensive income (loss), net of tax	(608)	(224)	(1,219)	595
Comprehensive income (loss)	$ 148	$ (17,302)	$ (18,437)	$ (46,702)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Outstanding Ordinary Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]
Beginning Balance, Amount at Jan. 31, 2020	$ 448,072	$ 15	$ 261,220	$ 768	$ 186,069
Beginning Balance, Shares at Jan. 31, 2020		33,805,609
Issuance of shares through employee equity incentive plan, Amount	6,463	$ 0	6,463	0	0
Issuance of shares through employee equity incentive plan, Shares		478,643
Issuance of shares through employee stock purchase plan, Amount	2,660	$ 0	2,660	0	0
Issuance of shares through employee stock purchase plan, Shares		83,564
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	15,214	$ 0	15,214	0	0
Other comprehensive income (loss) - net of tax	(363)	0	0	(363)	0
Net income (loss)	(15,463)	0	0	0	(15,463)
Ending Balance, Amount at Apr. 30, 2020	455,583	$ 15	284,557	405	170,606
Ending Balance, Shares at Apr. 30, 2020		34,342,097
Beginning Balance, Amount at Jan. 31, 2020	448,072	$ 15	261,220	768	186,069
Beginning Balance, Shares at Jan. 31, 2020		33,805,609
Other comprehensive income (loss) - net of tax	595
Net income (loss)	(47,297)
Ending Balance, Amount at Oct. 31, 2020	462,653	$ 16	322,502	1,363	138,772
Ending Balance, Shares at Oct. 31, 2020		35,072,089
Beginning Balance, Amount at Apr. 30, 2020	455,583	$ 15	284,557	405	170,606
Beginning Balance, Shares at Apr. 30, 2020		34,342,097
Issuance of shares through employee equity incentive plan, Amount	344	$ 0	344	0	0
Issuance of shares through employee equity incentive plan, Shares		268,739
Stock-based compensation expense related to stock awards granted to employees and consultants	16,294	$ 0	16,294	0	0
Other comprehensive income (loss) - net of tax	1,182	0	0	1,182	0
Net income (loss)	(14,756)	0	0	0	(14,756)
Ending Balance, Amount at Jul. 31, 2020	458,647	$ 15	301,195	1,587	155,850
Ending Balance, Shares at Jul. 31, 2020		34,610,836
Issuance of shares through employee equity incentive plan, Amount	1,103	$ 1	1,102	0	0
Issuance of shares through employee equity incentive plan, Shares		361,886
Issuance of shares through employee stock purchase plan, Amount	3,164	$ 0	3,164	0	0
Issuance of shares through employee stock purchase plan, Shares		99,367
Stock-based compensation expense related to stock awards granted to employees and consultants	17,041	$ 0	17,041	0	0
Other comprehensive income (loss) - net of tax	(224)	0	0	(224)	0
Net income (loss)	(17,078)	0	0	0	(17,078)
Ending Balance, Amount at Oct. 31, 2020	462,653	$ 16	322,502	1,363	138,772
Ending Balance, Shares at Oct. 31, 2020		35,072,089
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	35,547,440
Issuance of shares through employee equity incentive plan, Amount	$ 6,741	$ 0	6,741	0	0
Issuance of shares through employee equity incentive plan, 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 related to stock awards granted to employees and consultants	17,128	$ 0	17,128	0	0
Other comprehensive income (loss) - net of tax	(427)	0	0	(427)	0
Net income (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	35,547,440
Other comprehensive income (loss) - net of tax	$ (1,219)
Net income (loss)	(17,218)
Ending Balance, Amount at Oct. 31, 2021	$ 529,235	$ 17	420,153		109,065
Ending Balance, Shares at Oct. 31, 2021	36,925,142	36,925,142
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 incentive plan, Amount	1,461	$ 0	1,461	0	0
Issuance of shares through employee equity incentive plan, Shares		371,293
Stock-based compensation expense related to stock awards granted to employees and consultants	17,639	$ 0	17,639	0	0
Other comprehensive income (loss) - net of tax	(184)	0	0	(184)	0
Net income (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
Issuance of shares through employee equity incentive plan, Amount	2,201	$ 1	2,200	0	0
Issuance of shares through employee equity incentive plan, Shares		244,507
Issuance of shares through employee stock purchase plan, Amount	3,513	$ 0	3,513	0	0
Issuance of shares through employee stock purchase plan, Shares		35,999
Stock-based compensation expense related to stock awards granted to employees and consultants	20,319	$ 0	20,319	0	0
Other comprehensive income (loss) - net of tax	(608)	0	0	(608)	0
Net income (loss)	756	0	0	$ 0	756
Ending Balance, Amount at Oct. 31, 2021	$ 529,235	$ 17	$ 420,153		$ 109,065
Ending Balance, Shares at Oct. 31, 2021	36,925,142	36,925,142

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Cash flows from operating activities:
Net loss	$ (17,218)	$ (47,297)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	9,139	8,868
Amortization (accretion) of premium (discount) on marketable debt securities, net	1,034	348
Stock-based compensation	60,267	51,407
Deferred income taxes	(553)	(63)
Other non-cash items, net	(517)	(94)
Changes in operating assets and liabilities:
Accounts receivable	(19,802)	(5,624)
Inventories	(20,958)	(741)
Prepaid expenses and other current assets	(275)	238
Other non-current assets	878	683
Accounts payable	5,947	(297)
Accrued and other current liabilities	2,359	9,887
Income taxes payable	396	1,020
Deferred revenue	(57)	477
Operating lease liabilities	(2,681)	(1,656)
Other long-term liabilities	265	1,160
Net cash provided by operating activities	18,224	18,316
Cash flows from investing activities:
Purchase of investments	(118,726)	(175,265)
Sales of investments	208,132	57,936
Maturities of investments	107,760	92,897
Purchase of tangible and intangible assets	(6,235)	(1,529)
Net cash provided by (used in) investing activities	190,931	(25,961)
Cash flows from financing activities:
Stock repurchase	0	(1,000)
Proceeds from exercise of stock options and employee stock purchase plan	11,127	6,504
Payment for intangible assets	(3,796)	(3,753)
Net cash provided by financing activities	7,331	1,751
Net increase (decrease) in cash, cash equivalents and restricted cash	216,486	(5,894)
Cash, cash equivalents and restricted cash at beginning of period	241,284	231,412
Cash, cash equivalents and restricted cash at end of period	457,770	225,518
Supplemental disclosure of cash flow information:
Cash paid for income taxes	1,294	937
Supplemental disclosure of noncash investing and financing activities:
Unpaid liabilities related to tangible and intangible assets additions	$ 1,346	$ 3,656

Organization and Summary of Sig

Organization and Summary of Significant Accounting Policies	9 Months Ended
	Oct. 31, 2021
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 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 2021 fiscal year filed with the SEC on March 31, 2021 (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. Use of Estimates The preparation of condensed 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) write down of excess and obsolete inventories; (ii) the estimated useful lives of long-lived assets; (iii) the valuation of stock-based compensation awards and financial instruments; (iv) the probability of performance objectives achievement; and (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 financial instruments, 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. The Company also assessed the impacts of COVID-19 on the above accounting matters as of October 3 1 , 2021 and through the date of issuing this report. While it is difficult to quantify the impact of COVID-19 , the future magnitude and duration of COVID-19, as well as other associated factors, could r esult in material negative impacts to the Company’s condensed consolidated financial statements in future reporting periods . 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 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, 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. Financial Instruments 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 recognizes credit losses based on a forward-looking current expected credit losses (CECL) model, including accounts receivable. The Company’s accounts receivable are recorded at invoiced amount less an allowance for any potentially uncollectible amounts. Accordingly, the Company makes estimates of expected credit losses for the allowance for doubtful accounts based upon its assessment of various factors, including historical collection experience, the age of the 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 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 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 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 income in the condensed consolidated balance sheets. As of October 31, 2021, the Company fully liquidated all of the investments in debt securities and realized all of the gains and losses in the condensed consolidated statements of operations. Restricted Cash Amounts included in restricted cash represent those required to be set aside to secure certain transactions in a foreign entity. The following table presents cash, cash equivalents and restricted cash reported on the condensed consolidated balance sheets, and the sums are presented on the condensed consolidated statements of cash flows: As of October 31, 2021 January 31, 2021 October 31, 2020 January 31, 2020 (in thousands) Cash and cash equivalents $ 457,760 $ 241,274 $ 225,508 $ 231,403 Restricted cash 10 10 10 9 Total as presented in the condensed consolidated statements of cash flows $ 457,770 $ 241,284 $ 225,518 $ 231,412 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. Software Licenses 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 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, t . 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 three and nine months ended October 31, 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 October 31, 2021 and January 31, 2021, the contract assets for these unbilled receivables were not material. 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. 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. For the three and nine months ended October 31, 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 October 31, 2021 and January 31, 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 October 31, 2021 and January 31, 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 cost of materials, cost associated with packaging and assembly, testing and shipping, cost of personnel, stock-based compensation, logistics and quality assurance, warranty cost, royalty expense, write-downs of inventories and allocation of overhead. 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 October 31, 2021, there was approximately $1.4 million of grants recorded in prepaid expenses and other current assets and approximately $0.9 million of grants recorded in other non-current assets in the condensed consolidated balance sheets. 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 condensed 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 condensed consolidated balance sheets. In general, deferred tax assets represent future tax benefits to be received when certain expenses previously recognized in the condensed 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 condensed 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 and unvested 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, net from available-for-sale securities that are excluded from net income (loss). Recent Accounting Pronouncements None.

Financial Instruments and Fair

Financial Instruments and Fair Value	9 Months Ended
	Oct. 31, 2021
Investments All Other Investments [Abstract]
Financial Instruments and Fair Value	2. 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 condensed consolidated balance sheets. As of October 31, 2021, the Company fully liquidated all of the investments and reported the remaining cash equivalents in the condensed consolidated balance sheets as follows: As of October 31, 2021 Amortized Unrealized 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 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 October 31, 2021 January (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 October 31, 2021 and January 31, 2021 were as follows: As of October 31, 2021 January (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 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 income in the condensed consolidated balance sheets. The credit-related losses were not material for the three and nine months ended October 31, 2020, respectively. As of October 31, 2021, the Company fully liquidated all of the investment in debt securities and realized all of the gains and losses in the condensed consolidated statement 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 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 October 31, 2021 and January 31, 2021, respectively: As of October 31, 2021 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

Inventories	9 Months Ended
	Oct. 31, 2021
Inventory Disclosure [Abstract]
Inventories	3. Inventories Inventories at October 31, 2021 and January 31, 2021 consisted of the following: As of October 31, 2021 January (in thousands) Work-in-progress $ 30,240 $ 18,219 Finished goods 16,799 7,862 Total $ 47,039 $ 26,081

Property and Equipment, Net

Property and Equipment, Net	9 Months Ended
	Oct. 31, 2021
Property Plant And Equipment [Abstract]
Property and Equipment, Net	4. Property and Equipment, Net Depreciation expense was approximately $0.7 million and $0.6 million for the three months ended October 31, 2021 and 2020, respectively, and was approximately $1.9 million and $1.9 million for the nine months ended October 31, 2021 and 2020, respectively. Property and equipment at October 31, 2021 and January 31, 2021 consisted of the following: As of October 31, 2021 January (in thousands) Computer equipment and software $ 14,316 $ 11,525 Machinery and equipment 7,368 6,946 Furniture and fixtures 1,158 969 Leasehold improvements 2,621 2,237 Construction in progress 1,419 331 26,882 22,008 Less: accumulated depreciation and amortization (18,384 ) (16,478 ) Total property and equipment, net $ 8,498 $ 5,530

Intangible Assets, Net

Intangible Assets, Net	9 Months Ended
	Oct. 31, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets, Net	5. Intangible Assets, Net The intangible assets primarily consist of $4.0 million of developed technology and $11.3 million of software licenses, net of amortization expense. In the third quarter of fiscal year 2022, the Company determined that the underlying project incorporating the in-process research and development (“IPR&D”) from the acquisition of VisLab S.r.l., or VisLab, 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 October 31, 2021, $5.7 million was recorded in accrued and other current liabilities and $2.6 million was recorded in other long-term liabilities in the condensed consolidated balance sheets. The carrying amounts of intangible assets as of October 31, 2021 and January 31, 2021 were as follows As of October 31, 2021 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 4,100 (147 ) 3,953 — — — Software licenses 21,708 (10,394 ) 11,314 21,043 (6,440 ) 14,603 Total intangible assets, net $ 25,808 $ (10,541 ) $ 15,267 $ 25,143 $ (6,440 ) $ 18,703 The amortization expense related to the intangible assets was approximately $1.7 million and $1.7 million for the three months ended October 31, 2021 and 2020, respectively, and was approximately $4.7 million and $4.8 million for the nine months ended October 31, 2021 and 2020, respectively. The expected future amortization expense related to these intangible assets as of October 31, 2021 is as follows: As of October 31, 2021 Fiscal Year (in thousands) 2022 (3 months remaining) $ 1,665 2023 7,292 2024 3,478 2025 782 2026 586 Thereafter 1,464 Total future amortization expenses: $ 15,267 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 three and nine months ended October 31, 2021 and 2020, respectively.

Accrued and Other Current Liabi

Accrued and Other Current Liabilities	9 Months Ended
	Oct. 31, 2021
Payables And Accruals [Abstract]
Accrued and Other Current Liabilities	6. Accrued and Other Current Liabilities Accrued and other current liabilities at October 31, 2021 and January 31, 2021 consisted of the following: As of October 31, 2021 January (in thousands) Accrued employee compensation $ 20,459 $ 18,105 Accrued rebates 253 391 Accrued product development costs 16,305 21,157 Software license liabilities, current 5,677 5,582 Other accrued liabilities 6,215 2,891 Total accrued and other current liabilities $ 48,909 $ 48,126

Leases

Leases	9 Months Ended
	Oct. 31, 2021
Leases [Abstract]
Leases	7. Leases The Company has entered into various operating leases for its worldwide office facilities. During the nine months ended October 31, 2021, 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 condensed consolidated balance sheets as a result of these lease extensions and additional leased space. The operating lease expense was approximately $0.9 million and $0.8 million for the three months ended October 31, 2021 and 2020, respectively. The operating lease expense was approximately $2.5 million and $2.2 million for the nine months ended October 31, 2021 and 2020, respectively. The Company's short-term leases and finance leases were not material as of October 31, 2021 and January 31, 2021, respectively . Supplemental cash flow information related to leases is as follows: Three Months Ended Nine Months Ended October 31, 2021 October 31, 2021 (in thousands) Cash paid for operating leases included in operating cash flows $ 918 $ 2,681 Supplemental non-cash information related to lease liabilities arising from obtaining right-of-use assets $ 95 $ 272 Leased assets obtained in exchange for operating lease liabilities arising from lease modifications $ 1,112 $ 2,799 As of October 31, 2021, the weighted average remaining lease term is 3.81 years, and the weighted average discount rate is 3.55 percent. Future minimum lease payments for the lease liabilities are as follows : As of October 31, 2021 Fiscal Year (in thousands) 2022 (3 months remaining) $ 951 2023 3,698 2024 3,474 2025 3,267 2026 1,431 Thereafter 485 Total future annual minimum lease payments 13,306 Less: interest (759 ) Total lease liabilities $ 12,547

Other Long-Term Liabilities

Other Long-Term Liabilities	9 Months Ended
	Oct. 31, 2021
Other Liabilities Disclosure [Abstract]
Other Long-Term Liabilities	8. Other Long-Term Liabilities Other long-term liabilities at October 31, 2021 and January 31, 2021 consisted of the following: As of October 31, 2021 January (in thousands) Unrecognized tax benefits, including interest $ 9,224 $ 8,966 Deferred tax liabilities, non-current 1,287 1,288 Software license liabilities, non-current 2,630 6,259 Other long-term liabilities 307 299 Total other long-term liabilities $ 13,448 $ 16,812

Capital Stock

Capital Stock	9 Months Ended
	Oct. 31, 2021
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 October 31, 2021 and January 31, 2021, respectively. Ordinary shares As of October 31, 2021 and January 31, 2021, a total of 200,000,000 ordinary shares were authorized. In June 2021, the Company’s shareholders approved the 2021 Equity Incentive Plan, or 2021 EIP. The 2021 EIP permits the grant of incentive stock options, or 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 nonstatutory stock options, or 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 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, the Company added 1,599,634 ordinary shares 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. In the first quarter of fiscal year 2022, the Company added 444,343 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 such date, or (iii) an amount determined by the Company’s Board of Directors or a duly authorized committee of the Board of Directors. As of October 31, 2021 and January 31, 2021, the following ordinary shares were reserved for future issuance under the EIP and ESPP: As of October 31, 2021 January 31, 2021 Shares reserved for options, restricted stock and restricted stock units under EIP 7,671,344 5,981,741 Shares reserved for ESPP 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 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.There were no ordinary shares repurchased in the nine months ended October 31, 2021. 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 October 31, 2021, there was approximately $49.0 million available for repurchases under the repurchase program through June 30, 2022.

Stock-based Compensation

Stock-based Compensation	9 Months Ended
	Oct. 31, 2021
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 October 31, Nine Months Ended October 31, 2021 2020 2021 2020 (in thousands) Stock-based compensation: Cost of revenue $ 391 $ 368 $ 1,073 $ 981 Research and development 13,725 11,496 36,444 31,402 Selling, general and administrative 7,937 7,113 22,750 19,024 Total stock-based compensation $ 22,053 $ 18,977 $ 60,267 $ 51,407 During the three and nine months ended October 31, 2021, approximately $1.7 million and $5.1 million of stock-based compensation expense was accrued in accrued and other current liabilities in the condensed consolidated balance sheets, respectively. As of October 31, 2021, total unrecognized compensation cost related to unvested stock options was $2.4 million and is expected to be recognized over a weighted-average period of 2.13 years. Total unrecognized compensation cost related to unvested restricted stock units was $198.6 million and is expected to be recognized over a weighted-average period of 2.45 years. 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 October 31, Nine Months Ended October 31, 2021 2020 2021 2020 Stock Options: Volatility — 52 % 51 % 52 % Risk-free interest rate — 0.40 % 0.98 % 0.52 % Expected term (years) — 5.81 5.27 5.84 Dividend yield — 0 % 0 % 0 % Employee stock purchase plan awards: Volatility 54 % 58 % 57 % 59 % Risk-free interest rate 0.05 % 0.12 % 0.06 % 0.21 % Expected term (years) 0.5 0.5 0.5 0.5 Dividend yield 0 % 0 % 0 % 0 % The following table summarizes stock option activities for the period indicated: Option Outstanding Weighted- Total Average Weighted- Value Of Remaining Aggregate Weighted- Average Options Contractual Intrinsic Average Grant-date Exercised Term Value Shares Exercise Fair Value (in (in years) (in Outstanding at January 31, 2021 719,143 $ 38.33 Granted 14,700 110.19 $ 50.28 Exercised (229,051 ) 25.37 $ 19,201 Forfeited (7,401 ) 69.40 Expired (1,146 ) 9.86 Outstanding at October 31, 2021 496,245 46.05 4.64 $ 69,365 Exercisable at October 31, 2021 411,465 $ 42.64 3.90 $ 58,916 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 October 31, 2021 was $185.83, 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 units activities for the period indicated: Weighted- Average Grant-Date Shares Fair Value Unvested at January 31, 2021 2,871,801 $ 51.73 Granted 1,113,417 122.39 Vested (1,029,869 ) 50.81 Forfeited (48,983 ) 66.60 Unvested at October 31, 2021 2,906,366 $ 78.88 As of October 31, 2021, the aggregate intrinsic value of unvested restricted stock units was $540.1 million.

Net Income (Loss) Per Ordinary

Net Income (Loss) Per Ordinary Share	9 Months Ended
	Oct. 31, 2021
Earnings Per Share [Abstract]
Net Income (Loss) Per Ordinary Share	11. Net Income (Loss) Per Ordinary Share The following table sets forth the computation of basic and diluted net income (loss) per ordinary share for the periods indicated: Three Nine 2021 2020 2021 2020 (in thousands, except share and per share data) Numerator: Net income (loss) $ 756 $ (17,078 ) $ (17,218 ) $ (47,297 ) Denominator: Weighted-average ordinary shares - basic 36,792,187 34,819,880 36,391,676 34,460,172 Effect of potentially dilutive securities: Employee stock options 327,417 — — — Restricted stock units 1,921,723 — — — Employee stock purchase plan 4,947 — — — Weighted-average ordinary shares - diluted 39,046,274 34,819,880 36,391,676 34,460,172 Net income (loss) per ordinary share: Basic $ 0.02 $ (0.49 ) $ (0.47 ) $ (1.37 ) Diluted $ 0.02 $ (0.49 ) $ (0.47 ) $ (1.37 ) The following weighted-average potentially dilutive securities were excluded from the computation of diluted net income (loss) per ordinary share as their effect would have been antidilutive: Three Months Ended October 31, Nine Months Ended October 31, 2021 2020 2021 2020 Options to purchase ordinary shares 13,399 701,113 269,713 734,506 Restricted stock units 51 1,233,679 1,105,083 1,316,682 Employee stock purchase plan 3,446 23,144 9,010 26,494 16,896 1,957,936 1,383,806 2,077,682

Income Taxes

Income Taxes	9 Months Ended
	Oct. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes The following table provides details of income taxes for the periods indicated: Three Months Ended October 31, Nine Months Ended October 31, 2021 2020 2021 2020 (in thousands) Loss before income taxes $ (804 ) $ (15,576 ) $ (16,089 ) $ (43,922 ) Provision (benefit) for income taxes (1,560 ) 1,502 1,129 3,375 Effective tax rate 194.2% (9.6)% (7.0)% (7.7)% The Company recorded an income tax benefit of $1.6 million and an income tax provision of $1.5 million for the three months ended October 31, 2021 and 2020, respectively. The change from an income tax provision to an income tax benefit was primarily due to the changes in the amounts of pre-tax income, changes to the Company’s estimated annual effective tax rate, and an increase in tax benefits from excess stock-based compensation deductions. The Company recorded an income tax provision of $1.1 million and $3.4 million for the nine months ended October 31, 2021 and 2020, respectively. The decrease in income tax expense was primarily due to an increase in the U.S. federal research tax credit, and an increase in tax benefits from excess stock-based compensation deductions. 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 2020 remain open to examination by U.S. federal tax authorities. The tax years 2009 to 2020 remain open to examination by U.S. state tax authorities. The tax years 2015 to 2020 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 October 31, 2021, the gross amount of unrecognized tax benefits was approximately $28.1 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.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Oct. 31, 2021
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 October 31, 2021 and January 31, 2021, total manufacturing purchase commitments were approximately $66.0 million and $48.2 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 October 31, 2021, there was no material loss recognized in the condensed 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 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 October 31, 2021 and January 31, 2021, respectively.

Segment Reporting

Segment Reporting	9 Months Ended
	Oct. 31, 2021
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 October 31, Nine Months Ended October 31, 2021 2020 2021 2020 (in thousands) Taiwan $ 59,412 $ 35,073 $ 153,135 $ 96,846 Asia Pacific 21,323 14,642 60,122 43,635 Europe 4,432 1,970 11,837 6,856 North America other than United States 5,984 2,433 13,117 8,449 United States 1,016 1,972 3,416 5,062 Total revenue $ 92,167 $ 56,090 $ 241,627 $ 160,848 As of October 31, 2021, substantially all of the Company’s property and equipment, net, was located in the United States, Asia Pacific region and Europe with approximate net amounts of $3.1 million, $4.0 million and $1.5 million, respectively. Major Customers For the three and nine months ended October 31, 2021, the customers representing 10% or more of revenue and accounts receivable were Wintech and Chicony, which accounted for approximately 63.1% and 13.4% of total revenue for the three months ended October 31, 2021, respectively, and accounted for approximately 62.7% and 14.9% of total revenue for the nine months ended October 31, 2021, respectively. For the three and nine months ended October 31, 2020, the customers representing 10% or more of revenue and accounts receivable were Wintech and Chicony, which accounted for approximately 62.3% and 17.6% of total revenue for the three months ended October 31, 2020, respectively, and accounted for approximately 60.4% and 17.4% of total revenue for the nine months ended October 31, 2020, respectively. Accounts receivable with Wintech and Chicony were approximately $23.5 million and $12.4 million as of October 31, 2021, respectively.

Subsequent Events

Subsequent Events	9 Months Ended
	Oct. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	15. Subsequent Events On November 5, 2021, the Company completed the 100% voting rights acquisition of Oculii Corporation, a privately-held Ohio-based company that develops adaptive radar perception algorithms for automotive, including advanced driver assistance systems and autonomous vehicle driving systems, and other commercial applications, for an aggregate consideration of $307.5 million in cash, subject to customary adjustments for cash, indebtedness, transaction expenses and working capital. In addition, the Company assumed all 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 incurred acquisition related costs of $1.6 million were recorded in the operating expenses in the condensed consolidated statements of operations in the third quarter of fiscal 2022. Due to the limited time since the acquisition date, and the size and complexity of the transaction, the accounting for the business combination and the assumed unvested options are not yet complete. Accordingly, the Company is not able to provide the allocation of consideration paid to the assets acquired or liabilities assumed and the fair value of the assumed unvested options as of the filing of the condensed consolidated financial statements, but it is expected that the transaction will result in an increase to the Company’s net assets and goodwill.

Organization and Summary of S_2

Organization and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Oct. 31, 2021
Accounting Policies [Abstract]
Organization	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 Presentation	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 2021 fiscal year filed with the SEC on March 31, 2021 (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	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.
Use of Estimates	Use of Estimates The preparation of condensed 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) write down of excess and obsolete inventories; (ii) the estimated useful lives of long-lived assets; (iii) the valuation of stock-based compensation awards and financial instruments; (iv) the probability of performance objectives achievement; and (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 financial instruments, 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. The Company also assessed the impacts of COVID-19 on the above accounting matters as of October 3 1 , 2021 and through the date of issuing this report. While it is difficult to quantify the impact of COVID-19 , the future magnitude and duration of COVID-19, as well as other associated factors, could r esult in material negative impacts to the Company’s condensed consolidated financial statements in future reporting periods .
Concentration of Risk	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 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, 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.
Financial Instruments	Financial Instruments 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 recognizes credit losses based on a forward-looking current expected credit losses (CECL) model, including accounts receivable. The Company’s accounts receivable are recorded at invoiced amount less an allowance for any potentially uncollectible amounts. Accordingly, the Company makes estimates of expected credit losses for the allowance for doubtful accounts based upon its assessment of various factors, including historical collection experience, the age of the 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 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 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 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 income in the condensed consolidated balance sheets. As of October 31, 2021, the Company fully liquidated all of the investments in debt securities and realized all of the gains and losses in the condensed consolidated statements of operations.
Restricted Cash	Restricted Cash Amounts included in restricted cash represent those required to be set aside to secure certain transactions in a foreign entity. The following table presents cash, cash equivalents and restricted cash reported on the condensed consolidated balance sheets, and the sums are presented on the condensed consolidated statements of cash flows: As of October 31, 2021 January 31, 2021 October 31, 2020 January 31, 2020 (in thousands) Cash and cash equivalents $ 457,760 $ 241,274 $ 225,508 $ 231,403 Restricted cash 10 10 10 9 Total as presented in the condensed consolidated statements of cash flows $ 457,770 $ 241,284 $ 225,518 $ 231,412
Inventories	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.
Software Licenses	Software Licenses 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 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	Leases The Company adopted Accounting Standards Codification (“ASC”) Topic 842, Leases in fiscal year 2020 . As a result, t .
Revenue Recognition	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 three and nine months ended October 31, 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 October 31, 2021 and January 31, 2021, the contract assets for these unbilled receivables were not material. 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. 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. For the three and nine months ended October 31, 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 October 31, 2021 and January 31, 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 October 31, 2021 and January 31, 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 Cost of revenue includes cost of materials, cost associated with packaging and assembly, testing and shipping, cost of personnel, stock-based compensation, logistics and quality assurance, warranty cost, royalty expense, write-downs of inventories and allocation of overhead.
Research and Development	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 October 31, 2021, there was approximately $1.4 million of grants recorded in prepaid expenses and other current assets and approximately $0.9 million of grants recorded in other non-current assets in the condensed consolidated balance sheets.
Income Taxes	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 condensed 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 condensed consolidated balance sheets. In general, deferred tax assets represent future tax benefits to be received when certain expenses previously recognized in the condensed 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 condensed consolidated statements of operations for the periods in which the adjustment is determined to be required.
Net Income (Loss) Per Ordinary Share	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 and unvested 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) Comprehensive income (loss) includes unrealized gains or losses, net from available-for-sale securities that are excluded from net income (loss).
Recent Accounting Pronouncements	Recent Accounting Pronouncements None.

Organization and Summary of S_3

Organization and Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Oct. 31, 2021
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 sums are presented on the condensed consolidated statements of cash flows: As of October 31, 2021 January 31, 2021 October 31, 2020 January 31, 2020 (in thousands) Cash and cash equivalents $ 457,760 $ 241,274 $ 225,508 $ 231,403 Restricted cash 10 10 10 9 Total as presented in the condensed consolidated statements of cash flows $ 457,770 $ 241,284 $ 225,518 $ 231,412

Financial Instruments and Fai_2

Financial Instruments and Fair Value (Tables)	9 Months Ended
	Oct. 31, 2021
Investments All Other Investments [Abstract]
Schedule of Available-for-Sale Securities at Fair Value	As of October 31, 2021, the Company fully liquidated all of the investments and reported the remaining cash equivalents in the condensed consolidated balance sheets as follows: As of October 31, 2021 Amortized Unrealized 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 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 October 31, 2021 January (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 October 31, 2021 and January 31, 2021 were as follows: As of October 31, 2021 January (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	As of October 31, 2021 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)

Inventories (Tables)	9 Months Ended
	Oct. 31, 2021
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventories at October 31, 2021 and January 31, 2021 consisted of the following: As of October 31, 2021 January (in thousands) Work-in-progress $ 30,240 $ 18,219 Finished goods 16,799 7,862 Total $ 47,039 $ 26,081

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	9 Months Ended
	Oct. 31, 2021
Property Plant And Equipment [Abstract]
Schedule of Property and Equipment	Property and equipment at October 31, 2021 and January 31, 2021 consisted of the following: As of October 31, 2021 January (in thousands) Computer equipment and software $ 14,316 $ 11,525 Machinery and equipment 7,368 6,946 Furniture and fixtures 1,158 969 Leasehold improvements 2,621 2,237 Construction in progress 1,419 331 26,882 22,008 Less: accumulated depreciation and amortization (18,384 ) (16,478 ) Total property and equipment, net $ 8,498 $ 5,530

Intangible Assets, Net (Tables)

Intangible Assets, Net (Tables)	9 Months Ended
	Oct. 31, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Carrying Amounts of Intangible Assets	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 October 31, 2021, $5.7 million was recorded in accrued and other current liabilities and $2.6 million was recorded in other long-term liabilities in the condensed consolidated balance sheets. The carrying amounts of intangible assets as of October 31, 2021 and January 31, 2021 were as follows As of October 31, 2021 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 4,100 (147 ) 3,953 — — — Software licenses 21,708 (10,394 ) 11,314 21,043 (6,440 ) 14,603 Total intangible assets, net $ 25,808 $ (10,541 ) $ 15,267 $ 25,143 $ (6,440 ) $ 18,703
Summary of Expected Future Amortization Expense Related to Intangible Assets	The expected future amortization expense related to these intangible assets as of October 31, 2021 is as follows: As of October 31, 2021 Fiscal Year (in thousands) 2022 (3 months remaining) $ 1,665 2023 7,292 2024 3,478 2025 782 2026 586 Thereafter 1,464 Total future amortization expenses: $ 15,267

Accrued and Other Current Lia_2

Accrued and Other Current Liabilities (Tables)	9 Months Ended
	Oct. 31, 2021
Payables And Accruals [Abstract]
Schedule of Accrued and Other Current Liabilities	Accrued and other current liabilities at October 31, 2021 and January 31, 2021 consisted of the following: As of October 31, 2021 January (in thousands) Accrued employee compensation $ 20,459 $ 18,105 Accrued rebates 253 391 Accrued product development costs 16,305 21,157 Software license liabilities, current 5,677 5,582 Other accrued liabilities 6,215 2,891 Total accrued and other current liabilities $ 48,909 $ 48,126

Leases (Tables)

Leases (Tables)	9 Months Ended
	Oct. 31, 2021
Leases [Abstract]
Schedule of Supplemental Cash Flow Information Related to Leases	Supplemental cash flow information related to leases is as follows: Three Months Ended Nine Months Ended October 31, 2021 October 31, 2021 (in thousands) Cash paid for operating leases included in operating cash flows $ 918 $ 2,681 Supplemental non-cash information related to lease liabilities arising from obtaining right-of-use assets $ 95 $ 272 Leased assets obtained in exchange for operating lease liabilities arising from lease modifications $ 1,112 $ 2,799
Schedule of Future Minimum Lease Payments for Lease Liabilities	As of October 31, 2021, the weighted average remaining lease term is 3.81 years, and the weighted average discount rate is 3.55 percent. Future minimum lease payments for the lease liabilities are as follows : As of October 31, 2021 Fiscal Year (in thousands) 2022 (3 months remaining) $ 951 2023 3,698 2024 3,474 2025 3,267 2026 1,431 Thereafter 485 Total future annual minimum lease payments 13,306 Less: interest (759 ) Total lease liabilities $ 12,547

Other Long-Term Liabilities (Ta

Other Long-Term Liabilities (Tables)	9 Months Ended
	Oct. 31, 2021
Other Liabilities Disclosure [Abstract]
Schedule of Other Long-Term Liabilities	Other long-term liabilities at October 31, 2021 and January 31, 2021 consisted of the following: As of October 31, 2021 January (in thousands) Unrecognized tax benefits, including interest $ 9,224 $ 8,966 Deferred tax liabilities, non-current 1,287 1,288 Software license liabilities, non-current 2,630 6,259 Other long-term liabilities 307 299 Total other long-term liabilities $ 13,448 $ 16,812

Capital Stock (Tables)

Capital Stock (Tables)	9 Months Ended
	Oct. 31, 2021
Equity [Abstract]
Schedule of Ordinary Shares Reserved for Future Issuance under EIP and ESPP	As of October 31, 2021 and January 31, 2021, the following ordinary shares were reserved for future issuance under the EIP and ESPP: As of October 31, 2021 January 31, 2021 Shares reserved for options, restricted stock and restricted stock units under EIP 7,671,344 5,981,741 Shares reserved for ESPP 2,624,704 2,299,143

Stock-based Compensation (Table

Stock-based Compensation (Tables)	9 Months Ended
	Oct. 31, 2021
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 October 31, Nine Months Ended October 31, 2021 2020 2021 2020 (in thousands) Stock-based compensation: Cost of revenue $ 391 $ 368 $ 1,073 $ 981 Research and development 13,725 11,496 36,444 31,402 Selling, general and administrative 7,937 7,113 22,750 19,024 Total stock-based compensation $ 22,053 $ 18,977 $ 60,267 $ 51,407
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 October 31, Nine Months Ended October 31, 2021 2020 2021 2020 Stock Options: Volatility — 52 % 51 % 52 % Risk-free interest rate — 0.40 % 0.98 % 0.52 % Expected term (years) — 5.81 5.27 5.84 Dividend yield — 0 % 0 % 0 % Employee stock purchase plan awards: Volatility 54 % 58 % 57 % 59 % Risk-free interest rate 0.05 % 0.12 % 0.06 % 0.21 % Expected term (years) 0.5 0.5 0.5 0.5 Dividend yield 0 % 0 % 0 % 0 %
Stock Option Activities	The following table summarizes stock option activities for the period indicated: Option Outstanding Weighted- Total Average Weighted- Value Of Remaining Aggregate Weighted- Average Options Contractual Intrinsic Average Grant-date Exercised Term Value Shares Exercise Fair Value (in (in years) (in Outstanding at January 31, 2021 719,143 $ 38.33 Granted 14,700 110.19 $ 50.28 Exercised (229,051 ) 25.37 $ 19,201 Forfeited (7,401 ) 69.40 Expired (1,146 ) 9.86 Outstanding at October 31, 2021 496,245 46.05 4.64 $ 69,365 Exercisable at October 31, 2021 411,465 $ 42.64 3.90 $ 58,916
Restricted Stock Units Activities	The following table summarizes restricted stock units activities for the period indicated: Weighted- Average Grant-Date Shares Fair Value Unvested at January 31, 2021 2,871,801 $ 51.73 Granted 1,113,417 122.39 Vested (1,029,869 ) 50.81 Forfeited (48,983 ) 66.60 Unvested at October 31, 2021 2,906,366 $ 78.88

Net Income (Loss) Per Ordinar_2

Net Income (Loss) Per Ordinary Share (Tables)	9 Months Ended
	Oct. 31, 2021
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Income (Loss) Per Ordinary Share	The following table sets forth the computation of basic and diluted net income (loss) per ordinary share for the periods indicated: Three Nine 2021 2020 2021 2020 (in thousands, except share and per share data) Numerator: Net income (loss) $ 756 $ (17,078 ) $ (17,218 ) $ (47,297 ) Denominator: Weighted-average ordinary shares - basic 36,792,187 34,819,880 36,391,676 34,460,172 Effect of potentially dilutive securities: Employee stock options 327,417 — — — Restricted stock units 1,921,723 — — — Employee stock purchase plan 4,947 — — — Weighted-average ordinary shares - diluted 39,046,274 34,819,880 36,391,676 34,460,172 Net income (loss) per ordinary share: Basic $ 0.02 $ (0.49 ) $ (0.47 ) $ (1.37 ) Diluted $ 0.02 $ (0.49 ) $ (0.47 ) $ (1.37 )
Weighted-Average Potentially Dilutive Securities Excluded from Computation of Diluted Net Income (Loss) Per Ordinary Share	The following weighted-average potentially dilutive securities were excluded from the computation of diluted net income (loss) per ordinary share as their effect would have been antidilutive: Three Months Ended October 31, Nine Months Ended October 31, 2021 2020 2021 2020 Options to purchase ordinary shares 13,399 701,113 269,713 734,506 Restricted stock units 51 1,233,679 1,105,083 1,316,682 Employee stock purchase plan 3,446 23,144 9,010 26,494 16,896 1,957,936 1,383,806 2,077,682

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Oct. 31, 2021
Income Tax Disclosure [Abstract]
Summary of Income Taxes	The following table provides details of income taxes for the periods indicated: Three Months Ended October 31, Nine Months Ended October 31, 2021 2020 2021 2020 (in thousands) Loss before income taxes $ (804 ) $ (15,576 ) $ (16,089 ) $ (43,922 ) Provision (benefit) for income taxes (1,560 ) 1,502 1,129 3,375 Effective tax rate 194.2% (9.6)% (7.0)% (7.7)%

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Oct. 31, 2021
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 October 31, Nine Months Ended October 31, 2021 2020 2021 2020 (in thousands) Taiwan $ 59,412 $ 35,073 $ 153,135 $ 96,846 Asia Pacific 21,323 14,642 60,122 43,635 Europe 4,432 1,970 11,837 6,856 North America other than United States 5,984 2,433 13,117 8,449 United States 1,016 1,972 3,416 5,062 Total revenue $ 92,167 $ 56,090 $ 241,627 $ 160,848

Organization and Summary of S_4

Organization and Summary of Significant Accounting Policies - Schedule of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021	Oct. 31, 2020	Jan. 31, 2020
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 457,760	$ 241,274	$ 225,508	$ 231,403
Restricted cash	10	10	10	9
Total as presented in the condensed consolidated statements of cash flows	$ 457,770	$ 241,284	$ 225,518	$ 231,412

Organization and Summary of S_5

Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Material inventory losses recognized	$ 0	$ 0	$ 0	$ 0
Prepaid Expenses and Other Current Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Grants recorded	1,400,000		1,400,000
Other Non-current Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Grants recorded	$ 900,000		$ 900,000

Financial Instruments and Fai_3

Financial Instruments and Fair Value - Schedule of Available-for-Sale Securities at Fair Value (Detail) - USD ($) $ in Thousands	Oct. 31, 2021	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 Fai_4

Financial Instruments And Fair Value - Schedule of Cash Equivalents and Marketable Debt Securities (Detail) - USD ($) $ in Thousands	Oct. 31, 2021	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 Fai_5

Financial Instruments and Fair Value - Summary of Contractual Maturities of Investments (Detail) - USD ($) $ in Thousands	Oct. 31, 2021	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

Financial Instruments and Fai_6

Financial Instruments and Fair Value - Schedule of Fair Value of Financial Instruments Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Oct. 31, 2021	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

Inventories - Schedule of Inven

Inventories - Schedule of Inventory (Detail) - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021
Inventory Disclosure [Abstract]
Work-in-progress	$ 30,240	$ 18,219
Finished goods	16,799	7,862
Total	$ 47,039	$ 26,081

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Property Plant And Equipment [Abstract]
Depreciation of property and equipment	$ 0.7	$ 0.6	$ 1.9	$ 1.9

Property and Equipment, Net - S

Property and Equipment, Net - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 26,882	$ 22,008
Less: accumulated depreciation and amortization	(18,384)	(16,478)
Total property and equipment, net	8,498	5,530
Computer equipment and software [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	14,316	11,525
Machinery and equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	7,368	6,946
Furniture and fixtures [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,158	969
Leasehold improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,621	2,237
Construction in progress [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 1,419	$ 331

Intangible Assets, Net - Additi

Intangible Assets, Net - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020	Jan. 31, 2021
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense	$ 15,267,000		$ 15,267,000		$ 18,703,000
Liabilities associated with noncancelable internal-use software license at net present value, current	5,677,000		5,677,000		5,582,000
Liabilities associated with noncancelable internal-use software license at net present value, non-current	2,630,000		2,630,000		6,259,000
Amortization expense	1,700,000	$ 1,700,000	4,700,000	$ 4,800,000
Impairment of intangible assets	0	$ 0	0	$ 0
Developed technology [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense	3,953,000		3,953,000		0
Internal-use software licenses [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense	11,314,000		11,314,000		14,603,000
IPR&D [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of amortization expense	$ 0		0		$ 4,100,000
Intangible assets acquired			$ 4,100,000
Estimated economic life			7 years

Intangible Assets, Net - Summar

Intangible Assets, Net - Summary of Carrying Amounts of Intangible Assets (Detail) - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 25,808	$ 25,143
Accumulated Amortization	(10,541)	(6,440)
Net Carrying Amount	15,267	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	4,100	0
Accumulated Amortization	(147)	0
Net Carrying Amount	3,953	0
Software licenses [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	21,708	21,043
Accumulated Amortization	(10,394)	(6,440)
Net Carrying Amount	$ 11,314	$ 14,603

Intangible Assets, Net - Summ_2

Intangible Assets, Net - Summary of Expected Future Amortization Expense Related to Intangible Assets (Detail) - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
2022 (3 months remaining)	$ 1,665
2023	7,292
2024	3,478
2025	782
2026	586
Thereafter	1,464
Net Carrying Amount	$ 15,267	$ 18,703

Accrued and Other Current Lia_3

Accrued and Other Current Liabilities - Schedule of Accrued and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021
Payables And Accruals [Abstract]
Accrued employee compensation	$ 20,459	$ 18,105
Accrued rebates	253	391
Accrued product development costs	16,305	21,157
Software license liabilities, current	5,677	5,582
Other accrued liabilities	6,215	2,891
Total accrued and other current liabilities	$ 48,909	$ 48,126

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Lessee Lease Description [Line Items]
Operating lease expense	$ 0.9	$ 0.8	$ 2.5	$ 2.2
Weighted-average remaining lease term - operating leases	3 years 9 months 21 days		3 years 9 months 21 days
Weighted-average discount rate - operating leases	3.55%		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. 1, 2021
Expiration date			Nov. 30, 2024
Lease term	3 years		3 years
Shanghai [Member] | Additional Office Space [Member]
Lessee Lease Description [Line Items]
Expiration date			Nov. 30, 2024
Lease term	40 months		40 months
Commencement date			Aug. 1, 2021
Hong Kong [Member] | Extended Office Lease [Member]
Lessee Lease Description [Line Items]
Inception date			Dec. 1, 2021
Expiration date			Nov. 30, 2026
Lease term	5 years		5 years

Leases - Schedule of Supplement

Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 31, 2021	Oct. 31, 2021
Leases [Abstract]
Cash paid for operating leases included in operating cash flows	$ 918	$ 2,681
Supplemental non-cash information related to lease liabilities arising from obtaining right-of-use assets	95	272
Leased assets obtained in exchange for operating lease liabilities arising from lease modifications	$ 1,112	$ 2,799

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Lease Payments for Lease Liabilities (Detail) $ in Thousands	Oct. 31, 2021USD ($)
Leases [Abstract]
2022 (3 months remaining)	$ 951
2023	3,698
2024	3,474
2025	3,267
2026	1,431
Thereafter	485
Total future annual minimum lease payments	13,306
Less: interest	(759)
Total lease liabilities	$ 12,547

Other Long-Term Liabilities - S

Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Detail) - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021
Other Liabilities Disclosure [Abstract]
Unrecognized tax benefits, including interest	$ 9,224	$ 8,966
Deferred tax liabilities, non-current	1,287	1,288
Software license liabilities, non-current	2,630	6,259
Other long-term liabilities	307	299
Total other long-term liabilities	$ 13,448	$ 16,812

Capital Stock - Additional Info

Capital Stock - Additional Information (Detail) - USD ($)	May 25, 2021	May 29, 2020	Mar. 16, 2020	May 29, 2019	Jun. 30, 2021	Jun. 30, 2021	Apr. 30, 2021	Oct. 31, 2021	Oct. 31, 2020	Jan. 31, 2021
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
Stock repurchased during period, cash								$ 0	$ 1,000,000
2012 Equity Incentive Plan [Member]
Class Of Stock [Line Items]
Additional ordinary shares reserved for issuance						0	1,599,634
2021 Equity Incentive Plan [Member]
Class Of Stock [Line Items]
Additional ordinary shares reserved for issuance					1,350,000
Maximum number of ordinary shares reserved for issuance					6,834,208	6,834,208
Amended and Restated 2012 Employee Stock Purchase Plan [Member]
Class Of Stock [Line Items]
Additional ordinary shares reserved for issuance							444,343
Amended and Restated 2012 Employee Stock Purchase Plan [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 $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					0
Stock repurchased during period, cash			$ 1,000,000
Stock repurchase program, extended expiration period	12 months	12 months
Stock repurchase program, extended expiration date	Jun. 30, 2022	Jun. 30, 2021
Amount available under stock repurchase program								$ 49,000,000
Stock Repurchase Program $50.0 Million Authorization [Member] | Maximum [Member]
Class Of Stock [Line Items]
Amount authorized under stock repurchase program				$ 50,000,000

Capital Stock - Schedule of Ord

Capital Stock - Schedule of Ordinary Shares Reserved for Future Issuance under EIP and ESPP (Detail) - shares	Oct. 31, 2021	Jan. 31, 2021
EIP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved	7,671,344	5,981,741
ESPP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved	2,624,704	2,299,143

Stock-based Compensation - Clas

Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Stock-based compensation:
Total stock-based compensation	$ 22,053	$ 18,977	$ 60,267	$ 51,407
Cost of revenue [Member]
Stock-based compensation:
Total stock-based compensation	391	368	1,073	981
Research and development [Member]
Stock-based compensation:
Total stock-based compensation	13,725	11,496	36,444	31,402
Selling, general and administrative [Member]
Stock-based compensation:
Total stock-based compensation	$ 7,937	$ 7,113	$ 22,750	$ 19,024

Stock-based Compensation - Addi

Stock-based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Oct. 31, 2021USD ($)$ / shares	Oct. 31, 2021USD ($)$ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Accrued share based compensation expense	$ 1.7	$ 5.1
Closing price of ordinary shares | $ / shares	$ 185.83	$ 185.83
Stock options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost, stock options	$ 2.4	$ 2.4
Weighted average recognition period		2 years 1 month 17 days
Restricted stock units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost, restricted stock units	198.6	$ 198.6
Weighted average recognition period		2 years 5 months 12 days
Aggregate intrinsic value of unvested restricted stock units	$ 540.1	$ 540.1

Stock-based Compensation - Weig

Stock-based Compensation - Weighted-Average Assumptions Used to Estimate Fair Value (Detail)	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Stock options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Volatility		52.00%	51.00%	52.00%
Risk-free interest rate		0.40%	0.98%	0.52%
Expected term (years)		5 years 9 months 21 days	5 years 3 months 7 days	5 years 10 months 2 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	54.00%	58.00%	57.00%	59.00%
Risk-free interest rate	0.05%	0.12%	0.06%	0.21%
Expected term (years)	6 months	6 months	6 months	6 months
Dividend yield	0.00%	0.00%	0.00%	0.00%

Stock-based Compensation - Stoc

Stock-based Compensation - Stock Option Activities (Detail) $ / shares in Units, $ in Thousands	9 Months Ended
	Oct. 31, 2021USD ($)$ / sharesshares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Outstanding | shares	719,143
Shares, Granted | shares	14,700
Shares, Exercised | shares	(229,051)
Shares, Forfeited | shares	(7,401)
Shares, Expired | shares	(1,146)
Shares, Outstanding | shares	496,245
Shares, Exercisable | shares	411,465
Weighted-Average Exercise Price, Outstanding	$ 38.33
Weighted-Average Exercise Price, Granted	110.19
Weighted-Average Exercise Price, Exercised	25.37
Weighted-Average Exercise Price, Forfeited	69.40
Weighted-Average Exercise Price, Expired	9.86
Weighted-Average Exercise Price, Outstanding	46.05
Weighted-Average Exercise Price, Exercisable	42.64
Weighted-Average Grant-date Fair Value, Granted	$ 50.28
Total Intrinsic Value Of Options Exercised | $	$ 19,201
Weighted-Average Remaining Contractual Term, Outstanding	4 years 7 months 20 days
Weighted-Average Remaining Contractual Term, Exercisable	3 years 10 months 24 days
Aggregate Intrinsic Value, Outstanding | $	$ 69,365
Aggregate Intrinsic Value, Exercisable | $	$ 58,916

Stock-based Compensation - Rest

Stock-based Compensation - Restricted Stock Units Activities (Detail) - Restricted Stock Units [Member]	9 Months Ended
	Oct. 31, 2021$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Unvested, beginning balance | shares	2,871,801
Shares, Granted | shares	1,113,417
Shares, Vested | shares	(1,029,869)
Shares, Forfeited | shares	(48,983)
Shares, Unvested, ending balance | shares	2,906,366
Weighted-Average Grant-Date Fair Value, Unvested, beginning balance | $ / shares	$ 51.73
Weighted-Average Grant-Date Fair Value, Granted | $ / shares	122.39
Weighted-Average Grant-Date Fair Value, Vested | $ / shares	50.81
Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares	66.60
Weighted-Average Grant-Date Fair Value, Unvested, ending balance | $ / shares	$ 78.88

Net Income (Loss) Per Ordinar_3

Net Income (Loss) Per Ordinary Share - Computation of Basic and Diluted Net Income (Loss) Per Ordinary Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Oct. 31, 2021	Jul. 31, 2021	Apr. 30, 2021	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Oct. 31, 2021	Oct. 31, 2020
Numerator:
Net income (loss)	$ 756	$ (7,156)	$ (10,818)	$ (17,078)	$ (14,756)	$ (15,463)	$ (17,218)	$ (47,297)
Denominator:
Weighted-average ordinary shares - basic	36,792,187			34,819,880			36,391,676	34,460,172
Weighted-average ordinary shares - diluted	39,046,274			34,819,880			36,391,676	34,460,172
Net income (loss) per ordinary share:
Basic	$ 0.02			$ (0.49)			$ (0.47)	$ (1.37)
Diluted	$ 0.02			$ (0.49)			$ (0.47)	$ (1.37)
Stock options [Member]
Effect of potentially dilutive securities:
Effect of potentially dilutive securities	327,417
Restricted stock units [Member]
Effect of potentially dilutive securities:
Effect of potentially dilutive securities	1,921,723
Employee stock purchase plan awards [Member]
Effect of potentially dilutive securities:
Effect of potentially dilutive securities	4,947

Net Income (Loss) Per Ordinar_4

Net Income (Loss) Per Ordinary Share - Weighted-Average Potentially Dilutive Securities Excluded from Computation of Diluted Net Income (Loss) Per Ordinary Share (Detail) - shares	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of earnings per share	16,896	1,957,936	1,383,806	2,077,682
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	13,399	701,113	269,713	734,506
Restricted stock units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of earnings per share	51	1,233,679	1,105,083	1,316,682
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	3,446	23,144	9,010	26,494

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Income Tax Disclosure [Abstract]
Loss before income taxes	$ (804)	$ (15,576)	$ (16,089)	$ (43,922)
Provision (benefit) for income taxes	$ (1,560)	$ 1,502	$ 1,129	$ 3,375
Effective tax rate	194.20%	(9.60%)	(7.00%)	(7.70%)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Income Taxes [Line Items]
Provision (benefit) for income taxes	$ (1,560)	$ 1,502	$ 1,129	$ 3,375
Unrecognized tax benefits	$ 28,100		$ 28,100
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			2020
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			2020
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			2020

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Oct. 31, 2021	Jan. 31, 2021
Loss Contingencies [Line Items]
Total manufacturing purchase commitments	$ 66,000,000	$ 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

Segment Reporting - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021USD ($)	Oct. 31, 2020	Oct. 31, 2021USD ($)Segment	Oct. 31, 2020	Jan. 31, 2021USD ($)
Concentration Risk [Line Items]
Number of reportable segment | Segment			1
Property and equipment, net	$ 8,498		$ 8,498		$ 5,530
Accounts receivable	$ 44,776		$ 44,776		$ 24,974
Sales revenue, net [Member] | Wintech [Member] | Customer concentration risk [Member]
Concentration Risk [Line Items]
Percentage of revenue	63.10%	62.30%	62.70%	60.40%
Sales revenue, net [Member] | Chicony [Member] | Customer concentration risk [Member]
Concentration Risk [Line Items]
Percentage of revenue	13.40%	17.60%	14.90%	17.40%
Accounts receivable [Member] | Wintech [Member] | Credit concentration risk [Member]
Concentration Risk [Line Items]
Accounts receivable	$ 23,500		$ 23,500
Accounts receivable [Member] | Chicony [Member] | Credit concentration risk [Member]
Concentration Risk [Line Items]
Accounts receivable	12,400		12,400
United States [Member]
Concentration Risk [Line Items]
Property and equipment, net	3,100		3,100
Asia Pacific [Member]
Concentration Risk [Line Items]
Property and equipment, net	4,000		4,000
Europe [Member]
Concentration Risk [Line Items]
Property and equipment, net	$ 1,500		$ 1,500

Segment Reporting - Company's R

Segment Reporting - Company's Revenue by Geographic Region Based on Bill-to Location (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Revenue from External Customer [Line Items]
Total revenue	$ 92,167	$ 56,090	$ 241,627	$ 160,848
Taiwan [Member]
Revenue from External Customer [Line Items]
Total revenue	59,412	35,073	153,135	96,846
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	21,323	14,642	60,122	43,635
Europe [Member]
Revenue from External Customer [Line Items]
Total revenue	4,432	1,970	11,837	6,856
North America other than United States [Member]
Revenue from External Customer [Line Items]
Total revenue	5,984	2,433	13,117	8,449
United States [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 1,016	$ 1,972	$ 3,416	$ 5,062

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - Oculii Corporation [Member] - USD ($) $ in Millions	Nov. 05, 2021	Oct. 31, 2021
Subsequent Event [Member]
Subsequent Event [Line Items]
Voting right acquired	100.00%
Aggregate consideration paid for business acquisition	$ 307.5
Operating Expenses [Member]
Subsequent Event [Line Items]
Acquisition related costs		$ 1.6