Calix (CALX) 10-K 21 Feb 23 2022 FY Annual report Financial data

Cover

Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Feb. 10, 2023	Jul. 01, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-34674
Entity Registrant Name	Calix, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	68-0438710
Entity Address, Address Line One	2777 Orchard Parkway
Entity Address, City or Town	San Jose
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95134
City Area Code	408
Local Phone Number	514-3000
Title of 12(b) Security	Common Stock, $0.025 par value
Trading Symbol	CALX
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 2,002
Entity Common Stock, Shares Outstanding		66,139,488
Entity Central Index Key	0001406666
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s definitive proxy statement for its 2023 annual meeting of stockholders are incorporated by reference in Items 10, 11, 12, 13 and 14 of Part III.

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2022
Audit Information [Abstract]
Auditor Name	KPMG LLP
Auditor Location	Santa Clara, California
Auditor Firm ID	185

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 79,073	$ 51,333
Marketable securities	162,642	153,002
Accounts receivable, net	93,804	85,219
Inventory	149,160	88,880
Prepaid expenses and other current assets	62,691	30,811
Total current assets	547,370	409,245
Property and equipment, net	25,834	21,783
Right-of-use operating leases	9,283	12,182
Deferred tax assets	167,031	168,962
Goodwill	116,175	116,175
Other assets	19,142	13,685
Total assets	884,835	742,032
Current liabilities:
Accounts payable	41,407	29,061
Accrued liabilities	90,474	71,597
Deferred revenue	33,541	27,478
Total current liabilities	165,422	128,136
Long-term portion of deferred revenue	25,072	22,016
Operating leases	8,442	12,376
Other long-term liabilities	6,332	11,076
Total liabilities	205,268	173,604
Commitments and contingencies (See Note 5)
Stockholders’ equity:
Preferred stock, $0.025 par value; 5,000 shares authorized; no shares issued and outstanding as of December 31, 2022 and 2021	0	0
Common stock, $0.025 par value; 100,000 shares authorized; 65,735 shares issued and outstanding as of December 31, 2022, and 64,274 shares issued and outstanding as of December 31, 2021	1,644	1,607
Additional paid-in capital	1,070,100	997,855
Accumulated other comprehensive loss	(2,473)	(320)
Accumulated deficit	(389,704)	(430,714)
Total stockholders’ equity	679,567	568,428
Total liabilities and stockholders' equity	$ 884,835	$ 742,032

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.025	$ 0.025
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.025	$ 0.025
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	65,735,000	64,274,000
Common stock, shares outstanding (in shares)	65,735,000	64,274,000

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenue	$ 867,827	$ 679,394	$ 541,239
Cost of revenue	432,399	322,807	274,220
Gross profit	435,428	356,587	267,019
Operating expenses:
Sales and marketing	174,549	125,909	94,185
Research and development	131,994	101,747	85,258
General and administrative	76,275	55,779	44,444
Restructuring charges (benefit)	0	(786)	6,286
Total operating expenses	382,818	282,649	230,173
Operating income	52,610	73,938	36,846
Interest and other income (expense), net:
Interest income (expense), net	2,009	(402)	(1,585)
Other expense, net	(577)	(882)	(977)
Total interest and other income (expense), net	1,432	(1,284)	(2,562)
Income before income taxes	54,042	72,654	34,284
Income taxes	13,032	(165,724)	800
Net income	$ 41,010	$ 238,378	$ 33,484
Net income per common share:
Basic (in dollars per share)	$ 0.63	$ 3.77	$ 0.57
Diluted (in dollars per share)	$ 0.60	$ 3.51	$ 0.54
Weighted-average number of shares used to compute net income per common share:
Basic (in shares)	65,058	63,277	59,074
Diluted (in shares)	68,911	67,856	61,998
Net income	$ 41,010	$ 238,378	$ 33,484
Other comprehensive income (loss), net of tax:
Unrealized loss on available-for-sale marketable securities, net	(1,521)	(179)	0
Foreign currency translation adjustments, net	(632)	50	663
Total other comprehensive income (loss), net of tax	(2,153)	(129)	663
Comprehensive income	$ 38,857	$ 238,249	$ 34,147

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Treasury Stock
Beginning balance, shares at Dec. 31, 2019		56,448
Balance at beginning of period at Dec. 31, 2019	$ 154,028	$ 1,545	$ 895,899	$ (854)	$ (702,576)	$ (39,986)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	13,960		13,960
Issuance of common stock under equity incentive plans, net of forfeitures (in shares)		2,454
Issuance of common stock under equity incentive plans, net of forfeitures	18,127	$ 60	18,067
Issuance of common stock in connection with public offering, net of expenses (in shares)		3,220
Issuance of common stock in connection with public offering, net of expenses	60,063	$ 82	59,981
Treasury stock retirement	0	$ (134)	(39,852)			39,986
Net income	33,484				33,484
Other comprehensive income (loss)	663			663
Ending balance, shares at Dec. 31, 2020		62,122
Balance at end of period at Dec. 31, 2020	280,325	$ 1,553	948,055	(191)	(669,092)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	24,230		24,230
Issuance of common stock under equity incentive plans, net of forfeitures (in shares)		2,152
Issuance of common stock under equity incentive plans, net of forfeitures	25,624	$ 54	25,570
Net income	238,378				238,378
Other comprehensive income (loss)	$ (129)			(129)
Ending balance, shares at Dec. 31, 2021	64,274	64,274
Balance at end of period at Dec. 31, 2021	$ 568,428	$ 1,607	997,855	(320)	(430,714)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	44,826		44,826
Issuance of common stock under equity incentive plans, net of forfeitures (in shares)		1,461
Issuance of common stock under equity incentive plans, net of forfeitures	27,456	$ 37	27,419
Net income	41,010				41,010
Other comprehensive income (loss)	$ (2,153)			(2,153)
Ending balance, shares at Dec. 31, 2022	65,735	65,735
Balance at end of period at Dec. 31, 2022	$ 679,567	$ 1,644	$ 1,070,100	$ (2,473)	$ (389,704)	$ 0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities:
Net income	$ 41,010	$ 238,378	$ 33,484
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	44,826	24,230	13,960
Depreciation and amortization	14,315	15,012	13,718
Deferred income taxes	1,932	(168,426)	0
Net accretion of available-for-sale securities	(1,146)	0	0
Asset retirements and write-downs	0	0	3,914
Changes in operating assets and liabilities:
Accounts receivable, net	(8,585)	(15,800)	(22,910)
Inventory	(60,280)	(36,612)	(12,116)
Prepaid expenses and other assets	(38,359)	(27,074)	773
Accounts payable	12,111	16,025	2,190
Accrued liabilities	20,919	3,273	11,922
Deferred revenue	9,118	10,400	3,596
Other long-term liabilities	(8,678)	(2,613)	2,878
Net cash provided by operating activities	27,183	56,793	51,409
Investing activities:
Purchases of property and equipment	(14,067)	(10,463)	(7,819)
Purchases of marketable securities	(191,403)	(298,092)	(72,982)
Maturities of marketable securities	181,388	197,894	20,000
Net cash used in investing activities	(24,082)	(110,661)	(60,801)
Financing activities:
Proceeds from common stock issuances related to employee benefit plans	27,456	25,624	18,127
Payments related to financing arrangements	(2,393)	(1,241)	(5,758)
Proceeds from the sale of common stock in connection with public offering, net of expenses	0	0	60,063
Proceeds from line of credit	0	0	30,000
Payments related to the line of credit	0	0	(60,285)
Net cash provided by financing activities	25,063	24,383	42,147
Effect of exchange rate changes on cash and cash equivalents	(424)	11	595
Net increase (decrease) in cash and cash equivalents	27,740	(29,474)	33,350
Cash and cash equivalents at beginning of year	51,333	80,807	47,457
Cash and cash equivalents at end of year	79,073	51,333	80,807
Supplemental disclosures of cash flow information:
Interest paid	577	631	1,686
Income taxes paid	9,607	5,197	751
Non-cash investing activities:
Changes in accounts payable and accrued liabilities related to purchases of property and equipment	$ 586	$ 194	$ (597)

Description of Business and Sig

Description of Business and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Description of Business and Significant Accounting Policies	Description of Business and Significant Accounting Policies Company Calix, Inc. (together with its subsidiaries, “Calix” or the “Company”) was incorporated in August 1999 and is a Delaware corporation. The Company is the leading global provider of a platform (cloud, software and systems) and managed services that focus on the subscriber-facing network, the portion of the network that governs available bandwidth and determines the range and quality of services that can be offered to subscribers. This platform and managed services enable broadband service providers (“BSPs”) of all sizes to innovate and transform their businesses. The Company’s BSP customers are empowered to utilize real-time data and insights from the Calix platform to simplify their businesses and deliver experiences that excite their subscribers. These insights enable BSPs to grow their businesses through increased subscriber acquisition, loyalty and revenue, thereby increasing the value of their businesses and contributions to their communities. Basis of Presentation and Accounting Guidance The accompanying consolidated financial statements have been prepared in accordance with the requirements of the U.S. Securities and Exchange Commission (“SEC”) and U.S. generally accepted accounting principles (“GAAP”). All significant intercompany balances and transactions have been eliminated in consolidation. Any reference in these notes to applicable accounting guidance is meant to refer to the authoritative U.S. GAAP as found in the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”). Use of Estimates The preparation of financial statements is in conformity with U.S. GAAP, which requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. For the Company, these estimates include, but are not limited to: allowances for doubtful accounts and sales returns, excess and obsolete inventory, allowances for obligations to its contract manufacturers, valuation of stock-based compensation, useful lives assigned to long-lived assets, standard and extended warranty costs, realizability of deferred tax assets and uncertain tax positions and contingencies. Actual results could differ from those estimates, and such differences could be material to the Company’s financial position and results of operations. Revenue Recognition Revenue is recognized when a performance obligation is satisfied, which occurs when control of the promised goods or services is transferred to the customer, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. Revenue from sales of access and premises systems is recognized when control is transferred to the customer, which is generally when the products are shipped. Revenue from software platform licenses, which provides the customer with a right to use the software as it exists, is generally recognized upfront when made available to the customer. Revenue from cloud-based software subscriptions, customer support, maintenance, extended warranty subscriptions and managed services is generally recognized ratably over the contract term. Revenue from professional services and training is recognized as the services are delivered. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer and is the unit of account. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The Company’s hardware products contain both software and non-software components that function together to deliver the products’ essential functionality and therefore constitutes a single performance obligation as the promise to transfer the individual software and non-software components is not separately identifiable and, therefore, not distinct. Cloud-based software subscriptions can include multi-year agreements with a fixed annual fee for a minimum committed usage level. To the extent that minimum committed usage level each year varies, the Company has concluded that each year represents a distinct stand-ready performance obligation and the transaction price allocated to each performance obligation is recognized as revenue ratably over each annual period. The Company’s contracts may include multiple performance obligations. For such arrangements, the Company allocates the contract’s transaction price to each performance obligation using the relative stand-alone selling price of each distinct good or service in the contract. The Company generally determines stand-alone selling prices based on the prices charged to customers or its best estimate of stand-alone selling price. The Company’s estimate of stand-alone selling price is established considering multiple factors including, but not limited to, geographies, market conditions, competitive landscape, internal costs, gross margin objectives, characteristics of targeted customers and pricing practices. The determination of estimated stand-alone selling price is made through consultation with and formal approval by management, taking into consideration the go-to-market strategy. Cost of Revenue Cost of revenue consists primarily of finished goods inventory purchased from the Company’s contract manufacturers, payroll and related expenses associated with managing the relationships with contract manufacturers, depreciation of manufacturing test equipment, warranty and retrofit costs, excess and obsolete inventory costs, allowances for obligations to its contract manufacturers, shipping charges and amortization of certain intangible assets. It also includes contractor and other costs of services incurred directly related to the delivery of services to customers. Warranty and Retrofit The Company offers limited warranties for its hardware products for a period of one three Stock-Based Compensation Stock-based compensation expense associated with stock options and purchase rights under the Amended and Restated Employee Stock Purchase Plan (the “ESPP”) and the Amended and Restated 2017 Nonqualified Employee Stock Purchase Plan (the “NQ ESPP”) is measured at the grant date based on the fair value of the award and is recognized, net of forfeitures, as expense over the remaining requisite service period (generally the vesting period) on a straight-line basis. The fair value of stock option and employee stock purchase right under the ESPP is estimated at the grant date using the Black-Scholes option valuation model. The fair value of the employee stock purchase right under the NQ ESPP is based on closing market price of the Company’s common stock on the date of grant. Stock-based compensation expense associated with performance stock options (“PSOs”) with graded vesting features and which contain both a performance and a service condition is measured based on fair value of stock options estimated at the grant date using the Black-Scholes option valuation model, and is recognized, net of forfeitures, as expense over the requisite service period using the graded vesting attribution method. Compensation expense is only recognized if the Company has determined that it is probable that the performance condition will be met. The Company reassesses the probability of vesting at each reporting period and adjusts compensation expense based on its probability assessment. Loss Contingencies From time to time, the Company is involved in legal proceedings arising from the normal course of business activities. The Company evaluates the likelihood of an unfavorable outcome of legal proceedings to which it is a party and accrues a loss contingency when the loss is probable and reasonably estimable. Assessing legal contingencies involves significant judgment and estimates, and the outcome of litigation is inherently uncertain and subject to numerous factors outside the Company’s control. Significant judgment is required when the Company assesses the likelihood of any adverse judgments or outcomes, including the potential range of possible losses, and whether losses are probable and reasonably estimable. Because of uncertainties related to these matters, the Company bases its estimates of whether a loss contingency is probable or reasonably possible, as well as the reasonable range of possible losses associated with each loss contingency, only on the information available at the time. As additional information becomes available, and at least quarterly, the Company reassesses the potential liability on each significant matter and may revise its estimates. These revisions could have a material impact on the Company’s business, operating results or financial condition. The actual outcome of these legal proceedings may materially differ from the Company’s estimates of potential liability, which could have a material adverse effect on the Company’s business, operating results or financial condition. Credit Risk and Inventory Supplier Concentrations Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash, cash equivalents, marketable securities and accounts receivable. Cash equivalents consist of money market funds and marketable securities with a maturity at the date of purchase of ninety days or less, which are invested through financial institutions in the United States. Deposits in and investments held by these financial institutions may, at times, exceed federally insured limits. The Company has not experienced any losses in such accounts. The Company also has approximately $2.7 million of cash held by its foreign subsidiaries in India, China and the United Kingdom. Management believes that the financial institutions that hold the Company’s cash and cash equivalents are financially sound and, accordingly, minimal credit risk exists with respect to these cash and cash equivalents. The Company depends primarily on a small number of outside contract manufacturers (“CMs”) and original design manufacturers (“ODMs”) for the bulk of its finished goods inventory. The Company generally purchases its products through purchase orders with its suppliers. While the Company seeks to maintain a sufficient supply of its products, the Company’s business and results of operations could be adversely affected by a stoppage or delay in receiving such products, the receipt of defective parts, an increase in price of such products or the Company’s inability to obtain lower prices from its CMs, ODMs and other suppliers in response to competitive pressures. Fair Value of Financial Instruments The carrying amounts of cash and cash equivalents, trade receivables, accounts payable and other accrued liabilities approximate their fair value due to their relatively short-term nature. Marketable securities are valued using quoted market prices in active markets to determine fair value. Cash, Cash Equivalents and Marketable Securities Cash equivalents and marketable securities are stated at amounts that approximate fair value based on quoted market prices. The Company has invested its excess cash primarily in money market funds and highly liquid marketable securities such as U.S. treasury securities, corporate debt instruments, commercial paper and U.S. government securities. The Company considers all investments with maturities of three months or less when purchased to be cash equivalents. Marketable securities represent highly liquid U.S. treasury securities, corporate debt instruments, commercial paper and U.S. government securities with maturities greater than 90 days at date of purchase. Marketable securities with maturities greater than one year are classified as current because management considers all marketable securities to be available for current operations. The Company’s investments have been classified and accounted for as available-for-sale. Such investments are recorded at fair value and unrealized holding gains and losses are reported as a separate component of comprehensive loss in the stockholders’ equity until realized. Realized gains and losses on sales of marketable securities, if any, are determined on the specific identification method and are reclassified from accumulated other comprehensive loss to results of operations as “Other income (expense), net.” Realized gains and losses were not significant for the years ended December 31, 2022 and 2021, respectively. For the Company’s available-for-sale debt securities in an unrealized loss position, the Company determines whether a credit loss exists. In this assessment, among other factors, the Company considers the extent to which the fair value is less than the amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security. If factors indicate a credit loss exists, an allowance for credit loss will be recorded to “Other income (expense), net,” limited by the amount that the fair value is less than the amortized cost basis. The amount of fair value change relating to all other factors will be recognized in other comprehensive loss. See Note 2 “ Cash, Cash Equivalents and Marketable Securities.” Allowance for Doubtful Accounts The Company maintains an allowance for doubtful accounts for expected credit losses at contract inception resulting from the inability of its customers to make required payments. The Company records a specific allowance and revises the expected loss based on an analysis of individual past-due balances. Additionally, based on historical write-offs and the Company’s collection experience, the Company records an additional allowance based on a percentage of outstanding receivables. The Company performs credit evaluations of its customers’ financial condition. These evaluations require judgment and are based on a variety of factors including, but not limited to, current economic trends, payment history and a financial review of the customer. Actual collection losses may differ from management’s estimates, and such differences could be material to the Company's financial position and results of operations. Inventory Valuation and Supplier Purchase Commitments Inventory, which primarily consists of finished goods purchased from CMs or ODMs, is stated at the lower of cost (determined by the first-in, first-out method) or market value. Inbound shipping costs and U.S. tariffs are included in cost of inventory. In addition, from time to time, the Company procures component inventory primarily as a result of manufacturing discontinuation of critical components by suppliers. The Company regularly monitors inventory quantities on hand and records write-downs for excess and obsolete inventories based on the Company’s estimate of demand for its products, potential obsolescence of technology, product life cycles and whether pricing trends or forecasts indicate that the carrying value of inventory exceeds its estimated selling price. The Company also evaluates its supplier purchase commitments, which have increased significantly due to extended lead-times in the current supply chain environment, and records a liability for excess and obsolete components based on its estimated demand of our products, potential obsolescence of technology and product life cycles. These factors are impacted by market and economic conditions, technology changes and new product introductions and require significant estimates that may include elements that are uncertain. Actual demand may differ from forecasted demand and may have a material effect on gross profit. If inventory is written down, a new cost basis is established that cannot be increased in future periods. Shipments from suppliers before the Company receives them are recorded as in-transit inventory when title and the significant risks and rewards of ownership have passed to the Company. Contract Costs The Company capitalizes certain sales commissions related primarily to multi-year cloud-based software subscriptions and extended warranty support contracts. Capitalized commissions are amortized as sales and marketing expenses over the period that the related revenue is recognized, which can be up to five years for extended warranty. The Company classifies the unamortized portion of deferred commissions as current or noncurrent based on the timing of when the Company expects to recognize the expense. The current and noncurrent portions of deferred commissions are included in “Prepaid expenses and other current assets” and “Other assets,” respectively, in the Company’s Consolidated Balance Sheets. Property and Equipment Property and equipment are stated at cost, less accumulated depreciation, and are depreciated using the straight-line method over the estimated useful life of each asset. Generally, computer equipment is depreciated over two years; purchased software is depreciated over three Goodwill Goodwill was recorded as a result of the Company’s acquisitions of Occam Networks, Inc. in February 2011 and Optical Solutions, Inc. in February 2006. The Company records goodwill when consideration paid in a business acquisition exceeds the fair value of the net tangible assets and the identified intangible assets acquired. Goodwill is not amortized but instead is subject to an annual impairment test or more frequently if events or changes in circumstances indicate that it may be impaired. The Company evaluates goodwill on an annual basis as of the end of the second quarter of each fiscal year. Management has determined that it operates as a single reporting unit and, therefore, evaluates goodwill impairment at the enterprise level. At the end of the second quarter of 2022, the Company completed its annual goodwill impairment test. Based on its assessment of certain qualitative factors such as market capitalization, management concluded that the fair value of the Company was more likely than not greater than its carrying amount as of July 2, 2022. As such, it was not necessary to perform the two-step quantitative goodwill impairment test at the time. There have been no significant events or changes in circumstances subsequent to the 2022 annual impairment test that would more likely than not indicate that the carrying value of goodwill may have been impaired as of December 31, 2022. There were no impairment losses for goodwill for the years ended December 31, 2022, 2021 or 2020. Deferred Revenue Deferred revenue results from transactions where the Company billed the customer for products or services and when cash payments are received or due prior to transferring control of the promised goods or services to the customer. Payment terms to customers typically range from net 30 to net 90 days and vary by the size and location of customer and the products or services offered. The period between the transfer of control of the promised good or service to a customer and when payment is due is not significant. Income Taxes The Company evaluates its tax positions and estimates its current tax exposure along with assessing temporary differences that result from different book to tax treatment of items not currently deductible for tax purposes. These differences result in deferred tax assets and liabilities on the Company’s Consolidated Balance Sheets, which are estimated based upon the difference between the financial statement and tax bases of assets and liabilities using the enacted tax rates that will be in effect when these differences reverse. In general, deferred tax assets represent future tax benefits to be received when certain expenses previously recognized in the Company’s Consolidated Statements of Comprehensive Income become deductible expenses under applicable income tax laws or loss or credit carryforwards are utilized. Accordingly, realization of the Company’s deferred tax assets is dependent on future taxable income against which these deductions, losses and credits can be utilized. The Company must assess the likelihood that deferred tax assets will be recovered from future taxable income, and if the Company determines that recovery is not more likely than not, the Company must establish a valuation allowance. Management judgment is required in determining its provision for income taxes, deferred tax assets and liabilities and any valuation allowance recorded against its net deferred tax assets. In the third quarter of 2021, the Company reversed the majority of its valuation allowance and recorded on its balance sheet U.S. federal and certain state deferred tax assets of $162.0 million. As of December 31, 2022, the Company determined that positive evidence continues to outweigh negative evidence and concluded that it was more likely than not that its U.S. federal and state (with the exception of California) deferred tax assets are realizable. The Company currently maintains a valuation allowance of $29.9 million for certain U.S. federal and California deferred tax assets. Newly Adopted Accounting Standards The Company did not adopt any new accounting standards in 2022 that were significant to the Company. Recent Accounting Pronouncements Not Yet Adopted There have been no accounting pronouncements or changes in accounting pronouncements that are significant or potentially significant to the Company.

Cash, Cash Equivalents and Mark

Cash, Cash Equivalents and Marketable Securities	12 Months Ended
	Dec. 31, 2022
Cash and Cash Equivalents [Abstract]
Cash, Cash Equivalents and Marketable Securities	Cash, Cash Equivalents and Marketable Securities Cash, cash equivalents and marketable securities consisted of the following (in thousands): December 31, 2022 2021 Cash and cash equivalents: Cash $ 39,189 $ 26,442 Commercial paper 33,199 21,582 U.S. government securities 5,990 — Money market funds 555 2,320 Corporate debt securities 140 989 Total cash and cash equivalents 79,073 51,333 Marketable securities: U.S. government securities 106,750 60,279 Commercial paper 28,992 80,812 U.S. government agency securities 23,632 5,527 Corporate debt securities 3,168 3,576 Municipal securities 100 2,808 Total marketable securities 162,642 153,002 $ 241,715 $ 204,335 The carrying amounts of the Company’s money market funds approximate their fair values due to their nature, duration and short maturities. As of December 31, 2022, all marketable securities were due in two years or less. The amortized cost and fair value of marketable securities as of December 31, 2022 were as follows (in thousands): Amortized Cost Gross Unrealized Losses Fair Value U.S. government securities $ 114,119 $ (1,379) $ 112,740 Commercial paper 62,262 (71) 62,191 U.S. government agency securities 23,876 (244) 23,632 Corporate debt securities 3,312 (4) 3,308 Municipal securities 101 (1) 100 Total marketable securities $ 203,670 $ (1,699) $ 201,971 Unrealized gains and losses were not significant as of December 31, 2021.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company measures its cash equivalents and marketable securities at fair value on a recurring basis. Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. The Company utilizes the following three-tier value hierarchy which prioritizes the inputs used in measuring fair value: Level 1 – Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2 – Observable inputs other than quoted prices included in Level 1 for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-driven valuations in which all significant inputs and significant value drivers are observable in active markets. Level 3 – Unobservable inputs to the valuation derived from fair valuation techniques in which one or more significant inputs or significant value drivers are unobservable. The fair value hierarchy also requires the Company to maximize the use of observable inputs, when available, and to minimize the use of unobservable inputs when determining inputs and determining fair value. The following tables sets forth the Company’s financial assets measured at fair value on a recurring basis based on the three-tier fair value hierarchy (in thousands): As of December 31, 2022 Level 1 Level 2 Total Money market funds $ 555 $ — $ 555 U.S. government securities 112,740 — 112,740 Commercial paper — 62,191 62,191 U.S. government agency securities — 23,632 23,632 Corporate debt securities — 3,308 3,308 Municipal securities — 100 100 $ 113,295 $ 89,231 $ 202,526 As of December 31, 2021 Level 1 Level 2 Total Money market funds $ 2,320 $ — $ 2,320 U.S. government securities 60,279 — 60,279 Commercial paper — 102,394 102,394 U.S. government agency securities — 5,527 5,527 Corporate debt securities — 4,565 4,565 Municipal securities — 2,808 2,808 $ 62,599 $ 115,294 $ 177,893

Balance Sheet Details

Balance Sheet Details	12 Months Ended
	Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Details	Balance Sheet Details Accounts receivable, net consisted of the following (in thousands): December 31, 2022 2021 Accounts receivable $ 94,201 $ 85,944 Allowance for doubtful accounts (397) (725) $ 93,804 $ 85,219 The table below summarizes the changes in allowance for doubtful accounts and product return liability for the periods indicated (in thousands): Balance at Beginning of Year Additions Charged to Expenses or Revenue Net of Recoveries Write Offs and Returns Balance at Year Ended December 31, 2022: Allowance for doubtful accounts $ 725 $ (276) $ (52) $ 397 Product return liability 1,836 5,622 (4,497) 2,961 Year Ended December 31, 2021: Allowance for doubtful accounts $ 1,405 $ (201) $ (479) $ 725 Product return liability 1,888 3,681 (3,733) 1,836 Year Ended December 31, 2020: Allowance for doubtful accounts $ 374 $ 1,085 $ (54) $ 1,405 Product return liability 919 3,391 (2,422) 1,888 Inventory consisted of the following (in thousands): December 31, 2022 2021 Raw materials $ 640 $ 130 Finished goods 148,520 88,750 $ 149,160 $ 88,880 Prepaid expenses and other current assets consisted of the following (in thousands): December 31, 2022 2021 Supplier deposits $ 39,064 $ 6,191 Prepaid expenses and other current assets 23,627 24,620 $ 62,691 $ 30,811 Property and equipment, net consisted of the following (in thousands): December 31, 2022 2021 Test equipment $ 44,106 $ 39,476 Computer equipment 13,396 11,156 Software 10,389 9,013 Leasehold improvements 1,730 1,351 Furniture and fixtures 1,153 1,812 70,774 62,808 Accumulated depreciation and amortization (44,940) (41,025) $ 25,834 $ 21,783 Depreciation and amortization expenses were $14.3 million, $15.0 million and $13.7 million for the years ended December 31, 2022, 2021 and 2020, respectively. Other long-term assets consisted of the following (in thousands): December 31, 2022 2021 Intangible asset $ 4,253 $ 6,885 Other long-term assets 14,889 6,800 $ 19,142 $ 13,685 Intangible Asset Acquisition In March 2018, and as amended in December 2020, the Company entered into an agreement with a vendor to develop a certain software product and related enhancements pursuant to which the Company is obligated to make revenue-share payments under the program, subject to aggregate fixed revenue-share payments of $15.8 million. The payments are based on a revenue-share rate applied to revenue from the developed-product and the corresponding hardware sales through March 2024. If the minimum revenue-share payments are not achieved by the end of that period, a true-up payment will be due. As of December 31, 2022, the liability, including accrued interest, was $11.4 million, of which $7.2 million is included in “Accrued liabilities” and $4.2 million in “Other long-term liabilities” in the accompanying Consolidated Balance Sheet. As of December 31, 2021, the liability, including accrued interest, was $13.2 million, of which $4.7 million was included in “Accrued liabilities” and $8.5 million in other “Other long-term liabilities.” Accrued liabilities December 31, 2022 2021 Compensation and related benefits $ 27,813 $ 23,165 Component inventory held by suppliers 10,280 7,611 Professional and consulting fees 7,307 4,819 Current portion of revenue-share payments 7,210 4,731 Current portion of warranty and retrofit 6,377 7,076 Customer advances or rebates 5,653 4,742 Taxes payable 4,581 4,251 Operating leases 3,949 3,596 Freight 3,649 3,997 Business events 3,167 — Product returns 2,961 1,836 Other 7,527 5,773 $ 90,474 $ 71,597 Changes in the Company’s accrued warranty and retrofit liability were as follows (in thousands): Years Ended December 31, 2022 2021 2020 Balance at beginning of year $ 9,594 $ 9,208 $ 7,294 Provision for warranty and retrofit charged to cost of revenue 1,315 3,370 5,888 Utilization of reserve (2,523) (2,984) (3,974) Balance at end of year $ 8,386 $ 9,594 $ 9,208 Accrued Restructuring Charges The Company initiated a restructuring plan in 2020 to accelerate the Company’s platform future and to align with a work-from-anywhere culture. The Company incurred restructuring charges of approximately $6.3 million, consisting of facilities-related charges and severance and other termination related benefits for the year ended December 31, 2020. In the fourth quarter of 2021, as a result of subleasing the abandoned portion of the Company’s San Jose headquarters, the Company reversed $0.8 million in facilities-related charges due to the expected recovery of accrued common areas maintenance fees.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Lease Commitments The Company leases office space under non-cancelable operating leases. Certain of the Company’s operating leases contain renewal options and rent acceleration clauses. Future minimum payments under the non-cancelable operating leases consisted of the following as of December 31, 2022 (in thousands): Year Ending December 31, Future Minimum Lease Payments 2023 $ 4,629 2024 4,458 2025 3,955 2026 and thereafter 531 Total future minimum lease payments 13,573 Less imputed interest (1,182) $ 12,391 As of December 31, 2022, the operating lease liability consisted of the following (in thousands): Accrued liabilities - current portion of operating leases $ 3,949 Operating leases 8,442 $ 12,391 The Company leases its headquarters office space in San Jose, California under a lease agreement that expires in December 2025. The future minimum lease payments under the lease are $7.3 million and are included in the table for the year ended December 31, 2022 above. The above tables also include future minimum lease payments for the Company's office facilities in Petaluma, California; Plymouth, Minnesota; Richardson, Texas; Bangalore, India; Nanjing, China; and West Jordan, Utah, which expire at various dates through 2027. In November 2021, the Company entered into a sublease for a portion of the San Jose headquarters office space that was previously abandoned. The sublease commenced in August 2022 for a term of 39 months. The Company received $0.3 million in sublease income in 2022. Future minimum payments consisted of the following as of December 31, 2022 (in thousands): Year Ending December 31, Future Minimum Sublease Payments 2023 750 2024 773 2025 661 Total future minimum sublease payments $ 2,184 The weighted average discount rate for the Company’s operating leases as of December 31, 2022 was 6.1%. The weighted average remaining lease term as of December 31, 2022 was 3.0 years. For the years ended December 31, 2022, 2021 and 2020, total rent expense of the Company was $4.6 million, $4.1 million and $4.0 million, respectively. Cash paid within operating cash flows for operating leases was $4.5 million, $3.9 million and $3.8 million for years ended December 31, 2022, 2021 and 2020, respectively. Purchase Commitments The Company’s CMs and ODMs place orders for certain component inventory in advance based upon the Company’s build forecasts in order to reduce manufacturing lead times and ensure adequate component supply. The components are used by the CMs and ODMs to build the products included in the build forecasts. The Company generally does not take ownership of the components held by CMs and ODMs. The Company places purchase orders with its CMs and ODMs in order to fulfill its monthly finished product inventory requirements. The Company incurs a liability when the CMs and ODMs convert the component inventory to a finished product and takes ownership of the finished goods inventory. In the event of termination of services with a manufacturing partner, the Company has purchased, and may be required to purchase in the future, certain of the remaining components inventory held by the CM or ODM as well as any outstanding orders pursuant to the contractual provisions with such CM or ODM. As of December 31, 2022 and 2021, the Company had approximately $340.6 million and $247.3 million, respectively, of outstanding purchase commitments for inventories to be delivered by its suppliers, including CMs and ODMs. The Company has from time to time, and subject to certain conditions, reimbursed certain suppliers for component inventory purchases when this inventory has been rendered excess or obsolete, for example due to manufacturing and engineering change orders resulting from design changes, manufacturing discontinuation of products by its suppliers, or in cases where the Company has committed inventory levels that greatly exceed projected demand. The estimated excess and obsolete inventory liabilities related to such manufacturing and engineering change orders and other factors, which are included in accrued liabilities in the accompanying Consolidated Balance Sheets, were $10.3 million and $7.6 million as of December 31, 2022 and 2021, respectively. The Company records the related charges in cost of systems revenue in its Consolidated Statements of Comprehensive Income. Litigation From time to time, the Company is involved in various legal proceedings arising from the normal course of business activities. The Company is not currently a party to any legal proceedings that, if determined adversely to the Company, in management’s opinion, are currently expected to individually or in the aggregate have a material adverse effect on the Company’s business, operating results or financial condition taken as a whole. Indemnifications The Company from time to time enters into contracts that require it to indemnify various parties against claims from third parties. These contracts primarily relate to (i) certain real estate leases, under which the Company may be required to indemnify property owners for environmental and other liabilities, and other claims arising from the Company’s use of the applicable premises, (ii) agreements with the Company’s officers, directors and certain employees, under which the Company may be required to indemnify such persons for liabilities arising out of their relationship with the Company, (iii) contracts under which the Company may be required to indemnify customers against third-party claims that a Company product infringes a patent, copyright or other intellectual property right and (iv) agreements under which the Company may be required to indemnify the counterparty for certain claims that may be brought against them arising from the Company’s acts or omissions with respect to the transactions contemplated by such agreements. Because any potential obligation associated with these types of contractual provisions are not quantified or stated, the overall maximum amount of the obligation cannot be reasonably estimated. Historically, the Company has not been required to make payments under these obligations, and no liabilities have been recorded for these obligations in the accompanying Consolidated Balance Sheets.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity Preferred Stock The Board of Directors has the authority, without a further vote of the stockholders, to designate and issue up to 5.0 million shares of preferred stock in one or more series and to fix the rights, preferences, privileges and restrictions thereof. These rights, preferences and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms and the number of shares constituting any series or the designation of such series, any or all of which may be greater than the rights of common stock. The issuance of the Company’s preferred stock could adversely affect the voting power of holders of common stock and the likelihood that such holders will receive dividend payments and payments upon liquidation. In addition, the issuance of preferred stock could have the effect of delaying, deferring or preventing a change in control of the Company or other corporate action. Since the Company’s initial public offering, the Board of Directors has not designated any rights, preference or powers of any preferred stock, and no shares of preferred stock have been issued. Common Stock Holders of the Company’s common stock are entitled to receive dividends, if any, as may be declared from time to time by the Board of Directors out of legally available funds. No dividends have been declared or paid as of December 31, 2022. In August 2020, the Company completed an underwritten public offering of 3,220,000 shares of its common stock at $20.00 per share, including a full exercise by the underwriters of their option to purchase an additional 420,000 shares of Common Stock, resulting in net proceeds of $60.1 million, after deducting the underwriting discount and expenses paid by the Company. Stock Repurchase Program In July 2022, the Company’s Board of Directors authorized a one-year stock repurchase program for up to $100 million of the Company’s common stock. Under the repurchase program, repurchases can be made from time to time using a variety of methods, which may include open market purchases, privately negotiated transactions or otherwise, all in accordance with the rules of the SEC and other applicable legal requirements. The specific timing, price and size of the purchases will depend on prevailing stock prices, general economic and market conditions, and other considerations consistent with the Company’s capital allocation strategy. The repurchase program does not obligate the Company to acquire a particular amount of common stock, and the repurchase program may be suspended or discontinued at any time at the Company’s discretion. During the year ended December 31, 2022, no repurchases were made under the program. Equity Incentive Plans Stock Options At the Company’s 2019 annual meeting of stockholders, the stockholders approved the 2019 Equity Incentive Award Plan (the “2019 Plan”). The 2019 Plan supersedes and replaces the 2010 Equity Incentive Award Plan (the “2010 Plan”) and preceding plans. The terms and conditions of the 2010 Plan will continue to govern any outstanding awards granted under the 2010 Plan. Employees and consultants of the Company, its subsidiaries and affiliates and the Company’s Board of Directors members are eligible to receive awards under the 2019 Plan. The 2019 Plan provides for the grant of stock options, stock appreciation rights, restricted stock, restricted stock units or other stock or cash-based awards and dividend equivalents to eligible individuals. At the Company’s 2022 annual meeting of stockholders, the stockholders approved an increase in the number of shares of common stock issuable under the 2019 Plan by 1.5 million shares. As of December 31, 2022, there were 6.0 million shares available for issuance under the 2019 Plan. Stock options granted under the 2019 Plan are granted at a price not less than 100% of the fair market value of the common stock on the date of grant. Stock options issued under the 2019 Plan generally vest 25% on the first anniversary of the vesting commencement date and on a quarterly basis thereafter for a period of an additional three years. The options have a maximum term of ten years. In February 2021, PSOs exercisable for up to an aggregate of 0.7 million shares of common stock were granted to certain Company executives with a grant date exercise price of $36.74 per share. The actual number of shares earned is contingent upon achievement of annual corporate financial targets for bookings and non-GAAP net income for 2021 (collectively, the “2021 Performance Targets”) during the one-year performance period. Under the 2021 Performance Targets, if the non-GAAP net income is below 80% of target or bookings are below 90% of target, no shares would be awarded. From this base, shares are awarded on a 50% weighting for both non-GAAP net income and bookings up to 100% for each 2021 Performance Target using a sliding scale. In February 2022, the Compensation Committee of the Company’s Board of Directors certified the results against the 2021 Performance Targets and awarded 97% of PSOs subject to the four-year services condition. As such, 25% of the awarded shares of the PSOs were vested on that date, and the remaining 75% of the shares of common stock will vest in substantially equal quarterly installments over the subsequent 36 months, subject to the executive’s continuous service with the Company through the respective vesting dates. Stock-based compensation expense of $3.6 million and $6.3 million was recognized for the years ended December 31, 2022 and 2021, respectively, related to these awards. Also, in February 2022, the Compensation Committee granted PSOs exercisable for up to an aggregate of 0.7 million shares of common stock to certain Company executives with a grant date exercise price of $55.96 per share, using the same plan design as 2021 but with 2022 annual corporate financial targets for bookings and non-GAAP net operating income (collectively, the “2022 Performance Targets”). In February 2023, the Compensation Committee of the Company’s Board of Directors certified the results against the 2022 Performance Targets and awarded 100% of PSOs subject to the four-year service condition. As such, 25% of the awarded shares of the PSOs were vested on that date, and the remaining 75% of the shares of common stock will vest in substantially equal quarterly installments over the subsequent 36 months, subject to the executive’s continuous service with the Company through the respective vesting dates. Stock-based compensation expense of $10.1 million was recognized for the year ended December 31, 2022 related to these awards. The following table summarizes the stock option activity under the Company’s equity incentive plans (in thousands, except per share data): Weighted- Average Weighted- Remaining Average Contractual Aggregate Number of Exercise Price Life Intrinsic Stock Options Shares Per Share (in years) Value (1) Outstanding as of December 31, 2021 6,648 $ 17.46 Granted 2,423 56.04 Exercised (721) 9.28 Canceled (63) 35.74 Outstanding as of December 31, 2022 8,287 $ 29.31 7.5 $ 325,828 Vested and expected to vest as of December 31, 2022 8,028 $ 28.64 7.4 $ 321,015 Options exercisable as of December 31, 2022 4,010 $ 14.04 6.1 $ 218,143 (1) Amounts represent the difference between the exercise price and the fair market value of common stock at December 31, 2022 of $68.43 per share for all “in-the-money” options outstanding. During the years ended December 31, 2022, 2021 and 2020, total intrinsic value of stock options exercised was $31.0 million, $59.6 million and $6.7 million, respectively. Cash received from employee stock option exercises in 2022, 2021 and 2020 was $6.7 million, $11.2 million and $0.9 million, respectively. Employee Stock Purchase Plans The ESPP allows eligible employees to purchase shares of the Company’s common stock through payroll deductions of up to 15% of their eligible compensation subject to certain Internal Revenue Code limitations. In addition, participants may purchase up to 2,000 shares of common stock in each offering period. The offering periods under the ESPP are two six-month offering periods from August 15 th through February 14 th and February 15 th through August 14 th of each year. The price of common stock purchased under the ESPP is 85% of the lower of the fair market value of the common stock on the commencement date and the end date of each six-month offering period. At the Company’s 2022 annual meeting of stockholders, the stockholders approved an increase in the number of shares of common stock issuable under the ESPP by 1.3 million shares. The total shares authorized for issuance under the ESPP increased from 11.1 million shares to 12.4 million shares. As of December 31, 2022, there were 4.7 million shares available for issuance under the ESPP. During the year ended December 31, 2022, 0.2 million shares were purchased under the ESPP. As of December 31, 2022, unrecognized stock-based compensation expense of $0.4 million related to the ESPP is expected to be recognized over a remaining service period of 0.1 years. The NQ ESPP allows eligible employees to purchase shares of the Company’s common stock through payroll deductions of up to 25% of their eligible compensation. Eligible employees have the right to (a) purchase the maximum number of whole shares of common stock that can be purchased with the elected payroll deductions during each offering period for which the employee is enrolled at a purchase price equal to the closing price of the Company’s common stock on the last day of such offering period and (b) receive an equal number of shares of the Company’s common stock that are subject to a risk of forfeiture in the event the employee terminates employment within the one year period immediately following the purchase date. Beginning in the second quarter of 2022, the NQ ESPP provides quarterly offering periods from May 8 th through August 7 th , August 8 th through November 7 th , November 8 th through February 7 th and February 8 th through May 7 th of each year. A transition period began on May 15 th and ended on August 7 th . At the Company’s 2022 annual meeting of stockholders, the stockholders approved an increase in the number of shares of common stock issuable under the NQ ESPP by 0.8 million shares. The maximum number of shares of common stock currently authorized for issuance under the NQ ESPP is 6.3 million shares, with a maximum of 0.3 million shares allocated per purchase period. As of December 31, 2022, there were 3.0 million shares available for issuance under the NQ ESPP, including the stockholder-approved 0.8 million share increase. During the year ended December 31, 2022, 0.6 million shares were purchased and issued. As of December 31, 2022, unrecognized stock-based compensation expense of $9.3 million related to the NQ ESPP is expected to be recognized over a remaining weighted-average service period of 0.8 years. Stock-Based Compensation The following table summarizes stock-based compensation expense (in thousands): Years Ended December 31, 2022 2021 2020 Cost of revenue: Products $ 1,666 $ 790 $ 575 Services 1,034 668 450 Sales and marketing 12,001 6,728 4,273 Research and development 12,165 6,769 4,736 General and administrative 17,960 9,275 3,926 $ 44,826 $ 24,230 $ 13,960 Income tax benefits recognized $ 11,501 $ 16,929 $ — The following table summarizes the weighted-average grant date fair values of the Company’s stock-based awards granted in the periods indicated: Years Ended December 31, 2022 2021 2020 Stock options $ 31.86 $ 26.55 $ 8.55 ESPP $ 18.51 $ 12.93 $ 5.52 NQ ESPP $ 52.91 $ 55.50 $ 19.40 The Company values employee stock purchase rights under the NQ ESPP at the closing market price of the Company’s common stock on the date of grant. The Company estimates the fair value of stock options and employee stock purchase right under the ESPP at the grant date using the Black-Scholes option-pricing model. This model requires the use of the following assumptions: (i) Expected volatility of the Company’s common stock – The Company computes its expected volatility assumption based on a blended volatility (50% historical volatility and 50% implied volatility from traded options on the Company’s common stock). The selection of a blended volatility assumption was based upon the Company’s assessment that a blended volatility is more representative of the Company’s future stock price trend as it weighs the historical volatility with the future implied volatility. (ii) Expected life of the option award – Represents the weighted-average period that the stock options are expected to remain outstanding. The Company’s computation of expected life utilizes the simplified method in accordance with Staff Accounting Bulletin No. 110 due to the lack of sufficient historical exercise data to provide a reasonable basis upon which to estimate expected term. The mid-point between the vesting date and the expiration date is used as the expected term under this method. (iii) Expected dividend yield – The assumption is zero based on the Company’s history of not paying dividends and no future expectations of dividend payouts. (iv) Risk-free interest rate – Based on the U.S. Treasury yield curve in effect at the time of grant with maturities approximating the grant’s expected life. The following table summarizes the weighted-average assumptions used in estimating the grant-date fair value of stock options and of each employee’s purchase right under the ESPP in the periods indicated: Years Ended December 31, Stock Options 2022 2021 2020 Expected volatility 58 % 56 % 53 % Expected life (years) 6.1 6.0 6.1 Risk-free interest rate 3.15 % 1.11 % 0.48 % Years Ended December 31, ESPP 2022 2021 2020 Expected volatility 62 % 63 % 70 % Expected life (years) 0.5 0.5 0.4 Risk-free interest rate 2.16 % 0.05 % 0.12 % In addition, the Company applies an estimated forfeiture rate to awards granted and records stock-based compensation expense only for those awards that are expected to vest. Forfeiture rates are estimated at the time of grant based on the Company’s historical experience. Further, to the extent the Company’s actual forfeiture rate is different from management’s estimate, stock-based compensation is adjusted accordingly. As of December 31, 2022, unrecognized stock-based compensation expense by award type, net of estimated forfeitures, and their expected weighted-average recognition periods are summarized in the following table (in thousands). Stock Option ESPPs Unrecognized stock-based compensation expense $ 73,095 $ 9,781 Weighted-average amortization period (in years) 2.3 0.8 The Company expects to recognize stock-based compensation expense of $37.2 million in 2023, $22.0 million in 2024, $16.0 million in 2025 and $7.7 million in 2026. Shares Reserved for Future Issuance As of December 31, 2022, the Company had common shares reserved for future issuance as follows (in thousands): Stock options outstanding 8,287 Shares available for future grant under 2019 Plan 5,986 Shares available for future issuance under ESPP 4,712 Shares available for future issuance under NQ ESPP 3,043 22,028

Employee Benefit Plan

Employee Benefit Plan	12 Months Ended
	Dec. 31, 2022
Retirement Benefits [Abstract]
Employee Benefit Plan	Employee Benefit PlanThe Company sponsors a 401(k) tax-deferred savings plan for all employees who meet certain eligibility requirements. Participants may contribute, on a pre-tax basis, a percentage of their annual compensation, but not to exceed a maximum contribution amount pursuant to Section 401(k) of the Internal Revenue Code. The Company, at the discretion of the Board of Directors, may make additional matching contributions on behalf of the participants. The Company made matching contributions totaling $4.1 million, $3.2 million and $2.7 million in 2022, 2021 and 2020, respectively.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The table below summarizes the changes in accumulated other comprehensive loss by component: Unrealized Gains and Losses on Available-for-Sale Marketable Securities Foreign Currency Translation Adjustments Total Balance as of December 31, 2020 $ — $ (191) $ (191) Other comprehensive income (loss) (179) 50 (129) Balance as of December 31, 2021 (179) (141) (320) Other comprehensive loss (1,521) (632) (2,153) Balance as of December 31, 2022 $ (1,700) $ (773) $ (2,473) Assets and liabilities of the Company’s wholly owned foreign subsidiaries are translated from their respective functional currencies at exchange rates in effect at the balance sheet date, and revenue and expenses are translated at the monthly average exchanges rates. These translations result in differences called foreign currency translation adjustments. Realized foreign currency transaction gains or losses were not significant during the years ended December 31, 2022, 2021 and 2020 and are recorded in “Other income (expense), net” in the Company's Consolidated Statements of Comprehensive Income. Realized gains and losses on sales of available-for-sale marketable securities, if any, are reclassified from accumulated other comprehensive loss to “Other income (expense), net” in our Consolidated Statements of Comprehensive Income.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The domestic and foreign components of income before incomes taxes were as follows (in thousands): Years Ended December 31, 2022 2021 2020 Domestic $ 51,442 $ 70,776 $ 33,777 Foreign 2,600 1,878 507 $ 54,042 $ 72,654 $ 34,284 Income taxes consisted of the following (in thousands): Years Ended December 31, 2022 2021 2020 Current: Federal $ 3,671 $ — $ — State 6,555 2,818 285 Foreign 874 438 507 Current income tax 11,100 3,256 792 Deferred: Federal 6,336 (157,355) — State (4,372) (11,631) — Foreign (32) 6 8 Deferred income tax 1,932 (168,980) 8 $ 13,032 $ (165,724) $ 800 The differences between the statutory and effective tax rates, expressed as a percentage of net income before income taxes, were as follows: Years Ended December 31, 2022 2021 2020 Federal statutory rate 21.0 % 21.0 % 21.0 % Impact of state taxes 1.4 (15.6) 0.1 Foreign operations — (0.2) 0.6 R&D tax credits (7.4) 1.4 (4.8) Foreign income inclusion 1.0 — — Stock-based compensation — (12.8) (4.1) Other permanent items (0.2) (0.3) 0.6 Tax true-up — (0.2) (0.4) Valuation allowance (4.0) (208.3) (48.1) Net operating loss expiration / attribute expiration 5.5 (13.1) 37.4 Base erosion anti-abuse tax 6.8 — — 24.1 % (228.1) % 2.3 % The significant components of the Company’s deferred tax assets were as follows (in thousands): December 31, 2022 2021 Deferred tax assets: Net operating loss carryforwards $ 44,189 $ 82,672 Tax credit carryforwards 56,717 52,538 Accruals and reserves 11,679 10,302 Deferred revenue 13,156 11,351 Stock-based compensation 7,417 4,921 Capitalized R&D 67,932 38,842 Gross deferred tax assets 201,090 200,626 Valuation allowance (29,914) (29,236) Total deferred tax assets 171,176 171,390 Deferred tax liabilities: Fixed assets (2,648) (1,511) Intangible assets (1,497) (917) Total deferred tax liabilities (4,145) (2,428) $ 167,031 $ 168,962 All deferred taxes, along with any related valuation allowance, are classified in the Consolidated Balance Sheet as long-term. A valuation allowance is required when, based upon an assessment of various factors, including recent operating loss history, anticipated future earnings, and prudent and reasonable tax planning strategies, it is more likely than not that some portion of the deferred tax assets will not be realized. At each reporting period, the Company assesses the estimated future realizability of the gross carrying value of its deferred tax assets. The Company’s periodic assessments take into consideration both positive evidence (future profitability projections for example and recent financial performance) and negative evidence (historical financial performance for example) as it relates to evaluating the future recoverability of its deferred tax assets. During 2021, the Company released its valuation allowance for federal and state (with the exception of California) deferred tax assets that are more likely than not to be realized, primarily as a result of actual and projected increases in U.S. profitability in the current and future periods. In performing its analysis, the Company used the most updated plans and estimates that it currently uses to manage the underlying business and calculated the ability to utilize its deferred tax assets. The valuation allowance increased by $0.7 million from 2021 to 2022. The Company continues to maintain a valuation allowance of $29.9 million on certain U.S. federal and state deferred tax assets that the Company believes are not more likely than not to be realized in future periods. As of December 31, 2022, the Company had U.S. federal and state net operating losses of approximately $205.2 million and $24.0 million, respectively. The U.S. federal net operating loss carryforwards will expire at various dates through 2039 if not utilized. The state net operating loss carryforwards will expire at various dates through 2039 if not utilized. Additionally, the Company has U.S. federal, California and other U.S. states research and development credits of approximately $40.7 million, $47.0 million and $2.7 million as of December 31, 2022, respectively. The U.S. federal research and development credits have begun to expire in 2022 and will continue to expire at various dates through 2042. The California research and development credits have no expiration date. The credits related to other various U.S. states have begun to expire and will continue to expire at various dates through 2036. Uncertain Tax Positions ASC 740, “Income Taxes,” prescribes a recognition threshold and measurement attribute to the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The guidance also provides guidance on derecognition, classification, accounting in interim periods and disclosure requirements for uncertain tax positions. The standard requires the Company to recognize the financial statement effects of an uncertain tax position when it is more likely than not that such position will be sustained upon audit. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as interest expense and income tax expense, respectively, in its Consolidated Statements of Comprehensive Income. The following table reconciles the Company’s unrecognized tax benefits (in thousands): Years Ended December 31, 2022 2021 Balance at beginning of year $ 25,992 $ 23,516 Reduction for tax positions related to prior year (905) (1,427) Additions for tax positions related to prior year 1,232 1,947 Additions for tax positions related to current year 2,896 1,956 Balance at end of year $ 29,215 $ 25,992 As of December 31, 2022 and 2021, the Company had unrecognized tax benefits of $29.2 million and $26.0 million, respectively, $15.3 million of which would affect the Company’s effective tax rate if recognized. There were no accrued interest or penalties for uncertain income tax as of December 31, 2022. The Company files tax returns in the United States and various state jurisdictions, China, India and the United Kingdom. The tax years 2000 through 2021 remain open and subject to examination by the appropriate governmental agencies due to tax attribute carryforwards.

Net Income Per Common Share

Net Income Per Common Share	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Net Income Per Common Share	Net Income Per Common Share The following table sets forth the computation of basic and diluted net income per common share for the periods indicated (in thousands, except per share data): Years Ended December 31, 2022 2021 2020 Numerator: Net income $ 41,010 $ 238,378 $ 33,484 Denominator: Weighted-average common shares — basic 65,058 63,277 59,074 Effect of dilutive potential common shares 3,853 4,579 2,924 Weighted-average common shares — diluted 68,911 67,856 61,998 Basic net income per common share $ 0.63 $ 3.77 $ 0.57 Diluted net income per common share $ 0.60 $ 3.51 $ 0.54 Potentially dilutive shares excluded, weighted-average 1,758 1,006 753 Unvested restricted stock awards are included in the calculation of basic weighted-average shares because such shares are participating securities; however, the impact was immaterial. Potentially dilutive shares have been excluded from the computation of diluted net income per common share when their effect is antidilutive. These antidilutive shares were primarily from stock options.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with CustomersThe Company develops, markets and sells a broadband platform and managed services, and there are no segment managers who are held accountable for operations, operating results and plans for levels or components below the Company unit level. Accordingly, the Company is considered to be in a single reporting segment and operating unit structure. The Company’s chief operating decision maker is the Company’s Chief Executive Officer, who reviews financial information presented on a Company-wide basis, for purposes of allocating resources and evaluating financial performance. Geographic Information: The following is a summary of revenue disaggregated by geographic region based upon the location of the customers (in thousands): Years Ended December 31, 2022 2021 2020 United States $ 786,802 $ 565,964 $ 473,779 Americas excluding U.S. 41,892 45,719 27,802 Europe 26,916 45,879 22,925 Middle East & Africa 10,885 19,018 14,075 Asia Pacific 1,332 2,814 2,658 $ 867,827 $ 679,394 $ 541,239 The Company’s property and equipment, net of accumulated depreciation, are located in the following geographical areas (in thousands): December 31, 2022 2021 United States $ 21,785 $ 19,900 China 3,220 1,840 India 829 43 $ 25,834 $ 21,783 Contract Asset The primary contract asset is revenue recognized on professional services contracts where the services are transferred to the customer over time, which has yet to be billed, and is classified to remaining performance obligations within accounts receivable. Amounts are billed in accordance with the agreed-upon contractual terms. The balance as of December 31, 2022 was $2.3 million of which the Company expects to bill 81% of the balance during 2023. The balance as of December 31, 2021 was $1.7 million of which $0.3 million remained in the Company's Consolidated Balance Sheet at December 31, 2022. The increase in the contract asset was driven by the timing and volume of professional services contracts. Contract Liability Deferred revenue was $58.6 million and $49.5 million as of December 31, 2022 and 2021, respectively. The increase in deferred revenue of $9.1 million is primarily driven by cash payments received or due in advance of satisfying the Company's performance obligations during the year being greater than the $26.8 million of revenue recognized that was included in the deferred revenue balance at the beginning of the year. Revenue allocated to remaining performance obligations represent contract revenue that has not yet been recognized, which includes deferred revenue and amounts that will be invoiced and recognized as revenue in future periods. This amount was $199.0 million as of December 31, 2022, and the Company expects to recognize 35% of such revenue over the next 12 months and the remainder thereafter. Contract Costs The Company capitalizes certain sales commissions related primarily to multi-year subscriptions and extended warranty support for which the expected amortization period is greater than one year. As of December 31, 2022 and 2021, the unamortized balance of deferred commissions was $11.2 million and $7.4 million, respectively. For the year ended December 31, 2022 the amount of amortization was $4.0 million, compared to $1.4 million for the year ended December 31, 2021. There was no impairment loss in relation to the costs capitalized for either period. Concentration of Customer Risk No customer accounted for more than 10% of the Company’s revenue for the years ended December 31, 2022 and 2021. Lumen Technologies, Inc. (formerly CenturyLink, Inc.), the Company’s only greater-than-10%-of-revenue customer, represented 11% of revenue for the year ended December 31, 2020. One customer represented 11% of the Company’s accounts receivable as of December 31, 2022. Another customer represented 12% of the Company’s accounts receivable as of December 31, 2021.

Description of Business and S_2

Description of Business and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Basis of Presentation and Accounting Guidance	Basis of Presentation and Accounting Guidance The accompanying consolidated financial statements have been prepared in accordance with the requirements of the U.S. Securities and Exchange Commission (“SEC”) and U.S. generally accepted accounting principles (“GAAP”). All significant intercompany balances and transactions have been eliminated in consolidation. Any reference in these notes to applicable accounting guidance is meant to refer to the authoritative U.S. GAAP as found in the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”).
Use of Estimates	Use of Estimates The preparation of financial statements is in conformity with U.S. GAAP, which requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. For the Company, these estimates include, but are not limited to: allowances for doubtful accounts and sales returns, excess and obsolete inventory, allowances for obligations to its contract manufacturers, valuation of stock-based compensation, useful lives assigned to long-lived assets, standard and extended warranty costs, realizability of deferred tax assets and uncertain tax positions and contingencies. Actual results could differ from those estimates, and such differences could be material to the Company’s financial position and results of operations.
Revenue Recognition, Contract Costs, and Deferred Revenue	Revenue Recognition Revenue is recognized when a performance obligation is satisfied, which occurs when control of the promised goods or services is transferred to the customer, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. Revenue from sales of access and premises systems is recognized when control is transferred to the customer, which is generally when the products are shipped. Revenue from software platform licenses, which provides the customer with a right to use the software as it exists, is generally recognized upfront when made available to the customer. Revenue from cloud-based software subscriptions, customer support, maintenance, extended warranty subscriptions and managed services is generally recognized ratably over the contract term. Revenue from professional services and training is recognized as the services are delivered. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer and is the unit of account. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The Company’s hardware products contain both software and non-software components that function together to deliver the products’ essential functionality and therefore constitutes a single performance obligation as the promise to transfer the individual software and non-software components is not separately identifiable and, therefore, not distinct. Cloud-based software subscriptions can include multi-year agreements with a fixed annual fee for a minimum committed usage level. To the extent that minimum committed usage level each year varies, the Company has concluded that each year represents a distinct stand-ready performance obligation and the transaction price allocated to each performance obligation is recognized as revenue ratably over each annual period. The Company’s contracts may include multiple performance obligations. For such arrangements, the Company allocates the contract’s transaction price to each performance obligation using the relative stand-alone selling price of each distinct good or service in the contract. The Company generally determines stand-alone selling prices based on the prices charged to customers or its best estimate of stand-alone selling price. The Company’s estimate of stand-alone selling price is established considering multiple factors including, but not limited to, geographies, market conditions, competitive landscape, internal costs, gross margin objectives, characteristics of targeted customers and pricing practices. The determination of estimated stand-alone selling price is made through consultation with and formal approval by management, taking into consideration the go-to-market strategy. Contract Costs The Company capitalizes certain sales commissions related primarily to multi-year cloud-based software subscriptions and extended warranty support contracts. Capitalized commissions are amortized as sales and marketing expenses over the period that the related revenue is recognized, which can be up to five years for extended warranty. The Company classifies the unamortized portion of deferred commissions as current or noncurrent based on the timing of when the Company expects to recognize the expense. The current and noncurrent portions of deferred commissions are included in “Prepaid expenses and other current assets” and “Other assets,” respectively, in the Company’s Consolidated Balance Sheets. Deferred Revenue Deferred revenue results from transactions where the Company billed the customer for products or services and when cash payments are received or due prior to transferring control of the promised goods or services to the customer. Payment terms to customers typically range from net 30 to net 90 days and vary by the size and location of customer and the products or services offered. The period between the transfer of control of the promised good or service to a customer and when payment is due is not significant.
Cost of Revenue	Cost of Revenue Cost of revenue consists primarily of finished goods inventory purchased from the Company’s contract manufacturers, payroll and related expenses associated with managing the relationships with contract manufacturers, depreciation of manufacturing test equipment, warranty and retrofit costs, excess and obsolete inventory costs, allowances for obligations to its contract manufacturers, shipping charges and amortization of certain intangible assets. It also includes contractor and other costs of services incurred directly related to the delivery of services to customers.
Warranty and Retrofit	Warranty and Retrofit The Company offers limited warranties for its hardware products for a period of one three
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation expense associated with stock options and purchase rights under the Amended and Restated Employee Stock Purchase Plan (the “ESPP”) and the Amended and Restated 2017 Nonqualified Employee Stock Purchase Plan (the “NQ ESPP”) is measured at the grant date based on the fair value of the award and is recognized, net of forfeitures, as expense over the remaining requisite service period (generally the vesting period) on a straight-line basis. The fair value of stock option and employee stock purchase right under the ESPP is estimated at the grant date using the Black-Scholes option valuation model. The fair value of the employee stock purchase right under the NQ ESPP is based on closing market price of the Company’s common stock on the date of grant. Stock-based compensation expense associated with performance stock options (“PSOs”) with graded vesting features and which contain both a performance and a service condition is measured based on fair value of stock options estimated at the grant date using the Black-Scholes option valuation model, and is recognized, net of forfeitures, as expense over the requisite service period using the graded vesting attribution method. Compensation expense is only recognized if the Company has determined that it is probable that the performance condition will be met. The Company reassesses the probability of vesting at each reporting period and adjusts compensation expense based on its probability assessment.
Loss Contingencies	Loss Contingencies From time to time, the Company is involved in legal proceedings arising from the normal course of business activities. The Company evaluates the likelihood of an unfavorable outcome of legal proceedings to which it is a party and accrues a loss contingency when the loss is probable and reasonably estimable. Assessing legal contingencies involves significant judgment and estimates, and the outcome of litigation is inherently uncertain and subject to numerous factors outside the Company’s control. Significant judgment is required when the Company assesses the likelihood of any adverse judgments or outcomes, including the potential range of possible losses, and whether losses are probable and reasonably estimable. Because of uncertainties related to these matters, the Company bases its estimates of whether a loss contingency is probable or reasonably possible, as well as the reasonable range of possible losses associated with each loss contingency, only on the information available at the time. As additional information becomes available, and at least quarterly, the Company reassesses the potential liability on each significant matter and may revise its estimates. These revisions could have a material impact on the Company’s business, operating results or financial condition. The actual outcome of these legal proceedings may materially differ from the Company’s estimates of potential liability, which could have a material adverse effect on the Company’s business, operating results or financial condition.
Credit Risk and Inventory Supplier Concentrations	Credit Risk and Inventory Supplier Concentrations Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash, cash equivalents, marketable securities and accounts receivable. Cash equivalents consist of money market funds and marketable securities with a maturity at the date of purchase of ninety days or less, which are invested through financial institutions in the United States. Deposits in and investments held by these financial institutions may, at times, exceed federally insured limits. The Company has not experienced any losses in such accounts. The Company also has approximately $2.7 million of cash held by its foreign subsidiaries in India, China and the United Kingdom. Management believes that the financial institutions that hold the Company’s cash and cash equivalents are financially sound and, accordingly, minimal credit risk exists with respect to these cash and cash equivalents. The Company depends primarily on a small number of outside contract manufacturers (“CMs”) and original design manufacturers (“ODMs”) for the bulk of its finished goods inventory. The Company generally purchases its products through purchase orders with its suppliers. While the Company seeks to maintain a sufficient supply of its products, the Company’s business and results of operations could be adversely affected by a stoppage or delay in receiving such products, the receipt of defective parts, an increase in price of such products or the Company’s inability to obtain lower prices from its CMs, ODMs and other suppliers in response to competitive pressures.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The carrying amounts of cash and cash equivalents, trade receivables, accounts payable and other accrued liabilities approximate their fair value due to their relatively short-term nature. Marketable securities are valued using quoted market prices in active markets to determine fair value.
Cash, Cash Equivalents, and Marketable Securities	Cash, Cash Equivalents and Marketable Securities Cash equivalents and marketable securities are stated at amounts that approximate fair value based on quoted market prices. The Company has invested its excess cash primarily in money market funds and highly liquid marketable securities such as U.S. treasury securities, corporate debt instruments, commercial paper and U.S. government securities. The Company considers all investments with maturities of three months or less when purchased to be cash equivalents. Marketable securities represent highly liquid U.S. treasury securities, corporate debt instruments, commercial paper and U.S. government securities with maturities greater than 90 days at date of purchase. Marketable securities with maturities greater than one year are classified as current because management considers all marketable securities to be available for current operations. The Company’s investments have been classified and accounted for as available-for-sale. Such investments are recorded at fair value and unrealized holding gains and losses are reported as a separate component of comprehensive loss in the stockholders’ equity until realized. Realized gains and losses on sales of marketable securities, if any, are determined on the specific identification method and are reclassified from accumulated other comprehensive loss to results of operations as “Other income (expense), net.” Realized gains and losses were not significant for the years ended December 31, 2022 and 2021, respectively. For the Company’s available-for-sale debt securities in an unrealized loss position, the Company determines whether a credit loss exists. In this assessment, among other factors, the Company considers the extent to which the fair value is less than the amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security. If factors indicate a credit loss exists, an allowance for credit loss will be recorded to “Other income (expense), net,” limited by the amount that the fair value is less than the amortized cost basis. The amount of fair value change relating to all other factors will be recognized in other comprehensive loss.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts The Company maintains an allowance for doubtful accounts for expected credit losses at contract inception resulting from the inability of its customers to make required payments. The Company records a specific allowance and revises the expected loss based on an analysis of individual past-due balances. Additionally, based on historical write-offs and the Company’s collection experience, the Company records an additional allowance based on a percentage of outstanding receivables. The Company performs credit evaluations of its customers’ financial condition. These evaluations require judgment and are based on a variety of factors including, but not limited to, current economic trends, payment history and a financial review of the customer. Actual collection losses may differ from management’s estimates, and such differences could be material to the Company's financial position and results of operations.
Inventory Valuation and Supplier Purchase Commitments	Inventory Valuation and Supplier Purchase Commitments Inventory, which primarily consists of finished goods purchased from CMs or ODMs, is stated at the lower of cost (determined by the first-in, first-out method) or market value. Inbound shipping costs and U.S. tariffs are included in cost of inventory. In addition, from time to time, the Company procures component inventory primarily as a result of manufacturing discontinuation of critical components by suppliers. The Company regularly monitors inventory quantities on hand and records write-downs for excess and obsolete inventories based on the Company’s estimate of demand for its products, potential obsolescence of technology, product life cycles and whether pricing trends or forecasts indicate that the carrying value of inventory exceeds its estimated selling price. The Company also evaluates its supplier purchase commitments, which have increased significantly due to extended lead-times in the current supply chain environment, and records a liability for excess and obsolete components based on its estimated demand of our products, potential obsolescence of technology and product life cycles. These factors are impacted by market and economic conditions, technology changes and new product introductions and require significant estimates that may include elements that are uncertain. Actual demand may differ from forecasted demand and may have a material effect on gross profit. If inventory is written down, a new cost basis is established that cannot be increased in future periods. Shipments from suppliers before the Company receives them are recorded as in-transit inventory when title and the significant risks and rewards of ownership have passed to the Company.
Property and Equipment	Property and Equipment Property and equipment are stated at cost, less accumulated depreciation, and are depreciated using the straight-line method over the estimated useful life of each asset. Generally, computer equipment is depreciated over two years; purchased software is depreciated over three
Goodwill	Goodwill Goodwill was recorded as a result of the Company’s acquisitions of Occam Networks, Inc. in February 2011 and Optical Solutions, Inc. in February 2006. The Company records goodwill when consideration paid in a business acquisition exceeds the fair value of the net tangible assets and the identified intangible assets acquired. Goodwill is not amortized but instead is subject to an annual impairment test or more frequently if events or changes in circumstances indicate that it may be impaired. The Company evaluates goodwill on an annual basis as of the end of the second quarter of each fiscal year. Management has determined that it operates as a single reporting unit and, therefore, evaluates goodwill impairment at the enterprise level. At the end of the second quarter of 2022, the Company completed its annual goodwill impairment test. Based on its assessment of certain qualitative factors such as market capitalization, management concluded that the fair value of the Company was more likely than not greater than its carrying amount as of July 2, 2022. As such, it was not necessary to perform the two-step quantitative goodwill impairment test at the time.
Income Taxes	Income Taxes The Company evaluates its tax positions and estimates its current tax exposure along with assessing temporary differences that result from different book to tax treatment of items not currently deductible for tax purposes. These differences result in deferred tax assets and liabilities on the Company’s Consolidated Balance Sheets, which are estimated based upon the
Newly Adopted Accounting Standards and Recent Accounting Pronouncements Not Yet Adopted	Newly Adopted Accounting Standards The Company did not adopt any new accounting standards in 2022 that were significant to the Company. Recent Accounting Pronouncements Not Yet Adopted There have been no accounting pronouncements or changes in accounting pronouncements that are significant or potentially significant to the Company.

Cash, Cash Equivalents and Ma_2

Cash, Cash Equivalents and Marketable Securities (Tables)	12 Months Ended
	Dec. 31, 2022
Cash and Cash Equivalents [Abstract]
Summary of Cash and Cash Equivalents	Cash, cash equivalents and marketable securities consisted of the following (in thousands): December 31, 2022 2021 Cash and cash equivalents: Cash $ 39,189 $ 26,442 Commercial paper 33,199 21,582 U.S. government securities 5,990 — Money market funds 555 2,320 Corporate debt securities 140 989 Total cash and cash equivalents 79,073 51,333 Marketable securities: U.S. government securities 106,750 60,279 Commercial paper 28,992 80,812 U.S. government agency securities 23,632 5,527 Corporate debt securities 3,168 3,576 Municipal securities 100 2,808 Total marketable securities 162,642 153,002 $ 241,715 $ 204,335
Debt Securities, Available-for-Sale	The amortized cost and fair value of marketable securities as of December 31, 2022 were as follows (in thousands): Amortized Cost Gross Unrealized Losses Fair Value U.S. government securities $ 114,119 $ (1,379) $ 112,740 Commercial paper 62,262 (71) 62,191 U.S. government agency securities 23,876 (244) 23,632 Corporate debt securities 3,312 (4) 3,308 Municipal securities 101 (1) 100 Total marketable securities $ 203,670 $ (1,699) $ 201,971

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis	The following tables sets forth the Company’s financial assets measured at fair value on a recurring basis based on the three-tier fair value hierarchy (in thousands): As of December 31, 2022 Level 1 Level 2 Total Money market funds $ 555 $ — $ 555 U.S. government securities 112,740 — 112,740 Commercial paper — 62,191 62,191 U.S. government agency securities — 23,632 23,632 Corporate debt securities — 3,308 3,308 Municipal securities — 100 100 $ 113,295 $ 89,231 $ 202,526 As of December 31, 2021 Level 1 Level 2 Total Money market funds $ 2,320 $ — $ 2,320 U.S. government securities 60,279 — 60,279 Commercial paper — 102,394 102,394 U.S. government agency securities — 5,527 5,527 Corporate debt securities — 4,565 4,565 Municipal securities — 2,808 2,808 $ 62,599 $ 115,294 $ 177,893

Balance Sheet Details (Tables)

Balance Sheet Details (Tables)	12 Months Ended
	Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract]
Accounts Receivable, net	Accounts receivable, net consisted of the following (in thousands): December 31, 2022 2021 Accounts receivable $ 94,201 $ 85,944 Allowance for doubtful accounts (397) (725) $ 93,804 $ 85,219
Changes in Allowance for Doubtful Accounts and Product Reserve	The table below summarizes the changes in allowance for doubtful accounts and product return liability for the periods indicated (in thousands): Balance at Beginning of Year Additions Charged to Expenses or Revenue Net of Recoveries Write Offs and Returns Balance at Year Ended December 31, 2022: Allowance for doubtful accounts $ 725 $ (276) $ (52) $ 397 Product return liability 1,836 5,622 (4,497) 2,961 Year Ended December 31, 2021: Allowance for doubtful accounts $ 1,405 $ (201) $ (479) $ 725 Product return liability 1,888 3,681 (3,733) 1,836 Year Ended December 31, 2020: Allowance for doubtful accounts $ 374 $ 1,085 $ (54) $ 1,405 Product return liability 919 3,391 (2,422) 1,888
Inventory	Inventory consisted of the following (in thousands): December 31, 2022 2021 Raw materials $ 640 $ 130 Finished goods 148,520 88,750 $ 149,160 $ 88,880
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure	Prepaid expenses and other current assets consisted of the following (in thousands): December 31, 2022 2021 Supplier deposits $ 39,064 $ 6,191 Prepaid expenses and other current assets 23,627 24,620 $ 62,691 $ 30,811
Property and Equipment, net	Property and equipment, net consisted of the following (in thousands): December 31, 2022 2021 Test equipment $ 44,106 $ 39,476 Computer equipment 13,396 11,156 Software 10,389 9,013 Leasehold improvements 1,730 1,351 Furniture and fixtures 1,153 1,812 70,774 62,808 Accumulated depreciation and amortization (44,940) (41,025) $ 25,834 $ 21,783
Schedule of Other Assets, Noncurrent	Other long-term assets consisted of the following (in thousands): December 31, 2022 2021 Intangible asset $ 4,253 $ 6,885 Other long-term assets 14,889 6,800 $ 19,142 $ 13,685
Accrued Liabilities	Accrued liabilities December 31, 2022 2021 Compensation and related benefits $ 27,813 $ 23,165 Component inventory held by suppliers 10,280 7,611 Professional and consulting fees 7,307 4,819 Current portion of revenue-share payments 7,210 4,731 Current portion of warranty and retrofit 6,377 7,076 Customer advances or rebates 5,653 4,742 Taxes payable 4,581 4,251 Operating leases 3,949 3,596 Freight 3,649 3,997 Business events 3,167 — Product returns 2,961 1,836 Other 7,527 5,773 $ 90,474 $ 71,597
Schedule of Product Warranty Liability	Changes in the Company’s accrued warranty and retrofit liability were as follows (in thousands): Years Ended December 31, 2022 2021 2020 Balance at beginning of year $ 9,594 $ 9,208 $ 7,294 Provision for warranty and retrofit charged to cost of revenue 1,315 3,370 5,888 Utilization of reserve (2,523) (2,984) (3,974) Balance at end of year $ 8,386 $ 9,594 $ 9,208

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Lessee, Operating Lease, Liability, Maturity	Future minimum payments under the non-cancelable operating leases consisted of the following as of December 31, 2022 (in thousands): Year Ending December 31, Future Minimum Lease Payments 2023 $ 4,629 2024 4,458 2025 3,955 2026 and thereafter 531 Total future minimum lease payments 13,573 Less imputed interest (1,182) $ 12,391
Lessee, Operating Leases	As of December 31, 2022, the operating lease liability consisted of the following (in thousands): Accrued liabilities - current portion of operating leases $ 3,949 Operating leases 8,442 $ 12,391
Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity	Future minimum payments consisted of the following as of December 31, 2022 (in thousands): Year Ending December 31, Future Minimum Sublease Payments 2023 750 2024 773 2025 661 Total future minimum sublease payments $ 2,184

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Schedule of Stock Options Activity	The following table summarizes the stock option activity under the Company’s equity incentive plans (in thousands, except per share data): Weighted- Average Weighted- Remaining Average Contractual Aggregate Number of Exercise Price Life Intrinsic Stock Options Shares Per Share (in years) Value (1) Outstanding as of December 31, 2021 6,648 $ 17.46 Granted 2,423 56.04 Exercised (721) 9.28 Canceled (63) 35.74 Outstanding as of December 31, 2022 8,287 $ 29.31 7.5 $ 325,828 Vested and expected to vest as of December 31, 2022 8,028 $ 28.64 7.4 $ 321,015 Options exercisable as of December 31, 2022 4,010 $ 14.04 6.1 $ 218,143 (1) Amounts represent the difference between the exercise price and the fair market value of common stock at December 31, 2022 of $68.43 per share for all “in-the-money” options outstanding.
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award	The following table summarizes stock-based compensation expense (in thousands): Years Ended December 31, 2022 2021 2020 Cost of revenue: Products $ 1,666 $ 790 $ 575 Services 1,034 668 450 Sales and marketing 12,001 6,728 4,273 Research and development 12,165 6,769 4,736 General and administrative 17,960 9,275 3,926 $ 44,826 $ 24,230 $ 13,960 Income tax benefits recognized $ 11,501 $ 16,929 $ —
Schedule of Grant Date Fair Values	The following table summarizes the weighted-average grant date fair values of the Company’s stock-based awards granted in the periods indicated: Years Ended December 31, 2022 2021 2020 Stock options $ 31.86 $ 26.55 $ 8.55 ESPP $ 18.51 $ 12.93 $ 5.52 NQ ESPP $ 52.91 $ 55.50 $ 19.40
Valuation Assumptions, Stock Options	The following table summarizes the weighted-average assumptions used in estimating the grant-date fair value of stock options and of each employee’s purchase right under the ESPP in the periods indicated: Years Ended December 31, Stock Options 2022 2021 2020 Expected volatility 58 % 56 % 53 % Expected life (years) 6.1 6.0 6.1 Risk-free interest rate 3.15 % 1.11 % 0.48 %
Valuation Assumptions, ESPP	Years Ended December 31, ESPP 2022 2021 2020 Expected volatility 62 % 63 % 70 % Expected life (years) 0.5 0.5 0.4 Risk-free interest rate 2.16 % 0.05 % 0.12 %
Schedule of Unrecognized Compensation Cost	As of December 31, 2022, unrecognized stock-based compensation expense by award type, net of estimated forfeitures, and their expected weighted-average recognition periods are summarized in the following table (in thousands). Stock Option ESPPs Unrecognized stock-based compensation expense $ 73,095 $ 9,781 Weighted-average amortization period (in years) 2.3 0.8
Shares Reserved For Future Issuance	Shares Reserved for Future Issuance As of December 31, 2022, the Company had common shares reserved for future issuance as follows (in thousands): Stock options outstanding 8,287 Shares available for future grant under 2019 Plan 5,986 Shares available for future issuance under ESPP 4,712 Shares available for future issuance under NQ ESPP 3,043 22,028

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The table below summarizes the changes in accumulated other comprehensive loss by component: Unrealized Gains and Losses on Available-for-Sale Marketable Securities Foreign Currency Translation Adjustments Total Balance as of December 31, 2020 $ — $ (191) $ (191) Other comprehensive income (loss) (179) 50 (129) Balance as of December 31, 2021 (179) (141) (320) Other comprehensive loss (1,521) (632) (2,153) Balance as of December 31, 2022 $ (1,700) $ (773) $ (2,473)

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign	The domestic and foreign components of income before incomes taxes were as follows (in thousands): Years Ended December 31, 2022 2021 2020 Domestic $ 51,442 $ 70,776 $ 33,777 Foreign 2,600 1,878 507 $ 54,042 $ 72,654 $ 34,284
Schedule of Components of Income Tax Expense (Benefit)	Income taxes consisted of the following (in thousands): Years Ended December 31, 2022 2021 2020 Current: Federal $ 3,671 $ — $ — State 6,555 2,818 285 Foreign 874 438 507 Current income tax 11,100 3,256 792 Deferred: Federal 6,336 (157,355) — State (4,372) (11,631) — Foreign (32) 6 8 Deferred income tax 1,932 (168,980) 8 $ 13,032 $ (165,724) $ 800
Schedule of Effective Income Tax Rate Reconciliation	The differences between the statutory and effective tax rates, expressed as a percentage of net income before income taxes, were as follows: Years Ended December 31, 2022 2021 2020 Federal statutory rate 21.0 % 21.0 % 21.0 % Impact of state taxes 1.4 (15.6) 0.1 Foreign operations — (0.2) 0.6 R&D tax credits (7.4) 1.4 (4.8) Foreign income inclusion 1.0 — — Stock-based compensation — (12.8) (4.1) Other permanent items (0.2) (0.3) 0.6 Tax true-up — (0.2) (0.4) Valuation allowance (4.0) (208.3) (48.1) Net operating loss expiration / attribute expiration 5.5 (13.1) 37.4 Base erosion anti-abuse tax 6.8 — — 24.1 % (228.1) % 2.3 %
Schedule of Deferred Tax Assets and Liabilities	The significant components of the Company’s deferred tax assets were as follows (in thousands): December 31, 2022 2021 Deferred tax assets: Net operating loss carryforwards $ 44,189 $ 82,672 Tax credit carryforwards 56,717 52,538 Accruals and reserves 11,679 10,302 Deferred revenue 13,156 11,351 Stock-based compensation 7,417 4,921 Capitalized R&D 67,932 38,842 Gross deferred tax assets 201,090 200,626 Valuation allowance (29,914) (29,236) Total deferred tax assets 171,176 171,390 Deferred tax liabilities: Fixed assets (2,648) (1,511) Intangible assets (1,497) (917) Total deferred tax liabilities (4,145) (2,428) $ 167,031 $ 168,962
Unrecognized Tax Benefits Activity	The following table reconciles the Company’s unrecognized tax benefits (in thousands): Years Ended December 31, 2022 2021 Balance at beginning of year $ 25,992 $ 23,516 Reduction for tax positions related to prior year (905) (1,427) Additions for tax positions related to prior year 1,232 1,947 Additions for tax positions related to current year 2,896 1,956 Balance at end of year $ 29,215 $ 25,992

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Schedule of Net Loss Per Share	The following table sets forth the computation of basic and diluted net income per common share for the periods indicated (in thousands, except per share data): Years Ended December 31, 2022 2021 2020 Numerator: Net income $ 41,010 $ 238,378 $ 33,484 Denominator: Weighted-average common shares — basic 65,058 63,277 59,074 Effect of dilutive potential common shares 3,853 4,579 2,924 Weighted-average common shares — diluted 68,911 67,856 61,998 Basic net income per common share $ 0.63 $ 3.77 $ 0.57 Diluted net income per common share $ 0.60 $ 3.51 $ 0.54 Potentially dilutive shares excluded, weighted-average 1,758 1,006 753

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue by Geographic Region	The following is a summary of revenue disaggregated by geographic region based upon the location of the customers (in thousands): Years Ended December 31, 2022 2021 2020 United States $ 786,802 $ 565,964 $ 473,779 Americas excluding U.S. 41,892 45,719 27,802 Europe 26,916 45,879 22,925 Middle East & Africa 10,885 19,018 14,075 Asia Pacific 1,332 2,814 2,658 $ 867,827 $ 679,394 $ 541,239
Property and Equipment by Geographic Region	The Company’s property and equipment, net of accumulated depreciation, are located in the following geographical areas (in thousands): December 31, 2022 2021 United States $ 21,785 $ 19,900 China 3,220 1,840 India 829 43 $ 25,834 $ 21,783

Description of Business and S_3

Description of Business and Significant Accounting Policies - Contract Costs (Details)	Dec. 31, 2022
Accounting Policies [Abstract]
Capitalized contract cost, amortization period	5 years

Description of Business and S_4

Description of Business and Significant Accounting Policies - Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2022
Computer equipment
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	2 years
Purchased Software | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	3 years
Purchased Software | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	5 years
Test Equipment
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	3 years
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	7 years

Description of Business and S_5

Description of Business and Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Oct. 02, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Certain Terms [Line Items]
Product warranty period		3 years
Goodwill, impairment loss		$ 0	$ 0	$ 0
Change in deferred tax assets valuation allowance, amount	$ 162,000,000
Valuation allowance		29,914,000	$ 29,236,000
Subsidiaries | Brazil, China And United Kingdom
Schedule of Certain Terms [Line Items]
Cash		$ 2,700,000
Minimum
Schedule of Certain Terms [Line Items]
Product warranty period		1 year
Maximum
Schedule of Certain Terms [Line Items]
Product warranty period		5 years

Cash, Cash Equivalents and Ma_3

Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 79,073	$ 51,333
Marketable securities	162,642	153,002
Total cash, cash equivalents, and marketable securities	$ 241,715	204,335
Maximum
Cash and Cash Equivalents [Line Items]
Marketable securities, term	2 years
U.S. government securities
Cash and Cash Equivalents [Line Items]
Marketable securities	$ 106,750	60,279
Commercial paper
Cash and Cash Equivalents [Line Items]
Marketable securities	28,992	80,812
U.S. government agency securities
Cash and Cash Equivalents [Line Items]
Marketable securities	23,632	5,527
Corporate debt securities
Cash and Cash Equivalents [Line Items]
Marketable securities	3,168	3,576
Municipal securities
Cash and Cash Equivalents [Line Items]
Marketable securities	100	2,808
Cash
Cash and Cash Equivalents [Line Items]
Cash	39,189	26,442
Commercial paper
Cash and Cash Equivalents [Line Items]
Cash equivalents	33,199	21,582
U.S. government securities
Cash and Cash Equivalents [Line Items]
Cash equivalents	5,990	0
Money market funds
Cash and Cash Equivalents [Line Items]
Cash equivalents	555	2,320
Corporate debt securities
Cash and Cash Equivalents [Line Items]
Cash equivalents	$ 140	$ 989

Cash, Cash Equivalents, and Mar

Cash, Cash Equivalents, and Marketable Securities - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Marketable securities	$ 162,642	$ 153,002
Short-Term Marketable Securities And Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	203,670
Gross Unrealized Losses	(1,699)
Marketable securities	201,971
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities	106,750	60,279
U.S. government securities | Short-Term Marketable Securities And Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	114,119
Gross Unrealized Losses	(1,379)
Marketable securities	112,740
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Marketable securities	28,992	80,812
Commercial paper | Short-Term Marketable Securities And Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	62,262
Gross Unrealized Losses	(71)
Marketable securities	62,191
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities	23,632	5,527
U.S. government agency securities | Short-Term Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,876
Gross Unrealized Losses	(244)
Marketable securities	23,632
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities	3,168	3,576
Corporate debt securities | Short-Term Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,312
Gross Unrealized Losses	(4)
Marketable securities	3,308
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities	100	$ 2,808
Municipal securities | Short-Term Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	101
Gross Unrealized Losses	(1)
Marketable securities	$ 100

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 162,642	$ 153,002
U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	106,750	60,279
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	28,992	80,812
U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	23,632	5,527
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	3,168	3,576
Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	100	2,808
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	555	2,320
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	202,526	177,893
Fair Value, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	113,295	62,599
Fair Value, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	89,231	115,294
Fair Value, Recurring | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	112,740	60,279
Fair Value, Recurring | U.S. government securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	112,740	60,279
Fair Value, Recurring | U.S. government securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Recurring | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	62,191	102,394
Fair Value, Recurring | Commercial paper | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Recurring | Commercial paper | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	62,191	102,394
Fair Value, Recurring | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	23,632	5,527
Fair Value, Recurring | U.S. government agency securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Recurring | U.S. government agency securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	23,632	5,527
Fair Value, Recurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	3,308	4,565
Fair Value, Recurring | Corporate debt securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Recurring | Corporate debt securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	3,308	4,565
Fair Value, Recurring | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	100	2,808
Fair Value, Recurring | Municipal securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Recurring | Municipal securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	100	2,808
Fair Value, Recurring | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	555	2,320
Fair Value, Recurring | Money market funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	555	2,320
Fair Value, Recurring | Money market funds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 0	$ 0

Balance Sheet Details - Account

Balance Sheet Details - Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Summary of accounts receivable, net
Accounts receivable	$ 94,201	$ 85,944
Allowance for doubtful accounts	(397)	(725)
Accounts receivable, net	$ 93,804	$ 85,219

Balance Sheet Details - Allowan

Balance Sheet Details - Allowance and Product Return Reserve (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 725	$ 1,405	$ 374
Additions Charged to Expenses or Revenue Net of Recoveries	(276)	(201)	1,085
Write Offs and Returns	(52)	(479)	(54)
Balance at End of Year	397	725	1,405
Product return liability
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	1,836	1,888	919
Additions Charged to Expenses or Revenue Net of Recoveries	5,622	3,681	3,391
Write Offs and Returns	(4,497)	(3,733)	(2,422)
Balance at End of Year	$ 2,961	$ 1,836	$ 1,888

Balance Sheet Details - Invento

Balance Sheet Details - Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Summary of inventory, net
Raw materials	$ 640	$ 130
Finished goods	148,520	88,750
Total inventory	$ 149,160	$ 88,880

Balance Sheet Details - Schedul

Balance Sheet Details - Schedule of Prepaid and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Text Block [Abstract]
Supplier deposits	$ 39,064	$ 6,191
Prepaid expenses and other current assets	23,627	24,620
Prepaid expenses and other current assets	$ 62,691	$ 30,811

Balance Sheet Details - Propert

Balance Sheet Details - Property and Equipment, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 70,774	$ 62,808
Accumulated depreciation and amortization	(44,940)	(41,025)
Property and equipment, net	25,834	21,783
Depreciation and amortization	14,315	15,012	$ 13,718
Test equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	44,106	39,476
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,396	11,156
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,389	9,013
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,730	1,351
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,153	$ 1,812

Balance Sheet Details - Intangi

Balance Sheet Details - Intangible Asset Acquisition (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible asset	$ 4,253	$ 6,885
Other long-term assets	14,889	6,800
Other assets	19,142	13,685
Accrued liabilities	90,474	71,597
Other long-term liabilities	6,332	11,076
Licensed Software
Finite-Lived Intangible Assets [Line Items]
Royalty payment commitment amount			$ 15,800
Other liabilities	11,400	13,200
Accrued liabilities	7,200	4,700
Other long-term liabilities	$ 4,200	$ 8,500

Balance Sheet Details - Accrued

Balance Sheet Details - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Operating lease, liability, current, statement of financial position	Total accrued liabilities	Total accrued liabilities
Summary of accrued liabilities
Compensation and related benefits	$ 27,813	$ 23,165
Component inventory held by suppliers	10,280	7,611
Professional and consulting fees	7,307	4,819
Current portion of revenue-share payments	7,210	4,731
Current portion of warranty and retrofit	6,377	7,076
Customer advances or rebates	5,653	4,742
Taxes payable	4,581	4,251
Operating leases	3,949	3,596
Freight	3,649	3,997
Business events	3,167	0
Product returns	2,961	1,836
Other	7,527	5,773
Total accrued liabilities	$ 90,474	$ 71,597

Balance Sheet Details - Product

Balance Sheet Details - Product Warranty Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Product warranty activities [Roll Forward]
Balance at beginning of year	$ 9,594	$ 9,208	$ 7,294
Provision for warranty and retrofit charged to cost of revenue	1,315	3,370	5,888
Utilization of reserve	(2,523)	(2,984)	(3,974)
Balance at end of year	$ 8,386	$ 9,594	$ 9,208

Balance Sheet Details - Restruc

Balance Sheet Details - Restructuring (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges (benefit)		$ 0	$ (786,000)	$ 6,286,000
Restructuring reserve		$ 0
San Jose, California
Restructuring Cost and Reserve [Line Items]
Restructuring charges (benefit)	$ (800,000)
All Platform Future And Work-From-Anywhere Culture Alignment
Restructuring Cost and Reserve [Line Items]
Restructuring charges (benefit)				$ 6,300,000

Commitments and Contingencies -

Commitments and Contingencies - Operating Lease (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2023	$ 4,629
2024	4,458
2025	3,955
2026 and thereafter	531
Total future minimum lease payments	13,573
Less imputed interest	(1,182)
Operating lease, liability	$ 12,391

Commitments and Contingencies_2

Commitments and Contingencies - Sublease (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Nov. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Sublease, term of contract		39 months
2023	$ 750
2024	773
2025	661
Total future minimum sublease payments	$ 2,184

Commitments and Contingencies_3

Commitments and Contingencies - Operating Lease Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Operating lease, liability, current, statement of financial position	Accrued Liabilities, Current	Accrued Liabilities, Current
Accrued liabilities - current portion of operating leases	$ 3,949	$ 3,596
Operating leases	8,442	$ 12,376
Operating lease liability	$ 12,391

Commitments and Contingencies_4

Commitments and Contingencies - Textual (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Total future minimum lease payments	$ 13,573
Operating lease, weighted average discount rate, percent	6.10%
Operating lease, weighted average remaining lease term	3 years
Rent expense	$ 4,600	$ 4,100	$ 4,000
Operating lease, payments	4,500	3,900	$ 3,800
Purchase commitments	340,600	247,300
Accrued professional and consulting fees	10,280	$ 7,611
Sublease Income	300
San Jose, California
Loss Contingencies [Line Items]
Total future minimum lease payments	$ 7,300

Stockholders' Equity - Stock Of

Stockholders' Equity - Stock Offering, Treasury Stock Retirement, Preferred Stock and Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2020	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares authorized (in shares)		5,000,000	5,000,000
Preferred stock, shares issued (in shares)		0	0
Preferred stock, shares outstanding (in shares)		0	0
Dividends declared or paid (in dollars per share)		$ 0
Common stock, par value (in dollars per share)		$ 0.025	$ 0.025
Public Stock Offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares sold in offering (in shares)	3,220,000
Common stock, par value (in dollars per share)	$ 20
Over-Allotment Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares sold in offering (in shares)	420,000
Aggregate net proceeds from stock offering	$ 60.1

Stockholders' Equity - Stock Re

Stockholders' Equity - Stock Repurchase Program (Details) $ in Millions	1 Months Ended
	Jul. 31, 2022 USD ($)
Equity [Abstract]
Stock repurchase program, period authorized	1 year
Stock repurchase program, authorized amount	$ 100

Stockholders' Equity - Equity I

Stockholders' Equity - Equity Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			12 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)				2,423,000
Weighted-average grant date fair value per share, stock options (in dollars per share)				$ 31.86	$ 26.55	$ 8.55
Stock-based compensation				$ 44,826	$ 24,230	$ 13,960
2019 Equity Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance, additional shares (in shares)				1,500,000
Shares available for future grant				6,000,000
Minimum exercise price of stock option, percentage				100%
Contractual term, stock options				10 years
2019 Equity Incentive Award Plan | Stock Options | Period One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage						25%
2019 Equity Incentive Award Plan | Stock Options | Period Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						3 years
2021 Performance Targets | Performance Based Stock Options | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)		700,000	700,000
Weighted-average grant date fair value per share, stock options (in dollars per share)		$ 55.96	$ 36.74
Award requisite service period			1 year
Target achievement performance threshold, percent			80%
Bookings target achievement performance threshold, percent			90%
Number of shares granted if target achievement performance threshold not met (in shares)			0
Shares award weighting percent for target achievement performance threshold, percent			50%
Shares award target achievement performance threshold, percent			100%
Awards percentage of total subject to service condition		97%
Performance targets services condition period			4 years
Stock-based compensation				$ 10,100
2021 Performance Targets | Performance Based Stock Options | Executive Officer | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards percentage of total subject to service condition	100%
Performance targets services condition period	4 years
2021 Performance Targets | Performance Based Stock Options | Period One | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage			25%
2021 Performance Targets | Performance Based Stock Options | Period One | Executive Officer | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	25%
2021 Performance Targets | Performance Based Stock Options | Period Two | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage			75%
Vesting period			36 months
Stock-based compensation				$ 3,600	$ 6,300
2021 Performance Targets | Performance Based Stock Options | Period Two | Executive Officer | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	75%
Vesting period	36 months

Stockholders' Equity - Stock Op

Stockholders' Equity - Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Stock Options, Number of Shares:
Stock options outstanding, beginning (in shares)	6,648
Stock options granted (in shares)	2,423
Stock options exercised (in shares)	(721)
Stock options forfeited (in shares)	(63)
Stock options outstanding, ending (in shares)	8,287	6,648
Stock Options, Weighted-Average Exercise Price Per Share:
Stock options outstanding, beginning (in dollars per share)	$ 17.46
Stock options granted (in dollars per share)	56.04
Stock options exercised (in dollars per share)	9.28
Stock options forfeited (in dollars per share)	35.74
Stock options outstanding, ending (in dollars per share)	$ 29.31	$ 17.46
Stock Options, Additional Disclosures
Weighted-average remaining contractual term, stock options outstanding	7 years 6 months
Aggregate intrinsic value, stock options outstanding	$ 325,828
Stock options vested and expected to vest (in shares)	8,028
Stock options vested and expected to vest (in dollars per share)	$ 28.64
Weighted-average remaining contractual term, stock options vested and expected to vest	7 years 4 months 24 days
Aggregate intrinsic value, stock options vested and expected to vest	$ 321,015
Stock options exercisable (in shares)	4,010
Stock options exercisable (in dollars per share)	$ 14.04
Weighted-average remaining contractual term, stock options exercisable	6 years 1 month 6 days
Aggregate intrinsic value, stock options exercisable	$ 218,143
Stock options, intrinsic value per share (in dollars per share)	$ 68.43
Total intrinsic value for exercised stock options	$ 31,000	$ 59,600	$ 6,700
Issuance of common stock under equity incentive plans, net of forfeitures	$ 6,700	$ 11,200	$ 900

Stockholders' Equity - Fair Val

Stockholders' Equity - Fair Value of Awards Granted (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value per share, stock options (in dollars per share)	$ 31.86	$ 26.55	$ 8.55
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value per share	18.51	12.93	5.52
2017 Nonqualified Employee Stock Purchase Plan | ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value per share	$ 52.91	$ 55.50	$ 19.40

Stockholders' Equity - Stock-Ba

Stockholders' Equity - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation	$ 44,826	$ 24,230	$ 13,960
Share-Based Payment Arrangement, Expense, Tax Benefit	$ 11,501	16,929	0
Percent of historical volatility	50%
Percent of implied volatility	50%
Products
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation	$ 1,666	790	575
Services
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation	1,034	668	450
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation	12,001	6,728	4,273
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation	12,165	6,769	4,736
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation	$ 17,960	$ 9,275	$ 3,926

Stockholders' Equity - ESPP (De

Stockholders' Equity - ESPP (Details) - ESPP $ in Millions	1 Months Ended		12 Months Ended
	May 31, 2020 shares	May 31, 2019 shares	Dec. 31, 2022 USD ($) period shares	Apr. 30, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average amortization period			9 months 18 days
2017 Nonqualified Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized (in shares)	800,000
Number of shares authorized (in shares)	6,300,000
Shares available for future grant			3,000,000
Weighted-average amortization period			9 months 18 days
Maximum contribution percent			25%
Employee termination period following purchase date to receive shares subject to risk of forfeiture			1 year
Number of shares authorized per purchase period	300,000
Shares available for issuance, additional shares (in shares)			800,000
Shares issued in period			600,000
Shares purchased for award			600,000
Unrecognized stock-based compensation expense | $			$ 9.3
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum employee subscription rate			15%
Maximum number of shares employee can purchase during offering period			2,000
Number of offering periods | period			2
Offering period			6 months
Price of common stock purchased under the ESPP			85%
Number of additional shares authorized (in shares)		1,300,000
Number of shares authorized (in shares)		12,400,000		11,100,000
Shares available for future grant			4,700,000
Shares purchased under ESPP (in shares)			200,000
Unrecognized stock-based compensation expense | $			$ 0.4
Weighted-average amortization period			1 month 6 days

Stockholders' Equity - Assumpti

Stockholders' Equity - Assumptions (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Stock Options
Weighted average assumptions used to estimate fair value of stock options
Expected volatility	58%	56%	53%
Expected life	6 years 1 month 6 days	6 years	6 years 1 month 6 days
Risk-free interest rate	3.15%	1.11%	0.48%
ESPP
Weighted average assumptions used to estimate fair value of stock options
Expected volatility	62%	63%	70%
Expected life	6 months	6 months	4 months 24 days
Risk-free interest rate	2.16%	0.05%	0.12%

Stockholders' Equity - Unrecogn

Stockholders' Equity - Unrecognized Stock-based Compensation Expenses (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense to be recognized in next twelve months	$ 37,200
Stock-based compensation expense to be recognized two years after filing	22,000
Stock-based compensation expense to be recognized three years after filing	16,000
Stock-based compensation expense to be recognized four years after filing	7,700
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense	$ 73,095
Weighted-average amortization period	2 years 3 months 18 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense	$ 9,781
Weighted-average amortization period	9 months 18 days

Stockholders' Equity - Shares R

Stockholders' Equity - Shares Reserved For Future Issuance (Details) - shares shares in Thousands	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	8,287	6,648
Shares available for future issuance (in shares)	22,028
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuance (in shares)	4,712
2019 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant under 2019 Plan (in shares)	5,986
2017 Nonqualified Employee Stock Purchase Plan | ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant under 2019 Plan (in shares)	3,000
Shares available for future issuance (in shares)	3,043

Employee Benefit Plan (Details)

Employee Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Company matching contributions, 401(K) Plan	$ 4.1	$ 3.2	$ 2.7

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	$ 568,428	$ 280,325	$ 154,028
Other comprehensive income (loss)	(2,153)	(129)	663
Balance at end of period	679,567	568,428	280,325
Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	(320)	(191)	(854)
Other comprehensive income (loss)	(2,153)	(129)	663
Balance at end of period	(2,473)	(320)	(191)
Unrealized Gains and Losses on Available-for-Sale Marketable Securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	(179)	0
Other comprehensive income (loss)	(1,521)	(179)
Balance at end of period	(1,700)	(179)	0
Foreign Currency Translation Adjustments
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	(141)	(191)
Other comprehensive income (loss)	(632)	50
Balance at end of period	$ (773)	$ (141)	$ (191)

Income Taxes - Loss before Prov

Income Taxes - Loss before Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Domestic	$ 51,442	$ 70,776	$ 33,777
Foreign	2,600	1,878	507
Income before income taxes	$ 54,042	$ 72,654	$ 34,284

Income Taxes - Components of In

Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 3,671	$ 0	$ 0
State	6,555	2,818	285
Foreign	874	438	507
Current income tax	11,100	3,256	792
Deferred:
Federal	6,336	(157,355)	0
State	(4,372)	(11,631)	0
Foreign	(32)	6	8
Deferred income tax	1,932	(168,980)	8
Income tax expense (benefit)	$ 13,032	$ (165,724)	$ 800

Income Taxes - Income Tax Rate

Income Taxes - Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Federal statutory rate	21%	21%	21%
Impact of state taxes	1.40%	(15.60%)	0.10%
Foreign operations	0%	(0.20%)	0.60%
R&D tax credits	(7.40%)		(4.80%)
R&D tax credits		1.40%
Foreign income inclusion	1%	0%	0%
Stock-based compensation	0%	(12.80%)	(4.10%)
Other permanent items	(0.20%)	(0.30%)	0.60%
Tax true-up	0%	(0.20%)	(0.40%)
Valuation allowance	(4.00%)	(208.30%)	(48.10%)
Net operating loss expiration / attribute expiration	5.50%	(13.10%)	37.40%
Base erosion anti-abuse tax	6.80%	0%	0%
Total	24.10%	(228.10%)	2.30%

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Net operating loss carryforwards	$ 44,189	$ 82,672
Tax credit carryforwards	56,717	52,538
Accruals and reserves	11,679	10,302
Deferred revenue	13,156	11,351
Stock-based compensation	7,417	4,921
Capitalized R&D	67,932	38,842
Gross deferred tax assets	201,090	200,626
Valuation allowance	(29,914)	(29,236)
Total deferred tax assets	171,176	171,390
Deferred tax liabilities:
Fixed assets	(2,648)	(1,511)
Intangible assets	(1,497)	(917)
Total deferred tax liabilities	(4,145)	(2,428)
Deferred tax assets	$ 167,031	$ 168,962

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year	$ 25,992	$ 23,516
Reduction for tax positions related to prior year	(905)	(1,427)
Additions for tax positions related to prior year	1,232	1,947
Additions for tax positions related to current year	2,896	1,956
Balance at end of year	$ 29,215	$ 25,992

Income Taxes - Textual (Details

Income Taxes - Textual (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Increase (decrease) in valuation allowance	$ 700,000
Valuation allowance	29,914,000	$ 29,236,000
Research and development credits	56,717,000	52,538,000
Unrecognized tax benefits	29,215,000	$ 25,992,000	$ 23,516,000
Unrecognized tax benefits that would impact effective tax rate	15,300,000
Accrued interest or penalties for uncertain income tax	0
U.S. Federal
Income Taxes [Line Items]
Operating loss carryforward	205,200,000
Research and development credits	40,700,000
State
Income Taxes [Line Items]
Operating loss carryforward	24,000,000
California State
Income Taxes [Line Items]
Research and development credits	47,000,000
Other State
Income Taxes [Line Items]
Research and development credits	$ 2,700,000

Net Income Per Common Share - B

Net Income Per Common Share - Basic and Diluted Shares Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Numerator:
Net income	$ 41,010	$ 238,378	$ 33,484
Denominator:
Weighted-average common shares - basic (in shares)	65,058	63,277	59,074
Effect of dilutive potential common shares (in shares)	3,853	4,579	2,924
Weighted-average common shares - diluted (in shares)	68,911	67,856	61,998
Basic net income (loss) per common share (in dollars per share)	$ 0.63	$ 3.77	$ 0.57
Diluted net income (loss) per common share (in dollars per share)	$ 0.60	$ 3.51	$ 0.54
Potentially dilutive shares, weighted-average (in shares)	1,758	1,006	753

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Revenue by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 867,827	$ 679,394	$ 541,239
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	786,802	565,964	473,779
Americas excluding U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	41,892	45,719	27,802
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	26,916	45,879	22,925
Middle East & Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	10,885	19,018	14,075
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 1,332	$ 2,814	$ 2,658

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Property and Equipment by Geographic Region (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 25,834	$ 21,783
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	21,785	19,900
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	3,220	1,840
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 829	$ 43

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Contract Costs (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Capitalized contract cost, gross	$ 11,200,000	$ 7,400,000
Capitalized contract cost, amortization	4,000,000	1,400,000
Capitalized contract cost, impairment	$ 0	$ 0

Revenue from Contracts with C_6

Revenue from Contracts with Customers - Performance Obligation (Details) $ in Millions	Dec. 31, 2022 USD ($)
Revenue from Contract with Customer [Abstract]
Performance obligations expected to be satisfied	$ 199
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	35%
Performance obligations expected to be satisfied, expected timing	12 months

Revenue from Contracts with C_7

Revenue from Contracts with Customers - Contract Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract with customer, asset	$ 2.3		$ 1.7
Contract with customer, asset, expected to be billed, percent	81%
Contract with customer, asset, prior period, not recognized		$ 0.3
Deferred revenue	$ 58.6	$ 49.5
Contract with customer, liability, revenue recognized	26.8
Increase (Decrease) in Contract with Customer, Liability	$ 9.1

Revenue from Contracts with C_8

Revenue from Contracts with Customers - Concentration Risk (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Lumen Technologies, Inc. | Revenue from Contract with Customer Benchmark
Concentration Risk [Line Items]
Concentration of credit risk, percentage		11%
One Customer | Accounts Receivable
Concentration Risk [Line Items]
Concentration of credit risk, percentage	11%
Customer Two | Accounts Receivable
Concentration Risk [Line Items]
Concentration of credit risk, percentage	12%