A10 Networks (ATEN) 10-Q 5 May 22 2022 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2022	Apr. 29, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	001-36343
Entity Registrant Name	A10 NETWORKS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-1446869
Entity Address, Address Line One	2300 Orchard Parkway
Entity Address, City or Town	San Jose
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95131
City Area Code	408
Local Phone Number	325-8668
Title of 12(b) Security	Common Stock, $0.00001 par value
Trading Symbol	ATEN
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		75,824,501
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001580808
Current Fiscal Year End Date	--12-31

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 67,758	$ 78,925
Marketable securities	96,945	106,117
Accounts receivable, net of allowances of $708 and $543, respectively	49,282	61,795
Inventory	20,832	22,462
Prepaid expenses and other current assets	17,416	14,720
Total current assets	252,233	284,019
Property and equipment, net	13,460	10,692
Goodwill	1,307	1,307
Deferred tax assets, net	65,555	65,773
Other non-current assets	29,192	31,294
Total assets	361,747	393,085
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	4,994	6,852
Accrued liabilities	30,213	36,101
Deferred revenue	74,125	73,132
Total current liabilities	109,332	116,085
Deferred revenue, non-current	47,224	48,499
Other non-current liabilities	19,214	19,613
Total liabilities	175,770	184,197
Commitments and contingencies (Note 2 and Note 5)
Stockholders' equity:
Common stock, $0.00001 par value: 500,000 shares authorized; 85,117 and 84,717 shares issued and 75,701 and 77,423 shares outstanding, respectively	1	1
Treasury stock, at cost: 9,416 and 7,294 shares, respectively	(83,999)	(55,677)
Additional paid-in-capital	449,742	446,035
Dividends paid	(7,749)	(3,880)
Accumulated other comprehensive income	(1,005)	(229)
Accumulated deficit	(171,013)	(177,362)
Total stockholders' equity	185,977	208,888
Total liabilities and stockholders' equity	$ 361,747	$ 393,085

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 708	$ 543
Common Stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	85,117,000	84,177,000
Common stock, shares outstanding (in shares)	75,701,000	77,423,000
Treasury Stock, Shares	9,416,000	7,294,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue:
Total revenue	$ 62,672	$ 54,843
Cost of revenue:
Total cost of revenue	12,839	12,499
Gross profit	49,833	42,344
Operating expenses:
Sales and marketing	22,782	19,092
Research and development	12,887	13,981
General and administrative	6,162	5,247
Total operating expenses	41,831	38,320
Income from operations	8,002	4,024
Non-operating expense, net:
Interest and other expense, net	(513)	(1,183)
Total non-operating expense, net	(513)	(1,183)
Income before provision for income taxes	7,489	2,841
Provision for income taxes	1,140	184
Net income	$ 6,349	$ 2,657
Net income per share:
Basic	$ 0.08	$ 0.03
Diluted	$ 0.08	$ 0.03
Weighted-average shares used in computing net income per share:
Basic	76,795	76,704
Diluted	79,285	79,636
Products
Revenue:
Total revenue	$ 37,045	$ 30,540
Cost of revenue:
Total cost of revenue	8,633	7,086
Services
Revenue:
Total revenue	25,627	24,303
Cost of revenue:
Total cost of revenue	$ 4,206	$ 5,413

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 6,349	$ 2,657
Other comprehensive income, net of tax:
Unrealized loss on marketable securities	(776)	(88)
Comprehensive income	$ 5,573	$ 2,569

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 Income (Loss)	Accumulated Deficit	Treasury Stock	Dividends Declared
Beginning balance at Dec. 31, 2020	$ 115,974	$ 1	$ 425,534	$ 98	$ (272,249)	$ (37,410)	$ 0
Beginning balance (in shares) at Dec. 31, 2020		76,346
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee equity incentive plans (in shares)		765
Common stock issued under employee equity incentive plans	0		1,756
Unrealized loss on marketable securities	(88)			(88)
Net income	2,657				2,657
Ending balance (in shares) at Mar. 31, 2021		77,102
Ending balance at Mar. 31, 2021	124,659	$ 1	431,738	10	(269,592)	$ (37,498)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends, Common Stock, Cash							0
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition			4,448
Stock Repurchased During Period, Value	$ (88)
Treasury Stock, Shares, Acquired						(9)
Common stock, shares outstanding (in shares)	77,423
Beginning balance at Dec. 31, 2021	$ 208,888	$ 1	446,035	(229)	(177,362)	$ (55,677)	(3,880)
Beginning balance (in shares) at Dec. 31, 2021		77,423
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee equity incentive plans (in shares)		400
Common stock issued under employee equity incentive plans	0		165
Unrealized loss on marketable securities	(776)			(776)
Net income	6,349				6,349
Ending balance (in shares) at Mar. 31, 2022		75,701
Ending balance at Mar. 31, 2022	185,977	$ 1	449,742	$ (1,005)	$ (171,013)	$ (83,999)	(7,749)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends, Common Stock, Cash							$ (3,869)
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition			$ 3,542
Stock Repurchased During Period, Value	$ (28,322)
Treasury Stock, Shares, Acquired	(2,100)					(2,122)
Common stock, shares outstanding (in shares)	75,701

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income	$ 6,349	$ 2,657
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,844	2,413
Stock-based compensation	3,452	4,399
Other non-cash items	287	181
Changes in operating assets and liabilities:
Accounts receivable	12,535	(315)
Inventory	1,433	1,086
Prepaid expenses and other assets	(1,568)	(60)
Accounts payable	(1,857)	(501)
Accrued liabilities	(6,287)	(12,106)
Deferred revenue	(280)	4,519
Net cash provided by operating activities	15,908	2,273
Cash flows from investing activities:
Proceeds from sales of marketable securities	4,550	1,300
Proceeds from maturities of marketable securities	17,173	24,140
Purchases of marketable securities	(13,635)	(36,197)
Purchases of property and equipment	(3,137)	(769)
Net cash provided by (used in) investing activities	4,951	(11,526)
Cash flows from financing activities:
Proceeds from issuance of common stock under employee equity incentive plans	165	1,756
Repurchase of common stock	(28,322)	(88)
Payments for dividends	(3,869)	0
Net cash provided by (used in) financing activities	(32,026)	1,668
Net decrease in cash and cash equivalents	(11,167)	(7,585)
Cash and cash equivalents—beginning of period	78,925	83,281
Cash and cash equivalents—end of period	67,758	75,696
Non-cash investing and financing activities:
Transfers between inventory and property and equipment	196	97
Purchases of property and equipment included in accounts payable	$ 1	$ 172

Description of Business and Sum

Description of Business and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Significant Accounting Policies	Description of Business and Summary of Significant Accounting Policies Description of Business A10 Networks, Inc. (together with our subsidiaries, the “Company”, “we”, “our” or “us”) was incorporated in California in 2004 and reincorporated in Delaware in March 2014. We are headquartered in San Jose, California and have wholly-owned subsidiaries throughout the world including Asia and Europe. We are a leading provider of networking solutions that enable next-generation networks focused on reliability, availability, scalability and cybersecurity. Our portfolio supports customers operating in the cloud, on-premise or in hybrid environments providing rapid return on their investment as well as investment protection with best-in-class technical performance. As cyber-attacks increase in volume and complexity, we integrate security as a key attribute in our solutions that further enable our customers to continue to adapt to market trends in cloud, internet of things and the ever increasing need for more data, building upon our strong global footprint and leadership in application and network infrastructure. Our customers include leading service providers (cloud, telecommunications, multiple system operators, cable), government organizations, and enterprises. Our product portfolio provides cybersecurity and infrastructure solutions. The portfolio consists of the following major categories; Standalone Thunder Application Delivery Controller (ADC), Carrier-Grade Network Access Translation (CGNAT)/Convergent Firewall (CFW) and Thunder Threat Protection System (TPS) for DDOS protection/Secure Socket Layer Insight (SSLi). In addition, we deliver management, automation and analytics tools including Harmony Controller and aGalaxy. Our products are offered in a variety of form factors and payment models, including physical appliances and perpetual and subscription-based software licenses, as well as pay-as-you-go licensing models and FlexPool, a flexible consumption-based software model. We derive revenue from sales of products and related support services. Products revenue is generated primarily by sales of hardware appliances with perpetual licenses to our embedded software solutions. We also derive revenue from licenses to, or subscription services for, software-only versions of our solutions. We generate services revenue primarily from sales of maintenance and support contracts. Our customers predominantly purchase maintenance and support in conjunction with purchases of our products. We sell our products globally to service providers and enterprises that depend on data center applications and networks to generate revenue and manage operations efficiently. We report two customer verticals: service providers and enterprises and we report customer revenues in three geographic regions: the Americas, Asia Pacific and EMEA. In the three months ended March 31, 2022, we changed the way we present revenue by geographic region. Our previously reported customer revenues in the Japan and the Asia Pacific (excluding Japan) regions are now combined in the Asia Pacific region. We believe our two customer verticals and our revised geographic view aligns with how we manage the business and maps our product portfolio to customer verticals. Our end-customers operate in a variety of industries, including telecommunications, technology, industrial, retail, financial, gaming, education and government. Since inception, our customer base has grown rapidly. As of March 31, 2022, we have sold our products to more than 7,800 end-customers worldwide since our inception. We sell substantially all of our solutions through our high-touch sales organization as well as distribution channel partners, including distributors, value-added resellers and system integrators, and fulfill nearly all orders globally through such partners. We believe this sales approach allows us to obtain the benefits of channel distribution, such as expanding our market coverage, while still maintaining face-to-face relationships with our end-customers. We outsource the manufacturing of our hardware products to original design manufacturers. We perform quality assurance and testing at our San Jose, Taiwan and Japan distribution centers, as well as at our manufacturers’ locations. Basis of Presentation The accompanying unaudited condensed consolidated financial statements include those of A10 Networks, Inc. and its subsidiaries after elimination of all intercompany accounts and transactions. We have prepared the accompanying unaudited condensed consolidated financial statements pursuant to the rules and regulations of the United States Securities and Exchange Commission (the “SEC” or the “Commission”). As permitted under these rules and regulations, we have condensed or omitted certain financial information and footnote disclosures we normally include in our annual consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The unaudited condensed consolidated balance sheet as of December 31, 2021 has been derived from our audited financial statements, which are included in our 2021 Annual Report on Form 10-K for the year ended December 31, 2021 on file with the SEC (the “2021 Annual Report”). These financial statements have been prepared on the same basis as our annual financial statements and, in management’s opinion, reflect all adjustments consisting only of normal recurring adjustments that are necessary for a fair presentation of our financial information. Our interim period operating results do not necessarily indicate the results that may be expected for any other interim period or for the full fiscal year. These financial statements and accompanying notes should be read in conjunction with the financial statements and accompanying notes thereto in the 2021 Annual Report. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Those estimates and assumptions affect revenue recognition and deferred revenue, the allowance for doubtful accounts, the sales return reserve, the valuation of inventory, the fair value of marketable securities, contingencies and litigation, accrued liabilities, deferred commissions and the determination of fair value of stock-based compensation. These estimates are based on information available as of the date of the condensed consolidated financial statements. Significant Accounting Policies The Company’s significant accounting policies are disclosed in Part II – Item 8, “Financial Statements and Supplementary Data” of the Company’s Annual Report on Form 10-K for the year ended December 31, 2021 filed with the SEC on March 8, 2022. There have been no material changes to the Company’s significant accounting policies during the three months ended March 31, 2022. Concentration of Credit Risk and Significant Customers Financial instruments that potentially subject us to concentrations of credit risk consist of cash, cash equivalents, marketable securities and accounts receivable. Our cash, cash equivalents and marketable securities are held and invested in high-credit quality financial instruments by recognized financial institutions and are subject to minimum credit risk. Our accounts receivable are unsecured and represent amounts due to us based on contractual obligations of our customers. We mitigate credit risk in respect to accounts receivable by performing periodic credit evaluations based on a number of factors, including past transaction experience, evaluation of credit history and review of the invoicing terms of the contract. We generally do not require our customers to provide collateral to support accounts receivable. Significant customers, including distribution channel partners and direct customers, are those which represent 10% or more of our total revenue for each period presented or our gross accounts receivable balance as of each respective balance sheet date. Revenues from our significant customers as a percentage of our total revenue are as follows: Three Months Ended March 31, Customers 2022 2021 Customer A (an end-customer) 17% * Customer B (a distribution channel partner) 11% 12% Customer C (a distribution channel partner) * 10% * represents less than 10% of total revenue As of March 31, 2022, three customers accounted for 21%, 12% and 10%, respectively, of our total gross accounts receivable. As of December 31, 2021, two customers accounted for 14% and 11%, respectively, of our total gross accounts receivable. Recently Adopted Accounting Pronouncements Effective January 1, 2020, the Company adopted Accounting Standards Update (“ASU”) No. 2016-13, Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”), as amended, using a modified retrospective approach, with certain exceptions allowed. The standard amends the guidance for measuring and recording credit losses on financial assets measured at amortized cost by replacing the incurred-loss model with an expected-loss model. This new standard also requires that credit losses related to available-for-sale debt securities be recorded as an allowance through net income rather than by reducing the carrying amount under the current, other-than-temporary-impairment model. The adoption of ASU 2016-13 did not have a significant impact on the Company’s condensed consolidated financial statements. In January 2017, the Financial Accounting Standards Board (“FASB”) issued ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). ASU 2017-04 simplifies the accounting for goodwill impairments by eliminating the requirement to compare the implied fair value of goodwill with its carrying amount as part of step two of the goodwill impairment test referenced in ASC 350, Intangibles – Goodwill and Other . As a result, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value. However, the impairment loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. In January 2020, the Company adopted ASU 2017-04, and the adoption did not have a significant impact on the Company’s condensed consolidated financial statements. Effective January 1, 2020, the Company adopted ASU No. 2018-13, Fair Value Measurement (Topic 820 – Changes to the Disclosure Requirements for the Fair Value Measurement) (“ASU 2018-13”). Under ASU 2018-13, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but public companies will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. The adoption of ASU 2018-13 did not have a significant impact on the Company’s condensed consolidated financial statements. In November 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes . The amendments in this update improve consistent application of and simplify U.S. GAAP for Topic 740 by clarifying and amending existing guidance for, among other items, intra-period allocation, reporting tax law changes and losses in interim periods, state and local taxes not fully based on income and recognition of deferred tax liability related to certain transactions. There is also new guidance related to consolidated group reporting and tax impacts resulting from business combinations. The Company adopted this guidance effective January 1, 2021 and the adoption of this guidance did not have a significant impact on the Company’s condensed consolidated financial statements. In October 2020, the FASB issued ASU No. 2020-10, Codification Improvements . The amendments in this ASU improve the consistency of the codification and reorganize the guidance into appropriate sections providing less opportunities for disclosures to be missed. The amendments in this update do not change U.S. GAAP and are not expected to result in a significant change in practice. The Company adopted this guidance on January 1, 2021 and the adoption of this guidance did not have a significant impact on the Company’s condensed consolidated financial statements.

Leases

Leases	3 Months Ended
	Mar. 31, 2022
Leases [Abstract]
Leases	Leases The Company leases various operating spaces in the United States, Asia and Europe under non-cancellable operating lease arrangements that expire on various dates through July 2027. These arrangements require us to pay certain operating expenses, such as taxes, repairs and insurance, and contain renewal and escalation clauses. The table below presents the Company’s right-of-use assets and lease liabilities as of March 31, 2022 (in thousands): March 31, 2022 Operating leases Right-of-use assets: Other non-current assets $ 22,347 Total right-of-use assets $ 22,347 Lease liabilities: Accrued liabilities $ 3,906 Other non-current liabilities 18,898 Total operating lease liabilities $ 22,804 The aggregate future lease payments for non-cancelable operating leases as of March 31, 2022 were as follows (in thousands): Remainder of 2022 $ 3,416 2023 4,559 2024 4,667 2025 4,778 2026 4,892 Thereafter 2,414 Total lease payments 24,726 Less: imputed interest (1,922) Present value of lease liabilities $ 22,804 The components of lease costs were as follows (in thousands): Three Months Ended March 31, 2022 2021 Operating lease costs $ 1,071 $ 1,373 Short-term lease costs 130 147 Total lease costs $ 1,201 $ 1,520 Average lease terms and discount rates for the Company’s operating leases were as follows: March 31, 2022 Weighted-average remaining term (years) 5.30 Weighted-average discount rate 3.17% Supplemental cash flow information for the Company’s operating leases were as follows (in thousands): Three Months Ended March 31, 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,290 Right-of-use assets obtained in exchange for new lease liabilities $ 672

Marketable Securities and Fair

Marketable Securities and Fair Value Measurements	3 Months Ended
	Mar. 31, 2022
Fair Value Disclosures [Abstract]
Marketable Securities and Fair Value Measurements	Marketable Securities and Fair Value Measurements Marketable Securities Marketable securities, classified as available-for-sale, consisted of the following (in thousands): March 31, 2022 December 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Corporate securities $ 50,263 $ — $ (699) $ 49,564 $ 62,588 $ 1 $ (168) $ 62,421 U.S. Treasury and agency securities 19,906 — (278) 19,628 13,904 — (59) 13,845 Commercial paper 22,083 — — 22,083 23,570 — — 23,570 Asset-backed securities 5,698 — (28) 5,670 6,285 — (4) 6,281 Total $ 97,950 $ — $ (1,005) $ 96,945 $ 106,347 $ 1 $ (231) $ 106,117 During the three months ended March 31, 2022 and 2021, we did not reclassify any amount to earnings from accumulated other comprehensive income related to unrealized gains or losses. The following table summarizes the cost and estimated fair value of marketable securities based on stated effective maturities as of March 31, 2022 (in thousands): Amortized Cost Fair Value Less than 1 year $ 62,717 $ 62,429 Mature in 1 - 3 years 35,233 34,516 Total $ 97,950 $ 96,945 All available-for-sale securities have been classified as current because they are available for use in current operations. Marketable securities in an unrealized loss position as of March 31, 2022 consisted of the following (in thousands): Less Than 12 Months 12 Months or More Total As of March 31, 2022 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Corporate securities $ 47,549 $ (699) $ — $ — $ 47,549 $ (699) U.S. Treasury and agency securities 19,628 (278) — — 19,628 (278) Asset-backed securities 5,670 (28) — — 5,670 (28) $ 72,847 $ (1,005) $ — $ — $ 72,847 $ (1,005) Marketable securities in an unrealized loss position as of December 31, 2021 consisted of the following (in thousands): Less Than 12 Months 12 Months or More Total As of December 31, 2021 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Corporate securities $ 62,012 $ (168) $ — $ — $ 62,012 $ (168) U.S. Treasury and agency securities 13,845 (59) — — 13,845 (59) Asset-backed securities 6,281 (4) — — 6,281 (4) $ 82,138 $ (231) $ — $ — $ 82,138 $ (231) Based on evaluation of securities that have been in a continuous loss position, we did not recognize any other-than-temporary impairment charges during the three months ended March 31, 2022 and 2021. Fair Value Measurements The following is a summary of our cash, cash equivalents and marketable securities measured at fair value on a recurring basis (in thousands): March 31, 2022 December 31, 2021 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Cash $ 42,238 $ — $ — $ 42,238 $ 62,021 $ — $ — $ 62,021 Cash equivalents 25,520 — — 25,520 16,904 — — 16,904 Corporate securities — 49,564 — 49,564 — 62,421 — 62,421 U.S. Treasury and agency securities — 19,628 — 19,628 — 13,845 — 13,845 Commercial paper — 22,083 — 22,083 — 23,570 — 23,570 Asset-backed securities — 5,670 — 5,670 — 6,281 — 6,281 Total $ 67,758 $ 96,945 $ — $ 164,703 $ 78,925 $ 106,117 $ — $ 185,042 There were no transfers between Level 1 and Level 2 fair value measurement categories during the three months ended March 31, 2022 and 2021.

Condensed Consolidated Financia

Condensed Consolidated Financial Statement Details	3 Months Ended
	Mar. 31, 2022
Property, Plant and Equipment [Abstract]
Condensed Consolidated Financial Statement Details	Condensed Consolidated Financial Statement Details Inventory Inventory consisted of the following (in thousands): March 31, December 31, Raw materials $ 9,876 $ 10,774 Finished goods 10,956 11,688 Total inventory $ 20,832 $ 22,462 Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consisted of the following (in thousands): March 31, December 31, Prepaid expenses $ 4,735 $ 4,326 Deferred contract acquisition costs 8,589 7,399 Other 4,092 2,995 Total prepaid expenses and other current assets $ 17,416 $ 14,720 Property and Equipment, Net Property and equipment, net, consisted of the following (in thousands): Useful Life March 31, December 31, (in years) Equipment 1 - 5 $ 27,087 $ 25,407 Software 1 - 3 840 807 Furniture and fixtures 1 - 7 545 545 Leasehold improvements Lease term 3,236 3,231 Construction in process 6,169 4,823 Property and equipment, gross 37,877 34,813 Less: accumulated depreciation (24,417) (24,121) Property and equipment, net $ 13,460 $ 10,692 Construction in process primarily consists of deferred software development costs related to several projects that are expected to take longer than one year to complete. We expect the largest of these projects to be available for release to customers in the fourth quarter of 2022. Depreciation expense on property and equipment was $0.7 million for each of the three-month periods ended March 31, 2022 and 2021. Intangible Assets Purchased intangible assets, which included developed technology and patents, were fully amortized as of December 31, 2021. Amortization expense related to these purchased intangible assets was $0.4 million for the three months ended March 31, 2021. Accrued Liabilities Accrued liabilities consisted of the following (in thousands): March 31, December 31, Accrued compensation and benefits $ 15,635 $ 24,003 Accrued tax liabilities 3,118 1,020 Lease liability 3,906 3,983 Other 7,554 7,095 Total accrued liabilities $ 30,213 $ 36,101 Deferred Revenue Deferred revenue consisted of the following (in thousands): March 31, December 31, Deferred revenue: Products $ 6,259 $ 6,164 Services 115,090 115,467 Total deferred revenue 121,349 121,631 Less: current portion (74,125) (73,132) Non-current portion $ 47,224 $ 48,499

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Lease Commitments We lease various operating spaces in the United States, Asia and Europe under non-cancelable operating lease arrangements that expire on various dates through July 2027. These arrangements require us to pay certain operating expenses, such as taxes, repairs and insurance, and contain renewal and escalation clauses. We recognize rent expense under these arrangements on a straight-line basis over the term of the lease. See Note 2 – Leases for the Company’s aggregate future lease payments for the Company’s non-cancelable operating leases as of March 31, 2022. Rent expense was $1.2 million and $1.4 million for three months ended March 31, 2022 and 2021, respectively. Purchase Commitments We have open purchase commitments with third-party contract manufacturers with facilities in Taiwan to supply nearly all of our finished goods inventories, spare parts, and accessories. These purchase orders are expected to be paid within one year of the issuance date. We had open purchase commitments with manufacturers in Taiwan totaling $34.9 million as of March 31, 2022. Guarantees and Indemnifications In the normal course of business, we provide indemnifications to customers against claims of intellectual property infringement made by third parties arising from the use of our products. Other guarantees or indemnification arrangements include guarantees of product and service performance, and standby letters of credit for lease facilities and corporate credit cards. We have not recorded a liability related to these indemnification and guarantee provisions and our guarantees and indemnification arrangements have not had any significant impact on our condensed consolidated financial statements to date.

Equity Incentive Plans and Stoc

Equity Incentive Plans and Stock-Based Compensation	3 Months Ended
	Mar. 31, 2022
Share-based Payment Arrangement [Abstract]
Equity Incentive Plans and Stock-Based Compensation	Equity Incentive Plans, Stock-Based Compensation and Stock Repurchase Program Equity Incentive Plans 2014 Equity Incentive Plan The 2014 Equity Incentive Plan (the “2014 Plan”) provides for the granting of stock options, restricted stock awards, restricted stock units (“RSUs”), performance-based RSUs (“PSUs”), stock appreciation rights, performance units and performance shares to our employees, consultants and members of our Board of Directors. The shares authorized for the 2014 Plan increase annually by the lesser of (i) 8,000,000 shares, (ii) 5% of the outstanding shares of common stock on the last day of our immediately preceding fiscal year, or (iii) such other lesser amount as determined by our Board of Directors. In November 2020, our Board of Directors determined the current shares authorized under the 2014 Plan were sufficient for the time being and decided not to increase the number of shares authorized in 2021. As of March 31, 2022, we had 9,870,741 shares available for future grant under the 2014 Plan. 2014 Employee Stock Purchase Plan In October 2018, the Board of Directors approved amending the 2014 Employee Stock Purchase Plan (the “Amended 2014 Purchase Plan”) in order to, among other things, reduce the maximum contribution participants can make under the plan from 15% to 10% of eligible compensation. The Amended 2014 Purchase Plan also reflects revised offering periods, which were changed from 24 months to six months in duration and that begin on or about December 1 and June 1 each year, starting in December 2018. As of March 31, 2022, the Company had 1,386,639 shares available for future issuance under the Amended 2014 Purchase Plan. Stock-Based Compensation A summary of our stock-based compensation expense is as follows (in thousands): Three Months Ended March 31, 2022 2021 Stock-based compensation by type of award: Stock awards $ 3,100 $ 4,123 Employee stock purchase rights 352 276 $ 3,452 $ 4,399 Stock-based compensation by category of expense: Cost of revenue $ 399 $ 572 Sales and marketing 1,099 1,264 Research and development 788 1,431 General and administrative 1,166 1,132 $ 3,452 $ 4,399 As of March 31, 2022, the Company had $25.5 million of unrecognized stock-based compensation expense related to unvested stock-based awards, including ESPP under our Amended 2014 Purchase Plan, which will be recognized over a weighted-average period of 2.02 years. Stock Options The following table summarizes our stock option activities and related information: Number of Shares (thousands) Weighted-Average Exercise Price Per Share Weighted-Average Remaining Contractual Term Aggregate Intrinsic Value (thousands) Outstanding as of December 31, 2021 871 $ 6.13 Granted — — Exercised (35) 5.68 Canceled — — Outstanding as of March 31, 2022 836 6.15 2.14 $ 6,523 Vested and exercisable as of March 31, 2022 836 $ 6.15 2.14 $ 6,523 As of March 31, 2022, the aggregate intrinsic value represents the excess of the closing price of our common stock of $13.95 over the exercise price of the outstanding in-the-money options. The intrinsic value of options exercised was $0.3 million and $1.5 million during the three months ended March 31, 2022 and 2021, respectively. Stock Awards The Company has granted RSUs to its employees, consultants and members of its Board of Directors, and PSUs to certain executives and employees. The Company’s PSUs have market performance-based vesting conditions as well as service-based vesting conditions. As of March 31, 2022, there were 2,709,481 RSUs and 1,021,009 PSUs outstanding. The following table summarizes our stock award activities and related information: Number of Shares (thousands) Weighted-Average Grant Date Fair Value Per Share Weighted-Average Remaining Vesting Term Aggregate Fair Value (thousands) Nonvested as of December 31, 2021 3,717 $ 8.56 Granted 496 12.44 Released (365) 6.47 Canceled (117) 8.44 Nonvested as of March 31, 2022 3,731 $ 9.28 1.48 $ 52,040 The aggregate fair value of stock awards released was $2.4 million and $4.0 million for the three months ended March 31, 2022 and 2021, respectively. Stock Repurchase Program

Net Loss Per Share

Net Loss Per Share	3 Months Ended
	Mar. 31, 2022
Earnings Per Share [Abstract]
Net Loss Per Share	Net Income Per Share Basic net income per share is computed using the weighted average number of common shares outstanding for the period. Diluted net income per share applying the treasury stock method is computed using the weighted average number of common shares outstanding for the period plus potential dilutive common shares, including stock options, RSUs and employee stock purchase rights, unless the potential common shares are anti-dilutive. Basic and diluted net income per share are calculated as follows (in thousands, except per share amounts): Three Months Ended March 31, 2022 2021 Basic and diluted net income per share Numerator: Net income $ 6,349 $ 2,657 Denominator: Weighted-average shares outstanding - basic 76,795 76,704 Effect of dilutive potential common shares from stock options, stock awards and employee stock purchase plan 2,490 2,932 Weighted-average shares outstanding - diluted 79,285 79,636 Net income per share: Basic $ 0.08 $ 0.03 Diluted $ 0.08 $ 0.03 The following table presents common shares related to potentially dilutive shares excluded from the calculation of diluted net income (loss) per share as their effect would have been anti-dilutive (in thousands): Three Months Ended March 31, 2022 2021 Stock options, restricted stock units and employee stock purchase rights 233 67

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We recorded income tax expense of $1.1 million and $0.2 million for the three months ended March 31, 2022 and 2021, respectively, which primarily consisted of U.S. taxes for the three months ended March 31, 2022. For the three months ended March 31, 2021, income tax expense primarily consisted of foreign taxes. Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the carrying amounts of existing assets and liabilities in the financial statements and their respective tax bases using tax rates expected to be in effect during the years in which the basis differences reverse. Recognition of deferred tax assets is appropriate when realization of these assets is more likely than not. Primarily based upon a strong earnings history, expectation of future taxable income, with the exception of certain state tax attributes, we believe that a significant amount of the deferred tax assets would be realized on a more likely than not basis as of September 30, 2021. Therefore we released the valuation allowance on our U.S. deferred tax assets except for state credits in 2021. For the three months ended March 31, 2022, we recorded no change in our net valuation allowance. We had $6.5 million of unrecognized tax benefits as of March 31, 2022. We do not anticipate a material change to our unrecognized tax benefits over the next twelve months. Unrecognized tax benefits may change during the next twelve months for items that arise in the ordinary course of business. Accrued interest and penalties related to unrecognized tax benefits are recognized as part of our provision for income taxes in our condensed consolidated statements of operations. We are subject to taxation in the United States, various states, and several foreign jurisdictions. Because we have net operating loss and credit carryforwards, there are open statutes of limitations in which federal, state, and foreign taxing authorities may examine our tax returns for all years from 2005 through the current period. We are not currently under examination by any taxing authorities. On December 22, 2017, the Tax Act was signed into law. The Tax Act significantly revised the U.S. tax code generally effective January 1, 2018. Beginning in 2022 the Tax Act requires capitalization of research and development costs. While we continue to evaluate the impact of the delayed effective date, we currently believe that this provision will not materially impact our income tax provision. On June 29, 2020, the California Governor signed Assembly Bill 85 (“A.B. 85”), which includes several tax measures, provides for a three-year suspension of the use of NOLs for medium and large businesses and a three-year limit on the use of business incentive tax credits to offset no more than $5 million of tax per year. The three-year term was subsequently revised to a two-year term and has been accounted for in our income tax provision.

Geographic Information

Geographic Information	3 Months Ended
	Mar. 31, 2022
Segment Reporting [Abstract]
Geographic Information	Geographic Information In the three months ended March 31, 2022, we changed the way we present revenue by geographic region. We now report customer revenues in three geographic regions: the Americas, Asia Pacific and EMEA. Our previously reported customer revenues in the Japan and the Asia Pacific (excluding Japan) regions are now combined in the Asia Pacific region. This change in the way we report revenue had no impact to our key metrics including operations, comprehensive income and accumulated deficit. The following table depicts the disaggregation of revenue by geographic region based on the ship to location of our customers and is consistent with how we evaluate our financial performance (in thousands): Three Months Ended March 31, 2022 2021 Americas $ 32,958 $ 26,270 Asia Pacific 17,789 19,954 EMEA 11,925 8,619 Total revenue $ 62,672 $ 54,843 The following table is a summary of our long-lived assets which include property and equipment, net and operating lease right-of-use assets based on the physical location of the assets (in thousands): March 31, December 31, United States $ 34,671 $ 32,255 Japan 161 422 India 599 513 Other 376 368 Total $ 35,807 $ 33,558

Revenue Revenue

Revenue Revenue	3 Months Ended
	Mar. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Contract Balances The following table reflects contract balances with customers (in thousands): March 31, December 31, 2021 Accounts receivable, net $ 49,282 $ 61,795 Deferred revenue, current 74,125 73,132 Deferred revenue, non-current 47,224 48,499 We receive payments from customers based upon billing cycles. Invoice payment terms usually range from 30 to 90 days. Accounts receivable are recorded when the right to consideration becomes unconditional. Contract assets include amounts related to our contractual right to consideration for performance obligations not yet billed and are included in prepaid and other current assets in the condensed consolidated balance sheets. The amounts were immaterial as of March 31, 2022 and December 31, 2021. Deferred revenue primarily consists of amounts that have been invoiced but not yet been recognized as revenue and consists of performance obligations pertaining to support and subscription services. We recognized revenue of $24.6 million and $23.1 million during the three months ended March 31, 2022 and 2021, respectively, related to deferred revenues at the beginning of the respective periods. Deferred Contract Acquisition Costs We capitalize certain contract acquisition costs consisting of incremental sales commissions incurred to obtain customer contracts. Deferred commissions related to product revenues are recognized upon transfer of control to customers. Deferred commissions related to services revenue are recognized as the related performance obligations are met. Deferred commissions that will be recognized during the succeeding 12-month period are recorded as prepaid expenses and other current assets, and the remaining portion is recorded as other non-current assets. Amortization of deferred commissions is included in sales and marketing expense. As of March 31, 2022, the current and non-current portions of deferred contract acquisition costs were $8.6 million and $4.1 million, respectively. As of December 31, 2021, the current and non-current portions of deferred contract acquisition costs were $7.4 million and $4.5 million, respectively. Related amortization expense was $2.0 million and $1.7 million for the three months ended March 31, 2022 and 2021, respectively. We had no impairment loss in relation to the costs capitalized and no asset impairment charges related to contract assets during the three months ended March 31, 2022 and 2021. Remaining Performance Obligations Remaining performance obligations represent contracted revenues that are non-cancellable and have not yet been recognized due to unsatisfied or partially satisfied performance obligations, which include deferred revenues and amounts that will be invoiced and recognized as revenues in future periods. We expect to recognize revenue on the remaining performance obligations as follows (in thousands): March 31, 2022 Within 1 year $ 74,125 Next 2 to 3 years 37,615 Thereafter 9,609 Total $ 121,349

Subsequent Event

Subsequent Event	3 Months Ended
	Mar. 31, 2022
Subsequent Events [Abstract]
Subsequent Event	Subsequent EventsOn May 3, 2022, the Company announced its Board of Directors declared a quarterly dividend. The dividend, in the amount of $0.05 per share outstanding, will be paid on June 1, 2022 to shareholders of record on May 16, 2022 as a return of capital. Future dividends will be subject to further review and approval by the Board in accordance with applicable law. The Board reserves the right to adjust or withdraw the quarterly dividend in future periods as it reviews the Company’s capital allocation strategy from time-to-time.

Description of Business and S_2

Description of Business and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements include those of A10 Networks, Inc. and its subsidiaries after elimination of all intercompany accounts and transactions. We have prepared the accompanying unaudited condensed consolidated financial statements pursuant to the rules and regulations of the United States Securities and Exchange Commission (the “SEC” or the “Commission”). As permitted under these rules and regulations, we have condensed or omitted certain financial information and footnote disclosures we normally include in our annual consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The unaudited condensed consolidated balance sheet as of December 31, 2021 has been derived from our audited financial statements, which are included in our 2021 Annual Report on Form 10-K for the year ended December 31, 2021 on file with the SEC (the “2021 Annual Report”). These financial statements have been prepared on the same basis as our annual financial statements and, in management’s opinion, reflect all adjustments consisting only of normal recurring adjustments that are necessary for a fair presentation of our financial information. Our interim period operating results do not necessarily indicate the results that may be expected for any other interim period or for the full fiscal year. These financial statements and accompanying notes should be read in conjunction with the financial statements and accompanying notes thereto in the 2021 Annual Report.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Those estimates and assumptions affect revenue recognition and deferred revenue, the allowance for doubtful accounts, the sales return reserve, the valuation of inventory, the fair value of marketable securities, contingencies and litigation, accrued liabilities, deferred commissions and the determination of fair value of stock-based compensation. These estimates are based on information available as of the date of the condensed consolidated financial statements.
Concentration of Credit Risk and Significant Customers	Concentration of Credit Risk and Significant Customers Financial instruments that potentially subject us to concentrations of credit risk consist of cash, cash equivalents, marketable securities and accounts receivable. Our cash, cash equivalents and marketable securities are held and invested in high-credit quality financial instruments by recognized financial institutions and are subject to minimum credit risk. Our accounts receivable are unsecured and represent amounts due to us based on contractual obligations of our customers. We mitigate credit risk in respect to accounts receivable by performing periodic credit evaluations based on a number of factors, including past transaction experience, evaluation of credit history and review of the invoicing terms of the contract. We generally do not require our customers to provide collateral to support accounts receivable. Significant customers, including distribution channel partners and direct customers, are those which represent 10% or more of our total revenue for each period presented or our gross accounts receivable balance as of each respective balance sheet date.
Recently Adopted Accounting Guidance/Recent Accounting Pronouncements Not Yet Effective	Recently Adopted Accounting Pronouncements Effective January 1, 2020, the Company adopted Accounting Standards Update (“ASU”) No. 2016-13, Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”), as amended, using a modified retrospective approach, with certain exceptions allowed. The standard amends the guidance for measuring and recording credit losses on financial assets measured at amortized cost by replacing the incurred-loss model with an expected-loss model. This new standard also requires that credit losses related to available-for-sale debt securities be recorded as an allowance through net income rather than by reducing the carrying amount under the current, other-than-temporary-impairment model. The adoption of ASU 2016-13 did not have a significant impact on the Company’s condensed consolidated financial statements. In January 2017, the Financial Accounting Standards Board (“FASB”) issued ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). ASU 2017-04 simplifies the accounting for goodwill impairments by eliminating the requirement to compare the implied fair value of goodwill with its carrying amount as part of step two of the goodwill impairment test referenced in ASC 350, Intangibles – Goodwill and Other . As a result, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value. However, the impairment loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. In January 2020, the Company adopted ASU 2017-04, and the adoption did not have a significant impact on the Company’s condensed consolidated financial statements. Effective January 1, 2020, the Company adopted ASU No. 2018-13, Fair Value Measurement (Topic 820 – Changes to the Disclosure Requirements for the Fair Value Measurement) (“ASU 2018-13”). Under ASU 2018-13, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but public companies will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. The adoption of ASU 2018-13 did not have a significant impact on the Company’s condensed consolidated financial statements. In November 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes . The amendments in this update improve consistent application of and simplify U.S. GAAP for Topic 740 by clarifying and amending existing guidance for, among other items, intra-period allocation, reporting tax law changes and losses in interim periods, state and local taxes not fully based on income and recognition of deferred tax liability related to certain transactions. There is also new guidance related to consolidated group reporting and tax impacts resulting from business combinations. The Company adopted this guidance effective January 1, 2021 and the adoption of this guidance did not have a significant impact on the Company’s condensed consolidated financial statements. In October 2020, the FASB issued ASU No. 2020-10, Codification Improvements . The amendments in this ASU improve the consistency of the codification and reorganize the guidance into appropriate sections providing less opportunities for disclosures to be missed. The amendments in this update do not change U.S. GAAP and are not expected to result in a significant change in practice. The Company adopted this guidance on January 1, 2021 and the adoption of this guidance did not have a significant impact on the Company’s condensed consolidated financial statements.
Deferred Contract Acquisition Costs	Deferred Contract Acquisition Costs We capitalize certain contract acquisition costs consisting of incremental sales commissions incurred to obtain customer contracts. Deferred commissions related to product revenues are recognized upon transfer of control to customers. Deferred commissions related to services revenue are recognized as the related performance obligations are met. Deferred commissions that will be recognized during the succeeding 12-month period are recorded as prepaid expenses and other current assets, and the remaining portion is recorded as other non-current assets. Amortization of deferred commissions is included in sales and marketing expense.

Description of Business and S_3

Description of Business and Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Revenue as Percentage of Total Revenue	Three Months Ended March 31, Customers 2022 2021 Customer A (an end-customer) 17% * Customer B (a distribution channel partner) 11% 12% Customer C (a distribution channel partner) * 10% * represents less than 10% of total revenue

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2022
Leases [Abstract]
Assets And Liabilities,	The table below presents the Company’s right-of-use assets and lease liabilities as of March 31, 2022 (in thousands): March 31, 2022 Operating leases Right-of-use assets: Other non-current assets $ 22,347 Total right-of-use assets $ 22,347 Lease liabilities: Accrued liabilities $ 3,906 Other non-current liabilities 18,898 Total operating lease liabilities $ 22,804
Lease Payments	The aggregate future lease payments for non-cancelable operating leases as of March 31, 2022 were as follows (in thousands): Remainder of 2022 $ 3,416 2023 4,559 2024 4,667 2025 4,778 2026 4,892 Thereafter 2,414 Total lease payments 24,726 Less: imputed interest (1,922) Present value of lease liabilities $ 22,804
Lease Costs	Three Months Ended March 31, 2022 2021 Operating lease costs $ 1,071 $ 1,373 Short-term lease costs 130 147 Total lease costs $ 1,201 $ 1,520 Average lease terms and discount rates for the Company’s operating leases were as follows: March 31, 2022 Weighted-average remaining term (years) 5.30 Weighted-average discount rate 3.17% Supplemental cash flow information for the Company’s operating leases were as follows (in thousands): Three Months Ended March 31, 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,290 Right-of-use assets obtained in exchange for new lease liabilities $ 672

Marketable Securities and Fai_2

Marketable Securities and Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2022
Fair Value Disclosures [Abstract]
Available-for-sale Securities	Marketable securities, classified as available-for-sale, consisted of the following (in thousands): March 31, 2022 December 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Corporate securities $ 50,263 $ — $ (699) $ 49,564 $ 62,588 $ 1 $ (168) $ 62,421 U.S. Treasury and agency securities 19,906 — (278) 19,628 13,904 — (59) 13,845 Commercial paper 22,083 — — 22,083 23,570 — — 23,570 Asset-backed securities 5,698 — (28) 5,670 6,285 — (4) 6,281 Total $ 97,950 $ — $ (1,005) $ 96,945 $ 106,347 $ 1 $ (231) $ 106,117
Schedule of Cost and Estimated Fair Values of Available-for-sale Securities by Contractual Maturity	The following table summarizes the cost and estimated fair value of marketable securities based on stated effective maturities as of March 31, 2022 (in thousands): Amortized Cost Fair Value Less than 1 year $ 62,717 $ 62,429 Mature in 1 - 3 years 35,233 34,516 Total $ 97,950 $ 96,945
Schedule of gross unrealized losses	Marketable securities in an unrealized loss position as of March 31, 2022 consisted of the following (in thousands): Less Than 12 Months 12 Months or More Total As of March 31, 2022 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Corporate securities $ 47,549 $ (699) $ — $ — $ 47,549 $ (699) U.S. Treasury and agency securities 19,628 (278) — — 19,628 (278) Asset-backed securities 5,670 (28) — — 5,670 (28) $ 72,847 $ (1,005) $ — $ — $ 72,847 $ (1,005) Marketable securities in an unrealized loss position as of December 31, 2021 consisted of the following (in thousands): Less Than 12 Months 12 Months or More Total As of December 31, 2021 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Corporate securities $ 62,012 $ (168) $ — $ — $ 62,012 $ (168) U.S. Treasury and agency securities 13,845 (59) — — 13,845 (59) Asset-backed securities 6,281 (4) — — 6,281 (4) $ 82,138 $ (231) $ — $ — $ 82,138 $ (231)
Schedule of Cash, Cash Equivalents and Available-for-sale Investments Measured at Fair Value on Recurring Basis	The following is a summary of our cash, cash equivalents and marketable securities measured at fair value on a recurring basis (in thousands): March 31, 2022 December 31, 2021 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Cash $ 42,238 $ — $ — $ 42,238 $ 62,021 $ — $ — $ 62,021 Cash equivalents 25,520 — — 25,520 16,904 — — 16,904 Corporate securities — 49,564 — 49,564 — 62,421 — 62,421 U.S. Treasury and agency securities — 19,628 — 19,628 — 13,845 — 13,845 Commercial paper — 22,083 — 22,083 — 23,570 — 23,570 Asset-backed securities — 5,670 — 5,670 — 6,281 — 6,281 Total $ 67,758 $ 96,945 $ — $ 164,703 $ 78,925 $ 106,117 $ — $ 185,042

Condensed Consolidated Financ_2

Condensed Consolidated Financial Statement Details (Tables)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Property, Plant and Equipment [Abstract]
Schedule of Inventory	Inventory consisted of the following (in thousands): March 31, December 31, Raw materials $ 9,876 $ 10,774 Finished goods 10,956 11,688 Total inventory $ 20,832 $ 22,462
Prepaid Expenses and Other Current Assets		Prepaid expenses and other current assets consisted of the following (in thousands): March 31, December 31, Prepaid expenses $ 4,735 $ 4,326 Deferred contract acquisition costs 8,589 7,399 Other 4,092 2,995 Total prepaid expenses and other current assets $ 17,416 $ 14,720
Schedule of Property and Equipment, Net	Property and equipment, net, consisted of the following (in thousands): Useful Life March 31, December 31, (in years) Equipment 1 - 5 $ 27,087 $ 25,407 Software 1 - 3 840 807 Furniture and fixtures 1 - 7 545 545 Leasehold improvements Lease term 3,236 3,231 Construction in process 6,169 4,823 Property and equipment, gross 37,877 34,813 Less: accumulated depreciation (24,417) (24,121) Property and equipment, net $ 13,460 $ 10,692
Schedule of Accrued Liabilities	Accrued liabilities consisted of the following (in thousands): March 31, December 31, Accrued compensation and benefits $ 15,635 $ 24,003 Accrued tax liabilities 3,118 1,020 Lease liability 3,906 3,983 Other 7,554 7,095 Total accrued liabilities $ 30,213 $ 36,101
Schedule of Deferred Revenue	Deferred revenue consisted of the following (in thousands): March 31, December 31, Deferred revenue: Products $ 6,259 $ 6,164 Services 115,090 115,467 Total deferred revenue 121,349 121,631 Less: current portion (74,125) (73,132) Non-current portion $ 47,224 $ 48,499 The following table reflects contract balances with customers (in thousands): March 31, December 31, 2021 Accounts receivable, net $ 49,282 $ 61,795 Deferred revenue, current 74,125 73,132 Deferred revenue, non-current 47,224 48,499

Equity Incentive Plans and St_2

Equity Incentive Plans and Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2022
Share-based Payment Arrangement [Abstract]
Summary of Stock-based Compensation	A summary of our stock-based compensation expense is as follows (in thousands): Three Months Ended March 31, 2022 2021 Stock-based compensation by type of award: Stock awards $ 3,100 $ 4,123 Employee stock purchase rights 352 276 $ 3,452 $ 4,399 Stock-based compensation by category of expense: Cost of revenue $ 399 $ 572 Sales and marketing 1,099 1,264 Research and development 788 1,431 General and administrative 1,166 1,132 $ 3,452 $ 4,399
Summary of Activity under Stock Option Plans	The following table summarizes our stock option activities and related information: Number of Shares (thousands) Weighted-Average Exercise Price Per Share Weighted-Average Remaining Contractual Term Aggregate Intrinsic Value (thousands) Outstanding as of December 31, 2021 871 $ 6.13 Granted — — Exercised (35) 5.68 Canceled — — Outstanding as of March 31, 2022 836 6.15 2.14 $ 6,523 Vested and exercisable as of March 31, 2022 836 $ 6.15 2.14 $ 6,523
Summary of Restricted Stock Units Activity	The following table summarizes our stock award activities and related information: Number of Shares (thousands) Weighted-Average Grant Date Fair Value Per Share Weighted-Average Remaining Vesting Term Aggregate Fair Value (thousands) Nonvested as of December 31, 2021 3,717 $ 8.56 Granted 496 12.44 Released (365) 6.47 Canceled (117) 8.44 Nonvested as of March 31, 2022 3,731 $ 9.28 1.48 $ 52,040

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	3 Months Ended
	Mar. 31, 2022
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Basic and diluted net income per share are calculated as follows (in thousands, except per share amounts): Three Months Ended March 31, 2022 2021 Basic and diluted net income per share Numerator: Net income $ 6,349 $ 2,657 Denominator: Weighted-average shares outstanding - basic 76,795 76,704 Effect of dilutive potential common shares from stock options, stock awards and employee stock purchase plan 2,490 2,932 Weighted-average shares outstanding - diluted 79,285 79,636 Net income per share: Basic $ 0.08 $ 0.03 Diluted $ 0.08 $ 0.03
Summary of Anti-dilutive Shares	The following table presents common shares related to potentially dilutive shares excluded from the calculation of diluted net income (loss) per share as their effect would have been anti-dilutive (in thousands): Three Months Ended March 31, 2022 2021 Stock options, restricted stock units and employee stock purchase rights 233 67

Geographic Information (Tables)

Geographic Information (Tables)	3 Months Ended
	Mar. 31, 2022
Segment Reporting [Abstract]
Schedule of Total Revenue Based on Customer's Location	The following table depicts the disaggregation of revenue by geographic region based on the ship to location of our customers and is consistent with how we evaluate our financial performance (in thousands): Three Months Ended March 31, 2022 2021 Americas $ 32,958 $ 26,270 Asia Pacific 17,789 19,954 EMEA 11,925 8,619 Total revenue $ 62,672 $ 54,843
Long-lived Assets by Geographic Areas	The following table is a summary of our long-lived assets which include property and equipment, net and operating lease right-of-use assets based on the physical location of the assets (in thousands): March 31, December 31, United States $ 34,671 $ 32,255 Japan 161 422 India 599 513 Other 376 368 Total $ 35,807 $ 33,558

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2022
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset and Liability	Deferred revenue consisted of the following (in thousands): March 31, December 31, Deferred revenue: Products $ 6,259 $ 6,164 Services 115,090 115,467 Total deferred revenue 121,349 121,631 Less: current portion (74,125) (73,132) Non-current portion $ 47,224 $ 48,499 The following table reflects contract balances with customers (in thousands): March 31, December 31, 2021 Accounts receivable, net $ 49,282 $ 61,795 Deferred revenue, current 74,125 73,132 Deferred revenue, non-current 47,224 48,499
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	We expect to recognize revenue on the remaining performance obligations as follows (in thousands): March 31, 2022 Within 1 year $ 74,125 Next 2 to 3 years 37,615 Thereafter 9,609 Total $ 121,349

Description of Business and S_4

Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2021	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
ROU asset	$ 22,347
Present value of lease liabilities	$ 22,804
Treasury Stock, Shares, Acquired	2,100,000		2,600,000
Treasury Stock, Shares	9,416,000			7,294,000
Treasury Stock, Value, Acquired, Cost Method	$ 28,300		$ 35,400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	0
Treasury Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Treasury Stock, Shares, Acquired	2,122,000	9,000

Description of Business and S_5

Description of Business and Summary of Significant Accounting Policies - Concentration Risk (Details) - Customer Concentration Risk	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Customer A | Revenue
Entity Wide Revenue Major Customer [Line Items]
Percentage representation of significant customers (percent)	17.00%
Customer A | Accounts Receivable
Entity Wide Revenue Major Customer [Line Items]
Percentage representation of significant customers (percent)	21.00%		14.00%
Customer B | Revenue
Entity Wide Revenue Major Customer [Line Items]
Percentage representation of significant customers (percent)	11.00%	12.00%
Customer B | Accounts Receivable
Entity Wide Revenue Major Customer [Line Items]
Percentage representation of significant customers (percent)	12.00%		11.00%
Customer C | Revenue
Entity Wide Revenue Major Customer [Line Items]
Percentage representation of significant customers (percent)		10.00%
Customer C | Accounts Receivable
Entity Wide Revenue Major Customer [Line Items]
Percentage representation of significant customers (percent)	10.00%

Leases - Assets and Liabilities

Leases - Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Total right-of-use assets	$ 22,347
Accrued liabilities	3,906	$ 3,983
Other non-current liabilities	18,898
Total operating lease liabilities	$ 22,804

Leases - Lease Liabilities (Det

Leases - Lease Liabilities (Details) $ in Thousands	Mar. 31, 2022USD ($)
Leases [Abstract]
Remainder of 2022	$ 3,416
2021	4,559
2022	4,667
2023	4,778
2024	4,892
Thereafter	2,414
Total lease payments	24,726
Less: imputed interest	(1,922)
Present value of lease liabilities	$ 22,804

Leases - Lease Costs (Details)

Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Leases [Abstract]
Operating lease costs	$ 1,071	$ 1,373
Short-term lease costs	130	147
Total lease costs	$ 1,201	$ 1,520
Weighted-average remaining term (years)	5 years 3 months 18 days
Weighted-average discount rate	3.17%
Operating cash flows from operating leases	$ 1,290
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 672

Marketable Securities and Fai_3

Marketable Securities and Fair Value Measurements - Estimate of Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 97,950	$ 106,347
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(1,005)	(231)
Fair Value	96,945	106,117
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	50,263	62,588
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(699)	(168)
Fair Value	49,564	62,421
U.S. Treasury and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	19,906	13,904
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(278)	(59)
Fair Value	19,628	13,845
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	22,083	23,570
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	22,083	23,570
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,698	6,285
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(28)	(4)
Fair Value	$ 5,670	$ 6,281

Marketable Securities and Fai_4

Marketable Securities and Fair Value Measurements - Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost
Less than 1 year	$ 62,717
Mature in 1 - 3 years	35,233
Amortized Cost	97,950	$ 106,347
Fair Value
Less than 1 year	62,429
Mature in 1 - 3 years	34,516
Fair Value	$ 96,945	$ 106,117

Marketable Securities and Fai_5

Marketable Securities and Fair Value Measurements - Securities in Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less Than 12 Months	$ 72,847	$ 82,138
Fair Value, 12 Months or More	0	0
Fair Value, Total	72,847	82,138
Gross Unrealized Losses, Less Than 12 Months	(1,005)	(231)
Gross Unrealized Losses,12 Months or More	0	0
Gross Unrealized Losses	(1,005)	(231)
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less Than 12 Months	47,549	62,012
Fair Value, 12 Months or More	0	0
Fair Value, Total	47,549	62,012
Gross Unrealized Losses, Less Than 12 Months	(699)	(168)
Gross Unrealized Losses,12 Months or More	0	0
Gross Unrealized Losses	(699)	(168)
U.S. Treasury and agency securities
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less Than 12 Months	19,628	13,845
Fair Value, 12 Months or More	0	0
Fair Value, Total	19,628	13,845
Gross Unrealized Losses, Less Than 12 Months	(278)	(59)
Gross Unrealized Losses,12 Months or More	0	0
Gross Unrealized Losses	(278)	(59)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less Than 12 Months	5,670	6,281
Fair Value, 12 Months or More	0	0
Fair Value, Total	5,670	6,281
Gross Unrealized Losses, Less Than 12 Months	(28)	(4)
Gross Unrealized Losses,12 Months or More	0	0
Gross Unrealized Losses	$ (28)	$ (4)

Marketable Securities and Fai_6

Marketable Securities and Fair Value Measurements - Schedule of Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financial Assets
Marketable Securities	$ 96,945	$ 106,117
Level 1
Financial Assets
Total	67,758	78,925
Level 2
Financial Assets
Total	96,945	106,117
Fair Value, Inputs, Level 1, 2 and 3
Financial Assets
Total	164,703	185,042
Cash
Financial Assets
Cash and Cash Equivalents	42,238	62,021
Cash | Level 1
Financial Assets
Cash and Cash Equivalents	42,238	62,021
Cash equivalents
Financial Assets
Cash and Cash Equivalents	25,520	16,904
Cash equivalents | Level 1
Financial Assets
Cash and Cash Equivalents	25,520	16,904
Corporate securities
Financial Assets
Marketable Securities	49,564	62,421
Corporate securities | Level 2
Financial Assets
Marketable Securities	49,564	62,421
U.S. Treasury and agency securities
Financial Assets
Marketable Securities	19,628	13,845
U.S. Treasury and agency securities | Level 2
Financial Assets
Marketable Securities	19,628	13,845
Commercial paper
Financial Assets
Marketable Securities	22,083	23,570
Commercial paper | Level 2
Financial Assets
Marketable Securities	22,083	23,570
Asset-backed securities
Financial Assets
Marketable Securities	5,670	6,281
Asset-backed securities | Level 2
Financial Assets
Marketable Securities	$ 5,670	$ 6,281

Condensed Consolidated Financ_3

Condensed Consolidated Financial Statement Details - Schedule of Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 9,876	$ 10,774
Finished goods	10,956	11,688
Total inventory	$ 20,832	$ 22,462

Condensed Consolidated Financ_4

Condensed Consolidated Financial Statement Details - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Prepaid expenses	$ 4,735	$ 4,326
Deferred contract acquisition costs	8,589	7,399
Other	4,092	2,995
Total prepaid expenses and other current assets	$ 17,416	$ 14,720

Condensed Consolidated Financ_5

Condensed Consolidated Financial Statement Details - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 37,877	$ 34,813
Less: accumulated depreciation	(24,417)	(24,121)
Property and equipment, net	13,460	10,692
Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	27,087	25,407
Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	840	807
Furniture and fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	545	545
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	3,236	3,231
Construction in process
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 6,169	$ 4,823
Minimum | Equipment
Property Plant And Equipment [Line Items]
Useful life	1 year
Minimum | Software
Property Plant And Equipment [Line Items]
Useful life	1 year
Minimum | Furniture and fixtures
Property Plant And Equipment [Line Items]
Useful life	1 year
Maximum | Equipment
Property Plant And Equipment [Line Items]
Useful life	5 years
Maximum | Software
Property Plant And Equipment [Line Items]
Useful life	3 years
Maximum | Furniture and fixtures
Property Plant And Equipment [Line Items]
Useful life	7 years

Condensed Consolidated Financ_6

Condensed Consolidated Financial Statement Details - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 0.7	$ 0.7
Amortization expense related to intangible assets		$ 0.4

Condensed Consolidated Financ_7

Condensed Consolidated Financial Statement Details - Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accrued Liabilities, Current [Abstract]
Accrued compensation and benefits	$ 15,635	$ 24,003
Accrued tax liabilities	3,118	1,020
Lease liability	3,906	3,983
Other	7,554	7,095
Total accrued liabilities	$ 30,213	$ 36,101

Condensed Consolidated Financ_8

Condensed Consolidated Financial Statement Details - Schedule of Deferred Revenue (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 121,349	$ 121,631
Less: current portion	(74,125)	(73,132)
Non-current portion	47,224	48,499
Products
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	6,259	6,164
Services
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 115,090	$ 115,467

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 1.2	$ 1.4
Remaining purchase commitments	$ 34.9

Equity Incentive Plans and St_3

Equity Incentive Plans and Stock-Based Compensation - 2014 Equity Incentive Plan/ESPP (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 10, 2015	Oct. 31, 2018	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised				$ 0.3	$ 1.5
2014 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future grant (in shares)				9,870,741
2014 Stock Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of outstanding shares of common stock		5.00%
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease)		8,000,000
2014 Employee Stock Purchase Plan | ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of eligible compensation	15.00%
Offering period	24 months
Amended 2014 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future grant (in shares)				1,386,639
Amended 2014 Employee Stock Purchase Plan | ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of eligible compensation			10.00%
Offering period			6 months

Equity Incentive Plans and St_4

Equity Incentive Plans and Stock-Based Compensation - Schedule of Stock-based Compensation Awards Granted under Stock Option Plan in Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 3,452	$ 4,399
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	399	572
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	1,099	1,264
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	788	1,431
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	1,166	1,132
Stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	3,100	4,123
Employee stock purchase rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 352	$ 276

Equity Incentive Plans and St_5

Equity Incentive Plans and Stock-Based Compensation - Stock-based Compensation/Stock Repurchase Program (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022USD ($)
Share-based Payment Arrangement [Abstract]
Total compensation expense related to unvested awards granted, not yet recognized	$ 25.5
Total compensation expense related to unvested awards granted, not yet recognized weighted-average period for recognition (in years)	2 years 7 days

Equity Incentive Plans and St_6

Equity Incentive Plans and Stock-Based Compensation - Summary of Activity under Stock Option Plans (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Number of Shares (thousands)
Outstanding options, Beginning balance (in shares)	871
Granted (in shares)	0
Exercised (in shares)	(35)
Canceled (in shares)	0
Outstanding options, Ending balance (in shares)	836
Vested and exercisable (in shares)	836
Weighted-Average Exercise Price Per Share
Beginning balance (in dollars per share)	$ 6.13
Granted (in dollars per share)	0
Exercised (in dollars per share)	5.68
Canceled (in dollars per share)	0
Ending balance (in dollars per share)	6.15
Vested and exercisable at end of period (in dollars per share)	$ 6.15
Weighted-average remaining contractual term (in years)	2 years 1 month 20 days
Weighted average remaining contractual term, Vested and exercisable at end of period (in years)	2 years 1 month 20 days
Aggregate Intrinsic Value	$ 6,523
Aggregate Intrinsic Value, Vested and exercisable at end of period	$ 6,523
Closing price (in dollars per share)	$ 13.95
Intrinsic value of options exercised	$ 300	$ 1,500

Equity Incentive Plans and St_7

Equity Incentive Plans and Stock-Based Compensation - Information About Stock Options (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 0.3	$ 1.5

Equity Incentive Plans and St_8

Equity Incentive Plans and Stock-Based Compensation - Summary of RSU activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested at end of period (in shares)	3,731,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested	$ 52,040
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested at beginning of period (in shares)	3,717,000
Granted (in shares)	496,000
Released (in shares)	(365,000)
Canceled (in shares)	(117,000)
Unvested at end of period (in shares)	2,709,481
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested at beginning of period (in dollars per share)	$ 8.56
Granted (in dollars per share)	12.44
Released (in dollars per share)	6.47
Canceled (in dollars per share)	8.44
Unvested at ending of period (in dollars per share)	$ 9.28
Weighted-Average Remaining Vesting Term (years)	1 year 5 months 23 days
Fair value of released awards	$ 2,400	$ 4,000
Performance Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested at end of period (in shares)	1,021,009

Equity Incentive Plans and St_9

Equity Incentive Plans and Stock-Based Compensation (Details) - Stock Repurchase Program - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Oct. 28, 2021	Sep. 17, 2020
Share-based Payment Arrangement [Abstract]
Treasury Stock, Shares	9,416,000		7,294,000
Stock Repurchase Program, Authorized Amount				$ 100,000	$ 50,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 64,600
Treasury Stock, Value, Acquired, Cost Method	$ 28,300	$ 35,400
Treasury Stock, Shares, Acquired	2,100,000	2,600,000

Net Loss Per Share - Summary of

Net Loss Per Share - Summary of Outstanding Shares of Common Stock Equivalents (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share Diluted [Line Items]
Net income	$ 6,349	$ 2,657
Weighted-average shares outstanding - basic (in shares)	76,795	76,704
Weighted Average Number Diluted Shares Outstanding Adjustment	2,490	2,932
Weighted-average shares outstanding - diluted (in shares)	79,285	79,636
Basic	$ 0.08	$ 0.03
Diluted	$ 0.08	$ 0.03
Stock options, restricted stock units and employee stock purchase rights
Earnings Per Share Diluted [Line Items]
Anti-dilutive securities excluded from computation of diluted net income per share	233	67

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income tax expense	$ 1,140	$ 184
Unrecognized tax benefits	$ 6,500

Geographic Information - Schedu

Geographic Information - Schedule of Total Revenue Based on Customer's Location (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Total revenue	$ 62,672	$ 54,843
Americas
Segment Reporting Information [Line Items]
Total revenue	32,958	26,270
Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	17,789	19,954
EMEA
Segment Reporting Information [Line Items]
Total revenue	$ 11,925	$ 8,619

Geographic Information - Long L

Geographic Information - Long Lived Assets By Geographic Area (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 35,807	$ 33,558
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	34,671	32,255
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	161	422
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	599	513
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 376	$ 368

Revenue - Additional Informatio

Revenue - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accumulated deficit	$ 171,013,000		$ 177,362,000
Deferred revenue	121,349,000		121,631,000
Revenue recognized	24,600,000	$ 23,100,000
Asset impairment charges for contract assets	0
Deferred contract acquisition costs	8,589,000		7,399,000
Deferred Sales Commissions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred contract acquisition costs	4,100,000		4,500,000
Amortization	2,000,000	$ 1,700,000
Impairment loss of contract acquisition costs	0
Deferred contract acquisition costs	$ 8,600,000		$ 7,400,000

Revenue - Contract Balances (De

Revenue - Contract Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 49,282	$ 61,795
Deferred revenue	74,125	73,132
Deferred revenue, non-current	47,224	48,499
Deferred contract acquisition costs	$ 8,589	$ 7,399

Revenue - Remaining Performance

Revenue - Remaining Performance Obligations (Details) $ in Thousands	Mar. 31, 2022USD ($)
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 121,349
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 74,125
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 37,615
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 9,609
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation period	4 years

Subsequent Event Subsequent Eve

Subsequent Event Subsequent Events (Details) - Subsequent event - $ / shares	Jun. 01, 2022	May 16, 2022	May 03, 2022
Subsequent Event [Line Items]
Dividends Payable, Date Declared			May 3, 2022
Common Stock, Dividends, Per Share, Declared	$ 0.05
Dividends Payable, Date to be Paid	Jun. 1, 2022
Dividends Payable, Date of Record		May 16, 2022