Fastly (FSLY) 10-K 21 Feb 24 2023 FY Annual report Financial data

Cover Page

Cover Page - USD ($) shares in Millions, $ in Billions	12 Months Ended
	Dec. 31, 2023	Feb. 16, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-38897
Entity Registrant Name	FASTLY, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-5411834
Entity Address, Address Line One	475 Brannan Street, Suite 300
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94107
City Area Code	844
Local Phone Number	432-7859
Title of 12(b) Security	Class A Common Stock, $0.00002 par value
Trading Symbol	FSLY
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
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
Document Financial Statement Error Correction Flag	false
Entity Shell Company	false
Entity Public Float			$ 2
Entity Common Stock, Shares Outstanding		134.2
Documents Incorporated by Reference	Portions of the registrant’s Definitive Proxy Statement relating to the 2024 Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Such Definitive Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s fiscal year ended December 31, 2023.
Entity Central Index Key	0001517413
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2023
Audit Information [Abstract]
Auditor Name	Deloitte & Touche LLP
Auditor Location	San Francisco, California
Auditor Firm ID	34

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 107,921	$ 143,391
Marketable securities, current	214,799	374,581
Accounts receivable, net of allowance for credit losses of $7,054 and $5,029 as of December 31, 2023 and December 31, 2022, respectively	120,498	89,578
Prepaid expenses and other current assets	20,455	28,933
Total current assets	463,673	636,483
Property and equipment, net	176,608	180,378
Operating lease right-of-use assets, net	55,212	68,440
Goodwill	670,356	670,185
Intangible assets, net	62,475	82,900
Marketable securities, non-current	6,088	165,105
Other assets	90,779	92,622
Total assets	1,525,191	1,896,113
Current liabilities:
Accounts payable	5,611	4,786
Accrued expenses	61,818	61,161
Finance lease liabilities, current	15,684	28,954
Operating lease liabilities, current	24,042	23,026
Other current liabilities	40,539	34,394
Total current liabilities	147,694	152,321
Long-term debt	343,507	704,710
Finance lease liabilities, non-current	1,602	15,507
Operating lease liabilities, non-current	48,484	61,341
Other long-term liabilities	4,416	7,076
Total liabilities	545,703	940,955
Commitments and contingencies (Note 10)
Stockholders’ equity:
Class A Common stock, $0.00002 par value; 1,000,000,000 shares authorized as of both December 31, 2023 and 2022; 132,992,126 and 124,336,171 shares issued and outstanding at December 31, 2023 and 2022, respectively	3	2
Additional paid-in capital	1,815,245	1,666,106
Accumulated other comprehensive loss	(1,008)	(9,286)
Accumulated deficit	(834,752)	(701,664)
Total stockholders’ equity	979,488	955,158
Total liabilities and stockholders’ equity	$ 1,525,191	$ 1,896,113

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 7,054	$ 5,029	$ 3,311	$ 3,248
Common stock, par value (in dollars per share)	$ 0.00002	$ 0.00002
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	132,992,126	124,336,171
Common stock, shares outstanding (in shares)	132,992,126	124,336,171

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Revenue	$ 505,988,000	$ 432,725,000	$ 354,330,000
Cost of revenue	239,660,000	222,944,000	167,002,000
Gross profit	266,328,000	209,781,000	187,328,000
Operating expenses:
Research and development	152,190,000	155,308,000	126,859,000
Sales and marketing	191,773,000	179,869,000	152,645,000
General and administrative	116,077,000	120,803,000	126,845,000
Impairment expense	4,316,000	0	0
Total operating expenses	464,356,000	455,980,000	406,349,000
Loss from operations	(198,028,000)	(246,199,000)	(219,021,000)
Net gain on extinguishment of debt	52,416,000	54,391,000	0
Interest income	18,186,000	7,044,000	1,282,000
Interest expense	(4,051,000)	(5,887,000)	(5,245,000)
Other income (expense), net	(1,832,000)	(29,000)	356,000
Loss before income taxes	(133,309,000)	(190,680,000)	(222,628,000)
Income tax expense (benefit)	(221,000)	94,000	69,000
Net loss	$ (133,088,000)	$ (190,774,000)	$ (222,697,000)
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (1.03)	$ (1.57)	$ (1.92)
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (1.03)	$ (1.57)	$ (1.92)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	128,770	121,723	116,053
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	128,770	121,723	116,053

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Other Comprehensive Income [Abstract]
Net loss	$ (133,088)	$ (190,774)	$ (222,697)
Other comprehensive loss:
Foreign currency translation adjustment	565	(255)	(286)
Gain (loss) on investments in available-for-sale-securities	7,713	(6,404)	(2,347)
Total other comprehensive gain (loss)	8,278	(6,659)	(2,633)
Comprehensive loss	$ (124,810)	$ (197,433)	$ (225,330)

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Class A	Common Class B	Common Stock Common Class A	Common Stock Common Class A RSUs	Common Stock Common Class A RSAs	Common Stock Common Class B	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020				103,394,000			10,229,000
Beginning balance at Dec. 31, 2020	$ 1,061,865			$ 1			$ 1	$ 1,350,050	$ 6	$ (288,193)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)				2,188,000
Exercise of vested stock options	12,626							12,626
Vesting of early exercised stock options (in shares)				48,000			43,000
Vesting of early exercised stock options	405							405
Vesting of restricted stock (in shares)					2,000,000	448,000
Proceeds from sale of restricted shares (in shares)				224,000
Proceeds from sale of restricted shares	10,655							10,655
Shares issued under employee stock purchase program (in shares)				236,000
Shares issued under employee stock purchase program	8,798							8,798
Stock-based compensation	144,934							144,934
Conversion of Class B to Class A Stock (in shares)				10,272,000			(10,272,000)
Conversion of Class B common stock to Class A common stock	0			$ 1			$ (1)
Net loss	(222,697)									(222,697)
Other comprehensive income (loss)	(2,633)								(2,633)
Ending balance (in shares) at Dec. 31, 2021				118,811,000			0
Ending balance at Dec. 31, 2021	1,013,953			$ 2			$ 0	1,527,468	(2,627)	(510,890)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)				1,778,000
Exercise of vested stock options	5,688							5,688
Vesting of restricted stock (in shares)					3,119,000	112,000
Shares issued under employee stock purchase program (in shares)				516,000
Shares issued under employee stock purchase program	4,665							4,665
Stock-based compensation	128,285							128,285
Net loss	(190,774)									(190,774)
Other comprehensive income (loss)	$ (6,659)								(6,659)
Ending balance (in shares) at Dec. 31, 2022	124,336,171	124,300,000		124,336,000			0
Ending balance at Dec. 31, 2022	$ 955,158			$ 2			$ 0	1,666,106	(9,286)	(701,664)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	291,000			291,000
Exercise of vested stock options	$ 2,169							2,169
Vesting of restricted stock (in shares)					6,150,000
Vesting of restricted stock units	1				$ 1
Shares issued under bonus program (in shares)				1,193,000
Shares issued under bonus program	16,599							16,599
Shares issued under employee stock purchase program (in shares)				1,022,000
Shares issued under employee stock purchase program	8,692							8,692
Stock-based compensation	121,679							121,679
Net loss	(133,088)									(133,088)
Other comprehensive income (loss)	$ 8,278								8,278
Ending balance (in shares) at Dec. 31, 2023	132,992,126	133,000,000	0	132,992,000			0
Ending balance at Dec. 31, 2023	$ 979,488			$ 3			$ 0	$ 1,815,245	$ (1,008)	$ (834,752)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net loss	$ (133,088,000)	$ (190,774,000)	$ (222,697,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	51,602,000	42,619,000	28,799,000
Amortization of intangible assets	20,424,000	21,696,000	21,238,000
Non-cash lease expense	22,678,000	25,448,000	23,065,000
Amortization of debt discount and issuance costs	2,476,000	3,169,000	3,185,000
Amortization of deferred contract costs	15,548,000	8,916,000	6,294,000
Stock-based compensation	136,303,000	145,796,000	140,488,000
Deferred income taxes	(900,000)	0	0
Provision for credit losses	2,025,000	2,406,000	196,000
(Gain) loss on disposals of property and equipment	505,000	854,000	(300,000)
Amortization and accretion of discounts and premiums on investments	(646,000)	3,137,000	2,221,000
Impairment of operating lease right-of-use assets	744,000	2,083,000	0
Impairment expense	4,316,000	0	0
Net gain on extinguishment of debt	(52,416,000)	(54,391,000)	0
Other adjustments	648,000	3,688,000	4,000
Changes in operating assets and liabilities:
Accounts receivable	(32,945,000)	(27,359,000)	(14,563,000)
Prepaid expenses and other current assets	8,709,000	(6,758,000)	(4,777,000)
Other assets	(23,137,000)	(35,396,000)	(10,423,000)
Accounts payable	382,000	(4,724,000)	146,000
Accrued expenses	(7,856,000)	8,289,000	4,261,000
Operating lease liabilities	(22,074,000)	(22,778,000)	(22,629,000)
Other liabilities	7,064,000	4,447,000	7,010,000
Net cash (used in) provided by operating activities	362,000	(69,632,000)	(38,482,000)
Cash flows from investing activities:
Purchases of marketable securities	(132,233,000)	(355,479,000)	(928,155,000)
Sales of marketable securities	25,625,000	161,918,000	66,527,000
Maturities of marketable securities	433,767,000	535,040,000	118,085,000
Business acquisitions, net of cash acquired	0	(25,902,000)	(1,169,000)
Advance payment for purchase of property and equipment	0	(42,197,000)	0
Purchases of property and equipment	(10,976,000)	(19,975,000)	(34,816,000)
Proceeds from sale of property and equipment	49,000	492,000	588,000
Capitalized internal-use software	(21,292,000)	(18,146,000)	(13,479,000)
Purchases of intangible assets	0	0	(2,092,000)
Net cash (used in) provided by investing activities	294,940,000	235,751,000	(794,511,000)
Cash flows from financing activities:
Issuance of convertible note, net of issuance costs	0	0	930,775,000
Payments of debt issuance costs	0	0	(1,351,000)
Cash paid for debt extinguishment	(310,540,000)	(177,082,000)	0
Repayments of finance lease liabilities	(27,175,000)	(22,532,000)	(13,568,000)
Cash received for restricted stock sold in advance of vesting conditions	0	10,655,000	0
Cash paid for early sale of restricted shares	0	(10,655,000)	0
Payment of deferred consideration for business acquisitions	(4,393,000)	0	0
Proceeds from exercise of vested stock options	2,169,000	5,688,000	12,626,000
Proceeds from employee stock purchase plan	8,559,000	4,777,000	8,069,000
Net cash (used in) provided by financing activities	(331,380,000)	(189,149,000)	936,551,000
Effects of exchange rate changes on cash, cash equivalents, and restricted cash	608,000	(390,000)	(477,000)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(35,470,000)	(23,420,000)	103,081,000
Cash, cash equivalents, and restricted cash at beginning of period	143,541,000	166,961,000	63,880,000
Cash, cash equivalents, and restricted cash at end of period	108,071,000	143,541,000	166,961,000
Supplemental disclosure of cash flow information:
Cash paid for interest	1,574,000	2,656,000	1,938,000
Cash paid for income taxes, net of refunds received	331,000	250,000	267,000
Noncash investing and financing activities:
Property and equipment additions not yet paid in cash or financed	640,000	1,492,000	18,275,000
Vesting of early-exercised stock options	0	0	405,000
Stock-based compensation capitalized to internal-use software	9,975,000	7,997,000	4,446,000
Assets obtained in exchange for operating lease obligations	5,769,000	29,606,000	32,458,000
Assets obtained in exchange for finance lease obligations	0	23,575,000	31,529,000
Net non-cash change in operating lease assets and liabilities associated with modifications and terminations	(4,425,000)	3,126,000	0
Interest paid for finance leases	1,329,000	2,381,000	1,754,000
Purchase consideration associated with business combination, accrued but not paid	0	8,000,000	0
Deployments of prepaid capital equipment	8,665,000	5,184,000	0
Receivable related to shares of restricted stock	0	0	10,655,000
Reconciliation of cash, cash equivalents, and restricted cash as shown in the statements of cash flows
Cash and cash equivalents	107,921,000	143,391,000	166,068,000
Restricted cash	150,000	150,000	0
Restricted cash included in other assets	0	0	893,000
Total cash, cash equivalents, and restricted cash	$ 108,071,000	$ 143,541,000	$ 166,961,000

Nature of Business

Nature of Business	12 Months Ended
	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	Nature of Business Fastly, Inc. has built an edge cloud platform that can process, serve, and secure its customer’s applications as close to their end users as possible. As of December 31, 2023, the Company’s edge network spans across 79 markets around the world. The Company was incorporated in Delaware in 2011 and is headquartered in San Francisco, California. As used herein, “ Fastly,” “the Company,” “its” and similar terms include Fastly, Inc. and its subsidiaries, unless the context indicates otherwise. Conversion of Dual Class Common Stock Structure On July 12, 2021, all outstanding shares of Class B common stock automatically converted into the same number of shares of Class A common stock (the “Conversion”) pursuant to the terms of the Company’s amended and restated certificate of incorporation (the “Certificate”). Upon the Conversion, outstanding options denominated in shares of Class B common stock issued under any of the Company’s equity incentive plans remained unchanged, except that such options now represent the right to receive shares of Class A common stock on exercise. In accordance with the Certificate, the shares of Class B common stock that converted to Class A common stock were retired and will not be reissued by the Company.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation and Consolidation The accompanying consolidated financial statements and footnotes have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The accompanying consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. Certain changes to presentation have been made to conform the prior period presentation to the current period reporting. The Company has made certain presentation changes to consolidate the interest paid on finance lease line into other liabilities working capital changes and components of the non-cash lease expense related to operating lease liability changes into operating lease liability working capital changes within operating cash flows in the consolidated statements of cash flows. Such reclassifications did not affect the consolidated balance sheets, total revenues, operating income, net income, or cash flows from operating, investing or financing activities. Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates, judgments, and assumptions that affect the reported amounts of assets, liabilities, revenue, costs and expenses, and related disclosures. Actual results and outcomes could differ significantly from the Company’s estimates, judgments, and assumptions. Significant estimates, judgments, and assumptions used in these financial statements include, but are not limited to, those related to revenue, accounts receivable and related reserves, internal-use software development costs, the incremental borrowing rate related to the Company’s lease liabilities, fair value of assets acquired and liabilities assumed during business combinations, useful lives of acquired intangible assets and property and equipment, fair value of the Company’s long-lived assets as well as reporting unit, income tax reserves, and accounting for stock-based compensation. Estimates are periodically reviewed in light of changes in circumstances, facts, and experience. The effects of material revisions in estimates are reflected in the consolidated financial statements in the period of change and prospectively from the date of the change in estimate. Concentrations of Credit Risk Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash, cash equivalents, marketable securities and accounts receivable. The Company’s cash, cash equivalents, and marketable securities primarily consisted of bank deposits, money market funds, investment-grade commercial paper, corporate notes and bonds, U.S. treasury securities, agency bonds, municipal securities, foreign government and supranational securities and asset-backed securities held at major financial institutions that the Company believes to be of high credit standing. The primary focus of its investment strategy is to preserve capital and meet liquidity requirements. The Company’s investment policy limits the amount of credit exposure with any one financial institution or commercial issuer. The Company maintains deposits in federally insured financial institutions in excess of federally insured limits. The Company is exposed to credit risk in the event of default by the financial institutions holding its cash and cash equivalents to the extent recorded in the balance sheets. While the Company has not experienced any losses in such accounts and the Company has historically maintained its cash in multiple financial institutions, the failure of Silicon Valley Bank (“SVB”) in March 2023, at which the Company held cash and cash equivalents in multiple accounts, exposed the Company to limited credit risk prior to the completion by the Federal Deposit Insurance Corporation (“FDIC”) of the resolution of SVB in a manner that fully protected all depositors. Concentrations of credit risk with respect to accounts receivable are primarily limited to certain customers to which the Company makes substantial sales. The Company’s customer base consists of a large number of geographically dispersed customers diversified across several industries. No customer accounted for more than 10% of revenue for both the years ended December 31, 2023, 2022 and 2021. One customer accounted for more than 10% of the total accounts receivable balance as of December 31, 2023, whereas no customers accounted for more than 10% of the total accounts receivable balance as of December 31, 2022. Affiliated customers that are business units of a single company in the streaming entertainment space generated an aggregate of 12%, 11% and 11% of the Company’s revenue for the years ended December 31, 2023, 2022 and 2021, respectively. The same affiliated customers accounted for an aggregate of 23% and 15% of the Company’s accounts receivable balance as of December 31, 2023 and 2022, respectively. Cash, Cash Equivalents and Marketable Securities Cash and cash equivalents include cash held in banks, highly liquid money market funds, U.S. treasury securities and commercial paper, all with original maturities of three months or less when acquired. The Company’s short-term and long-term marketable securities consists of fixed income U.S. and foreign government agency securities, corporate bonds, agency bonds, asset-backed securities and commercial paper. Management determines the appropriate classification of the Company’s investments at the time of purchase and reevaluates such designation at each balance sheet date. The Company classifies its marketable securities as either short-term or long-term based on each instrument’s underlying remaining contractual maturity date. The Company classifies its marketable securities as available-for-sale as it has the ability to sell the marketable securities prior to its maturity. The Company’s marketable securities are reported at fair value with unrealized gains and losses reported, net of tax, as a separate component of accumulated other comprehensive income (loss) in stockholders’ equity. Cash and cash equivalents are stated at cost, which approximate fair market value. Short-term and long-term marketable securities are classified as available-for-sale debt securities and are also carried at fair market value. When the available-for-sale debt securities are sold, cost is based on the specific identification method, and the realized gains and losses are included in other income (expense), net in the consolidated statements of operations. The Company evaluates its investments periodically for possible other-than-temporary impairment. A decline in fair value below the amortized costs of its available-for-sale debt securities is considered an other-than-temporary impairment if the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of the entire amortized cost basis. Otherwise, the credit loss component of the impairment is recorded as allowance for credit losses with an offsetting entry charged to other income (expense), net, while the remaining loss is recognized in other comprehensive income (loss). Restricted Cash As of both December 31, 2023 and 2022, the Company had a restricted cash balance of $0.2 million, which consists of a letter of credit related to a lease arrangement that is collateralized by restricted cash. As of December 31, 2023 and 2022, these amounts are included in prepaid expenses and other current assets on the consolidated balance sheets. Accounts Receivable, net Accounts receivable are recorded and carried at the original invoiced amount, net of an allowance for any potential credit losses. The allowance for credit losses is determined based upon the assessment of various factors, such as historical experience, credit quality of its customers, age of the accounts receivable balances, geographic related risks, economic conditions, and other factors that may affect a customer’s ability to pay. The Company records these charges as a component of general and administrative expenses in the consolidated statements of operations in the period in which the change occurs. The Company does not have any off-balance sheet credit exposure related to its customers. Incremental Costs to Obtain a Contract with a Customer The Company capitalizes incremental costs associated with obtaining customer contracts, specifically certain commission payments. The Company pays commissions based on contract value upon signing a new arrangement with a customer and upon renewal and upgrades of existing contracts with customers only if the renewal and upgrades result in an incremental increase in contract value. These costs are deferred on the consolidated balance sheets and amortized over the expected period of benefit on a straight-line basis. The Company also pays commissions on an ongoing basis based upon revenue recognized. In these cases, no incremental costs are deferred, as the commissions are earned and expensed in the same period for which the associated revenue is recognized. Based on the nature of the Company’s technology and services, and the duration of its relationships with its customers, the expected period of benefit is determined to be five years. Amortization is primarily included in sales and marketing expense in the consolidated statements of operations. Deferred commission and incentive payments are included in other assets on the consolidated balance sheets. Fair Value of Financial Instruments The Company’s available-for-sale securities are recorded at fair value. The Company’s cash and cash equivalents and restricted cash are recorded at cost, which approximates fair value. Additionally, accounts receivable, accounts payable, and accrued expenses approximate fair value due to their short-term nature. For disclosure purposes, the Company measures the fair value of its outstanding senior convertible notes using a market approach based on actual bids and offers in an over-the-counter market, or Level 2 inputs, on the last trading day of the period. Property and Equipment Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed on a straight-line basis over the estimated useful lives of the assets. The estimated useful life of each asset category is as follows: Computer and networking equipment 3 to 5 years Leasehold improvements Shorter of lease term or 5 years Furniture and fixtures 3 years Office equipment 3 years Internal-use software 3 to 5 years The Company periodically reviews the estimated useful lives of property and equipment and any changes to the estimated useful lives are recorded prospectively from the date of the change. Upon retirement or sale, the cost of the assets disposed of and the related accumulated depreciation are removed from the accounts, and any resulting gain or loss is included in the consolidated statements of operations. Repairs and maintenance costs are expensed as incurred. Internal-Use Software Development Costs Labor and related costs associated with internal-use software incurred during the application development stage are capitalized. Capitalization of costs begins when the preliminary project stage is completed, management has committed to funding the project, and it is probable that the project will be completed and the software will be used to perform the function intended. Capitalization ceases at the point when the project is fully tested, is substantially completed and is ready for its intended purpose. The capitalized amounts are included in property and equipment, net on the consolidated balance sheets. The Company amortizes such costs on a straight-line basis over the estimated useful life of the software, which is generally three estimated useful life. Costs incurred during the planning, training, and post-implementation stages of the software development life-cycle are expensed as incurred. Business Combinations The Company accounts for its acquisitions using the acquisition method of accounting, which requires, among other things, allocation of the fair value of purchase consideration to the tangible and intangible assets acquired and liabilities assumed at their estimated fair values on the acquisition date. The excess of the fair value of purchase consideration over the values of these identifiable assets and liabilities is recorded as goodwill. Determining the fair value of assets acquired and liabilities assumed requires significant judgment and estimates including the selection of valuation methodologies, future expected cash flows, discount rates, and useful lives. The Company’s estimates of fair value are based on assumptions believed to be reasonable, but which are inherently uncertain and, as a result, actual results may differ from estimates. During the measurement period, not to exceed one year from the date of acquisition, the Company may record adjustments to the assets acquired and liabilities assumed with a corresponding offset to goodwill to reflect new information obtained about facts and circumstances that existed as of the acquisition date. At the conclusion of the measurement period, or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are reflected in the consolidated statements of operations. Transaction costs associated with business combinations are expensed as incurred, and are included in general and administrative expense in the consolidated statements of operations. Segments The Company considers operating segments to be components of the Company in which separate financial information is available and is evaluated regularly by the Company’s Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources and in assessing performance. The CODM is the Chief Executive Officer (“CEO”). The CEO reviews financial information presented on a consolidated basis, accompanied by information about revenue, customer size, and industry vertical for purposes of allocating resources and evaluating financial performance. The Company has determined that it is organized as a single operating segment with no segment managers who are held accountable for operations, operating results, or plans for levels or components below the consolidated unit level. Accordingly, the Company has determined that it has a single reportable segment and operating segment. Goodwill, Intangible Assets and Other Long-Lived Assets Goodwill represents the excess of the purchase price of an acquired business over the fair value of the net tangible and identifiable intangible assets acquired. The carrying amount of goodwill is reviewed for impairment at least annually, in the fourth quarter, or whenever events or changes in circumstances indicate that the carrying value may not be recoverable. The Company has a single operating segment and reporting unit structure for all of the periods presented. As part of the annual goodwill impairment test, the Company first performs a qualitative assessment to determine whether further impairment testing is necessary. If, as a result of the qualitative assessment, it is more likely than not that the fair value of the reporting unit is less than its carrying amount, the quantitative impairment test will be required. If the Company has determined it necessary to perform a quantitative impairment assessment, the Company will compare the fair value of the reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, limited to the total amount of goodwill of the reporting unit. The Company did not recognize any goodwill impairment charges for any of the periods presented. The Company’s definite lived intangible assets are carried at cost, net of accumulated amortization. Intangible assets are amortized on a straight-line basis over their estimated useful lives. The Company estimates the useful life by estimating the expected period of economic benefit. The useful lives of the intangible assets are as follows: Customer relationships 3 to 8 years Developed technology 4 to 5 years Trade names 3 to 4 years Backlog 2 years Internet protocol addresses 10 years In-process research and development (“IPR&D”) Indefinite Long-lived assets, including property and equipment, definite lived intangible assets, and operating lease right-of-use assets, are reviewed for impairment whenever events or changes in circumstances, such as service discontinuance, technological obsolescence, significant decreases in market capitalization, facility closures, or work-force reductions indicate that the carrying amount of the long-lived asset or asset group may not be recoverable. When such events occur, the Company compares the carrying amount of the asset or asset group to the undiscounted expected future cash flows related to the asset or asset group. If this comparison indicates that an impairment is present, the amount of impairment is calculate as the difference between the carrying amount and the fair value of the asset or asset group. The Company’s indefinite lived intangibles are assessed annually for impairment. In addition to the recoverability assessment, the Company periodically reviews the remaining estimated useful lives of long-lived assets. If the estimated useful life assumption for any asset is changed due to new information, the remaining unamortized balance would be depreciated or amortized over the revised estimated useful life, on a prospective basis. Refer to Note 6 — Balance Sheet Information and Note 7 — Leases for discussion of impairment of property and equipment and impairment of operating lease right-of-use asset, respectively. Leases The Company leases office space and data centers (“colocation leases”) under non-cancelable operating leases with various expiration dates. The Company also leases server equipment under non-cancelable finance leases with various expiration dates. The Company determines if an arrangement contains a lease at inception. Operating lease right-of-use assets and lease liabilities are recognized at the present value of the future lease payments at commencement date. The interest rate implicit in the Company’s operating leases is not readily determinable, and therefore an incremental borrowing rate is estimated to determine the present value of future payments. The estimated incremental borrowing rate factors in a hypothetical interest rate on a collateralized basis with similar terms, payments, and economic environments. Operating lease right-of-use assets also include any prepaid lease payments and exclude lease incentives. Operating lease expense is recognized on a straight-line basis over the lease term commencing on the date the Company has the right to use the leased property. The lease terms may include options to extend or terminate the lease. The Company generally uses the base, non-cancelable, lease term when recognizing the lease assets and liabilities, unless it is reasonably certain that the option will be exercised. The lease agreements may contain variable costs such as common area maintenance, operating expenses or other costs. Variable lease costs are expensed as incurred on the consolidated statements of operations. The Company’s lease agreements generally do not contain any residual value guarantees or restrictive covenants. Certain of our operating leases contain both lease and non-lease components. Non-lease components for our office spaces include fixed payments for maintenance, utilities, real estate taxes, and management fees. Non-lease components for colocation leases include fixed payments for utilities and other operating costs. For both office spaces and colocation leases, the Company combines fixed lease and non-lease components and account for them as a single lease component. The Company leases networking equipment from a third party, through equipment finance leases. These leases include a bargain purchase option, resulting in a full transfer of ownership at the completion of the lease term. Operating leases are reflected in operating lease right-of-use assets, operating lease liabilities, and operating lease liabilities, non-current on the consolidated balance sheets. Finance leases are included in property and equipment, net, finance lease liabilities, and finance lease liabilities, non-current on the consolidated balance sheets. Convertible Debt The Company evaluated the terms of its debt in line with Accounting Standards Update (“ASU”) 2020-06 and concluded that the instrument does not require separation and that there were no other derivatives that required separation. The Company has combined these features with the host contract and accounted for the convertible debt as a single liability in long-term debt on the consolidated balance sheets. The carrying amount of the liability is based on the gross proceeds, net of the unamortized transaction costs incurred related to the issuance of the convertible debt instrument, and the partial repurchases made in 2022 and 2023. The debt discount from the net unamortized transaction cost is amortized to interest expense over the term of the convertible debt instrument using the effective interest rate method. Revenue recognition The Company primarily derives revenue from the sale of services to customers executing contracts in which the standard contract term is one year, although terms may vary by contract. Most of the Company’s contracts are non-cancelable over the contractual term. The majority of the Company’s usage-based contracts commit the customer to a minimum monthly level of usage and specify the rate at which the customer must pay for actual usage above the monthly minimum. The Company also offers subscriptions to access a unified security web application and application programming interface at a fixed rate. The Company recognizes revenue in accordance with Accounting Standards Codification (“ASC”) 606, where revenue is recognized upon transfer of control of promised products or services to customers in an amount that reflects the consideration the Company expects to receive in exchange for those products or services. The processing and recording of certain revenue requires a manual process, which uses a complex set of procedures to generate complete and accurate data to record these revenue transactions. The Company enters into contracts that can include various combinations of products and services, each of which are distinct and accounted for as separate performance obligations. Revenue is recognized net of any taxes collected from customers, which are subsequently remitted to governmental authorities. The Company’s contracts with customers often include promises to transfer multiple products and services to a customer. Determining whether products and services are considered distinct performance obligations that should be accounted for separately versus together may require significant judgment. Performance obligations generally represent stand-ready obligations that are satisfied over time as the customer simultaneously receives and consumes the benefits provided by the Company. These obligations can be network services, security, compute, professional services, support, and other edge cloud platform services. Accordingly, the Company’s revenue is recognized over time, consistent with the pattern of benefit provided to the customer over the term of the agreement. For contracts with multiple performance obligations that are delivered over different time periods, the Company allocates the contract transaction price to each performance obligation using the estimated standalone selling price ( “ SSP”) of each distinct good or service in the contract. Judgment is required to determine the SSP for each distinct performance obligation. The Company analyzes separate sales of its products and services or the discounted list price per management’s approved price list as a basis for estimating the SSP of these products and services. In instances where SSP is not directly observable, such as when the Company does not sell the product or service separately, the Company determines the SSP using information that may include market conditions and other observable inputs. The Company typically has more than one SSP for individual products and services due to the stratification of those products and services by customers and circumstances. In these instances, the Company may use information, such as geographic region and distribution channel, in determining the SSP. The transaction price in a contract for usage-based services is typically equal to the minimum commit price in the contract plus any variable amounts of usage above the minimum commitment, less any discounts provided. The transaction price in a contract that does not contain usage-based services is equal to the total contract value. Because the Company’s typical contracts represent distinct services delivered over time with the same pattern of transfer to the customer, usage-based consideration primarily related to actual consumption over the minimum commit levels is allocated to the period to which it relates. The amount of consideration recognized for usage above the minimum commit price is limited to the amount the Company expects to be entitled to receive in exchange for providing services. The Company has elected to apply the practical expedient for estimating and disclosing the variable consideration when variable consideration is allocated entirely to a wholly unsatisfied performance obligation or to a wholly unsatisfied promise to transfer a distinct good or service that forms part of a single performance obligation from its remaining performance obligations under these contracts. For contracts to which such practical expedient cannot be applied, consideration is estimated. For custom arrangements, other methods may be used as a measure of progress towards satisfying the performance obligations. Revenue on the Company’s subscription services are recognized ratably over their respective contractual term. At times, customers may request changes that either amend, replace, or cancel existing contracts. Judgment is required to determine whether the specific facts and circumstances within the contracts should be accounted for as a separate contract or as a prospective modification. In contracts where there are timing differences between when the Company transfers a promised good or service to the customer and when the customer pays for that good or service, the Company has determined its contracts do not include a significant financing component. The Company has also elected the practical expedient to not measure financing components for any contract where the timing difference is less than one year. Cost of Revenue Cost of revenue consists primarily of fees paid to network providers for bandwidth and to third-party network data centers for housing servers, also known as colocation costs. Cost of revenue also includes employee costs for network operation, build-out and support and services delivery, network storage costs, cost of managed services and software-as-a-service, depreciation of network equipment used to deliver services, and amortization of network-related internal-use software. The Company enters into contracts for bandwidth with third-party network providers with terms of typically one year. These contracts generally commit the Company to pay minimum monthly fees plus additional fees for bandwidth usage above the committed level. The Company enters into contracts for colocation services with third-party providers with terms typically ranging from one Research and Development Costs Research and development costs consist of primarily payroll and related personnel costs for the design, development, testing, and enhancement of the Company’s edge cloud platform. Research and development expenses also include cloud infrastructure fees for development and testing. Costs incurred in the development of the Company’s edge cloud platform are expensed as incurred, excluding those expenses which meet the criteria for the capitalization of internal-use software. Advertising Expense The Company recognizes advertising expense as incurred. The Company recognized total advertising expense of approximately $4.6 million, $2.5 million and $2.3 million for the years ended December 31, 2023, 2022, and 2021, respectively. Accounting for Stock-Based Compensation The Company recognizes stock-based compensation expense based on the grant-date fair value of the awards. The fair values of the restricted stock units (“RSUs”), restricted stock awards (“RSAs”) and performance stock awards (“PSUs”) are based on the fair value of the Company’s stock price on the grant date. The fair values of stock options and ESPP are based on the Black-Scholes option-pricing model. The fair value of the market-based performance stock awards (“MPSUs”) is measured using a Monte Carlo simulation valuation model. The determination of the fair value of a stock-based award is affected by the deemed fair value of the underlying stock price on the grant date, as well as assumptions regarding a number of other complex and subjective variables, including expected term and stock price volatility of the awards. Stock-based compensation expense for awards with service-based vesting only is recognized on a straight-line basis over the requisite service period of the awards, which is generally three Foreign Currency The functional currency of the Company’s foreign subsidiaries is the U.S. dollar. The monetary assets and liabilities that are denominated in a currency other than the U.S. dollar of the Company’s foreign subsidiaries are remeasured into U.S. dollars at the exchange rate on the balance sheet date, while non-monetary items are remeasured at historical rates. Revenue and expenses are remeasured at average exchange rates during the period. Transaction gains and losses that arise from exchange rate fluctuations on transactions denominated in a currency other than the functional currency are included in other income (expense), net in the consolidated statements of operations. The aggregate transaction gain or loss for the years ended December 31, 2023, 2022 and 2021 is included in the determination of net income for the period and was not material to the respective periods. Income Taxes The Company accounts for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, the Company determines deferred tax assets and liabilities on the basis of the differences between the financial statement and tax bases of assets and liabilities by using enacted tax rates for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. The Company recognizes deferred tax assets to the extent that it believes that these assets are more likely than not to be realized. In making such a determination, the Company considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. If the Company determines that it would be able to realize its deferred tax assets in the future in excess of their net recorded amount, the Company would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes. The Company records uncertain tax positions in accordance with ASC 740 on the basis of a two-step process in which (1) it determines whether it is more likely than not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, the Company recognizes the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority. The Company recognizes interest and penalties related to unrecognized tax benefits on the income tax expense line in the accompanying consolidated statement of ope

Revenue

Revenue	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Disaggregation of revenue Revenue by geography is based on the billing address of the customer. Aside from the United States, no other single country accounted for more than 10% of revenue for the years ended December 31, 2023, 2022 and 2021. The following table presents the Company’s net revenue by geographic region: Year ended December 31, 2023 2022 2021 (in thousands) United States $ 370,424 $ 316,149 $ 260,399 Asia Pacific 72,873 58,073 39,496 Europe 42,770 38,469 35,177 All other 19,921 20,034 19,258 Total revenue $ 505,988 $ 432,725 $ 354,330 The majority of the Company’s revenue is derived from enterprise customers. In the first quarter of 2023, the Company updated its methodology (“new methodology”) by which it calculates its customer count metrics, including Total Customer Count, Enterprise Customer Count and associated metrics. Under the prior methodology, enterprise customers is defined as customers with revenue in excess of $100,000 over the trailing 12-month period. The following table presents the Company’s net revenue for enterprise and non-enterprise customers based on the prior methodology: Year ended December 31, 2023 2022 2021 (in thousands) Enterprise customers $ 458,472 $ 386,853 $ 313,360 Non-enterprise customers 47,516 45,872 40,970 Total revenue $ 505,988 $ 432,725 $ 354,330 Under the new methodology, enterprise customers is defined as customers with annualized current quarter revenue in excess of $100,000. This is calculated by taking the sum of revenue for each customer within the quarter and multiplying it by four. The following table presents the Company’s net revenue for enterprise and non-enterprise customers based on the new methodology: Year ended December 31, 2023 2022 2021 (in thousands) Enterprise customers $ 464,452 $ 393,152 $ 315,918 Non-enterprise customers 41,536 39,573 38,412 Total revenue $ 505,988 $ 432,725 $ 354,330 Contract balances The timing of revenue recognition may differ from the timing of invoicing to customers. The Company has an unconditional right to consideration when it invoices its customers and records a receivable. The Company records a contract asset, or a receivable, when revenue is recognized prior to invoicing. The Company records a contract liability, or deferred revenue, when revenue is recognized subsequent to invoicing. Deferred revenue includes amounts billed to customers for which revenue has not been recognized and consists of the unearned portions of edge cloud platform usage and billings to customers for the Company’s security subscription services. Amounts that have been invoiced for annual subscriptions, but not collected, are recorded in accounts receivable and in unearned revenue or in revenue depending on whether services have been delivered to the customer. The Company’s payment terms and conditions vary by contract type, and generally range from 30 to 90 days. The following table presents the Company’s contract assets and contract liabilities as of December 31, 2023 and 2022: As of December 31, 2023 As of December 31, 2022 (in thousands) Contract assets $ 621 $ 19 Contract liabilities $ 38,150 $ 30,544 The following table presents revenue recognized during the years ended December 31, 2023 and 2022 from amounts included in the contract liability at the beginning of the period: Year ended December 31, 2023 2022 (in thousands) Revenue recognized in the period from amounts included in contract liability at the beginning of the period $ 28,616 $ 26,274 Remaining performance obligations As of December 31, 2023, the aggregate amount of the transaction price in the Company's contracts allocated to remaining performance obligations that were unsatisfied or partially unsatisfied was $235.7 million. This amount includes future committed revenue for periods within current contracts with customers, as well as deferred revenue arising from consideration invoiced for which the related performance obligations have not been satisfied. The Company has elected to not provide certain information about its remaining performance obligations for service contracts with an original contract duration of one year or less. As of December 31, 2023, the Company expects to recognize approximately 80% of its remaining performance obligations over the next 12 months. The Company’s typical contractual term with its customers is one year, although terms may vary by contract. Costs to obtain a contract As of December 31, 2023 and December 31, 2022, the Company’s costs to obtain contracts were as follows: As of December 31, 2023 As of December 31, 2022 (in thousands) Deferred contract costs, net $ 61,981 $ 50,523 During the years ended December 31, 2023, 2022 and 2021, the Company recognized $15.5 million, $8.9 million and $6.3 million of amortization related to deferred contract costs, respectively. These costs are recorded within sales and marketing expenses on the accompanying consolidated statements of operations.

Investments and Fair Value Meas

Investments and Fair Value Measurements	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Investments and Fair Value Measurements	Investments and Fair Value Measurements The Company’s total cash, cash equivalents and marketable securities consisted of the following: As of December 31, 2023 2022 (in thousands) Cash and cash equivalents: Cash $ 21,269 $ 46,516 U.S. Treasury securities 52,830 — Money market funds 21,166 96,875 Commercial paper 12,656 — Total cash and cash equivalents 107,921 143,391 Marketable securities: U.S. Treasury securities $ 73,448 $ 287,988 Corporate notes and bonds 105,566 $ 71,744 Commercial paper 25,934 — Agency bonds 9,851 — Asset-backed securities — 175 Municipal securities — 2,221 Foreign government and supranational securities — 12,453 Total marketable securities, current $ 214,799 $ 374,581 Corporate notes and bonds 5,999 140,949 Asset-backed securities 89 24,156 Total marketable securities, non-current $ 6,088 $ 165,105 Total marketable securities $ 220,887 $ 539,686 Total cash, cash equivalents and marketable securities $ 328,808 $ 683,077 The following table summarizes adjusted cost, gross unrealized gains and losses, and fair value related to cash and cash equivalents and available-for-sale securities on the accompanying consolidated balance sheets as of December 31, 2023 and December 31, 2022: As of December 31, 2023 Amortized Gross Gross Fair (in thousands) Cash and cash equivalents: U.S. Treasury securities $ 52,824 $ 6 $ — $ 52,830 Commercial paper $ 12,663 $ — $ (7) $ 12,656 Marketable securities: U.S. Treasury securities $ 73,444 $ 8 $ (4) $ 73,448 Corporate notes and bonds 112,487 9 (931) 111,565 Commercial paper 25,946 — (12) 25,934 Asset-backed securities 89 — — 89 Agency bonds 9,854 — (3) 9,851 Total available-for-sale investments $ 287,307 $ 23 $ (957) $ 286,373 As of December 31, 2022 Amortized Gross Unrealized Gain Gross Fair (in thousands) Marketable securities: U.S. Treasury securities $ 291,685 $ — $ (3,697) $ 287,988 Corporate notes and bonds 217,187 — (4,494) 212,693 Asset-backed securities 24,617 — (286) 24,331 Municipal securities 2,322 — (101) 2,221 Foreign government and supranational securities 12,522 — (69) 12,453 Total available-for-sale investments $ 548,333 $ — $ (8,647) $ 539,686 There were no material realized gains or losses from sales of marketable securities that were reclassified out of accumulated other comprehensive income (loss) into other income (expense), net as of December 31, 2023 and December 31, 2022. There were 28 and 76 securities in a continuous loss position for 12 months or longer as of December 31, 2023, and 2022, respectively. Investments are reviewed periodically to identify possible other-than-temporary impairments. For the years ended December 31, 2023 and 2022, the Company did not record any impairment charges for its marketable debt securities in its consolidated statements of operations. No impairment loss has been recorded on the securities as the Company does not intend to sell any impaired securities, nor is it more likely than not that the Company would be required to sell impaired securities before recovery of amortized cost basis. Furthermore, the Company has determined that the decline in fair value of the investment is not due to credit related factors. Fair Value of Financial Instruments For certain of the Company’s financial instruments, including cash held in banks, accounts receivable, and accounts payable, the carrying amounts approximate fair value due to their short maturities, and are therefore excluded from the fair value tables below. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There is a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: Level 1—Observable inputs such as quoted prices in active markets for identical assets or liabilities; Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and Level 3—Unobservable inputs that are supported by little or no market activity, which require management judgment or estimation. The Company measures its cash equivalents, marketable securities, and restricted cash at fair value. The Company classifies its cash equivalents, marketable securities and restricted cash within Level 1 or Level 2 because the Company values these investments using quoted market prices or alternative pricing sources and models utilizing market observable inputs. The Company classifies its investments, which are comprised of corporate notes and bonds, commercial paper, U.S. treasury securities, agency bonds, foreign government and supranational securities and asset-backed securities within Level 2 of the fair value hierarchy because the fair value of these securities is priced by using inputs based on non-binding market consensus prices that are primarily corroborated by observable market data or quoted market prices for similar instruments. Financial assets and liabilities measured and recorded at fair value on a recurring basis consisted of the following types of instruments: As of December 31, 2023 Level 1 Level 2 Level 3 Total (in thousands) Cash equivalents: Money market funds $ 21,166 $ — $ — $ 21,166 U.S. Treasury securities — 52,830 — 52,830 Commercial paper — 12,656 — 12,656 Total cash equivalents 21,166 65,486 — 86,652 Marketable securities: U.S. Treasury securities — 73,448 — 73,448 Corporate notes and bonds — 111,565 — 111,565 Commercial paper — 25,934 — 25,934 Asset-backed securities — 89 — 89 Agency bonds — 9,851 — 9,851 Total marketable securities — 220,887 — 220,887 Restricted cash: Restricted cash, current 150 — — 150 Total restricted cash 150 — — 150 Total financial assets $ 21,316 $ 286,373 $ — $ 307,689 As of December 31, 2022 Level 1 Level 2 Level 3 Total (in thousands) Cash equivalents: Money market funds $ 96,875 $ — $ — $ 96,875 Total cash equivalents 96,875 — — 96,875 Marketable securities: U.S. Treasury securities — 287,988 — 287,988 Corporate notes and bonds — 212,693 — 212,693 Asset-backed securities — 24,331 — 24,331 Municipal securities — 2,221 — 2,221 Foreign government and supranational securities — 12,453 — 12,453 Total marketable securities — 539,686 — 539,686 Restricted cash: Restricted cash, current 150 — — 150 Total restricted cash 150 — — 150 Total financial assets $ 97,025 $ 539,686 $ — $ 636,711 Restricted cash was $0.2 million as of both December 31, 2023 and 2022. The restricted cash balance consisted of letters of credit related to lease arrangements that were collateralized by the Company’s cash. The amounts as of December 31, 2023 and 2022, were both classified as current on the Company’s consolidated balance sheets.

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2023
Business Combination and Asset Acquisition [Abstract]
Business Combinations	Business Combinations Glitch, Inc. On May 18, 2022, the Company acquired 100% of the voting equity interest of Glitch, Inc. (“Glitch”), a software company specializing in developer project management tools, for $34.9 million in cash, of which $8.0 million was held back as security for indemnification claims under the terms of the merger agreement (“Holdback”). During the year ended December 31, 2023, $4.1 million of the Holdback was distributed to certain shareholders of Glitch and the remaining Holdback will be distributed 24 months following the acquisition closing date. The acquisition expands the Company’s brand awareness within the developer community and bolsters the Company’s existing product offerings by making it easier to innovate at a layer in the Company’s software stack. The Company accounted for the transaction as a business combination. The purchase price was preliminarily allocated based on the estimated fair value of the identified intangible assets of $2.0 million, cash of $1.6 million and other net assets of $0.6 million, and goodwill of $32.5 million. The goodwill was primarily attributed to the value of synergies created with the acquisition of Glitch’s technology offering. Goodwill is not deductible for income tax purposes. Identifiable finite-lived intangible assets were comprised of the following (in thousands): Total Estimated useful life (in years) Developed technology $ 630 4 Customer relationships 760 3 Trade name 610 4 Total intangible assets acquired $ 2,000 For the year ended December 31, 2022, we incurred $2.0 million in acquisition-related expenses. The acquired intangible assets have a total weighted average amortization period of 3.6 years. From the date of the acquisition, the financial results of Glitch have been included in and are not material to the Company’s consolidated financial statements. Pro forma revenue and results of operations have not been presented because the historical results are not material to the consolidated financial statements in any period presented.

Balance Sheet Information

Balance Sheet Information	12 Months Ended
	Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Information	Balance Sheet Information Allowance for Credit Losses The activity in the accounts receivable reserves is as follows: As of December 31, 2023 2022 2021 (in thousands) Beginning balance $ 5,029 $ 3,311 $ 3,248 Additions to the reserves 2,025 2,406 196 Write-offs and adjustments — (688) (133) Ending balance $ 7,054 $ 5,029 $ 3,311 Property and Equipment, Net Property and equipment, net consisted of the following: As of December 31, 2023 2022 (in thousands) Computer and networking equipment $ 224,313 $ 225,009 Leasehold improvements 8,605 8,374 Furniture and fixtures 2,142 1,792 Office equipment 1,228 1,176 Internal-use software 97,623 66,488 Property and equipment, gross 333,911 302,839 Accumulated depreciation and amortization (157,303) (122,461) Property and equipment, net $ 176,608 $ 180,378 During the year ended December 31, 2023, the Company recognized an impairment charge of $4.3 million, of which $3.0 million related to property and equipment, net and $1.3 million related to advance payments for the purchase of property and equipment. The write-off was primarily related to excess computer and networking equipment including software the Company does not expect to use and therefore abandoned. Impairment charges are included within impairment expense in the consolidated statements of operations. There were no impairments during the years ended December 31, 2022 and 2021. Depreciation on property and equipment for the years ended December 31, 2023, 2022 and 2021 was approximately $51.6 million, $42.6 million, and $28.8 million, respectively. Included in these amounts was amortization expense for capitalized internal-use software costs of approximately $14.0 million, $8.6 million and $4.6 million for the years ended December 31, 2023, 2022 and 2021, respectively. As of December 31, 2023 and 2022, the unamortized balance of capitalized internal-use software costs on the Company’s consolidated balance sheets was approximately $62.6 million and $45.5 million, respectively. The Company leases certain networking equipment from various third parties through equipment finance leases. The Company’s networking equipment assets as of December 31, 2023 and 2022 , included a total of $74.7 million and $77.3 million acquired under finance lease agreements, respectively. These leases are capitalized in property and equipment, and the related amortization of assets under finance leases is included in depreciation and amortization expense. The accumulated depreciation of the associated networking equipment assets under finance leases totaled $40.1 million and $28.1 million as of December 31, 2023 and 2022 , respectively. Other Assets Other assets consisted of the following: As of December 31, 2023 2022 (in thousands) Deferred contract costs, net $ 61,981 $ 50,523 Advance payment for purchase of property and equipment 24,509 37,013 Other assets 4,289 5,086 Total other assets $ 90,779 $ 92,622 Accrued Expenses Accrued expenses consisted of the following: As of December 31, 2023 2022 (in thousands) Accrued compensation and related benefits $ 14,918 $ 20,204 Accrued bonus 24,614 15,818 Accrued colocation and bandwidth costs 14,362 10,448 Other tax liabilities 4,344 8,698 Other accrued expenses 3,580 5,993 Total accrued expenses $ 61,818 $ 61,161 Other Current Liabilities Other current liabilities consisted of the following: As of December 31, 2023 2022 (in thousands) Deferred revenue $ 33,824 $ 28,047 Accrued computer and networking equipment 1,673 1,467 Holdback payable 3,771 4,013 Other current liabilities 1,271 867 Total other current liabilities $ 40,539 $ 34,394 Accumulated Other Comprehensive Loss The following table summarizes the changes in accumulated other comprehensive loss, which is reported as a component of stockholders’ equity: Foreign Currency Translation Unrealized gain/(loss) for available-for-sale investments Accumulated Other Comprehensive Income (Loss) (in thousands) Balance at December 31, 2020 $ (36) $ 42 $ 6 Other comprehensive loss (286) (2,347) (2,633) Balance at December 31, 2021 (322) (2,305) (2,627) Other comprehensive loss (255) (6,404) (6,659) Balance at December 31, 2022 $ (577) $ (8,709) $ (9,286) Other comprehensive income 565 7,713 8,278 Balance at December 31, 2023 $ (12) $ (996) $ (1,008)

Leases

Leases	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Leases	Leases The Company has operating leases for corporate offices and data centers (“colocation” leases), and finance leases for networking equipment. The Company’s operating leases have remaining lease terms ranging from less than 1 year to 7 years, some of which include options to extend the leases. The Company’s finance leases have remaining lease terms up to 1 year. The Company also subleases a portion of its corporate office spaces. The Company’s subleases have remaining lease terms ranging from 1 year to 7 years. Sublease income was $1.2 million, $0.9 million, and $1.0 million for the years ended December 31, 2023, 2022 and 2021, respectively. The components of lease cost were as follows: As of December 31, 2023 2022 2021 (in thousands) Operating lease cost: Operating lease cost $ 26,996 $ 30,976 $ 26,716 Variable lease cost 15,112 11,736 6,820 Total operating lease cost $ 42,108 $ 42,712 $ 33,536 Finance lease cost: Amortization of assets under finance lease $ 14,391 $ 14,539 $ 6,834 Interest 1,328 2,381 1,754 Total finance lease cost $ 15,719 $ 16,920 $ 8,588 The short-term lease costs were not material for the years ended December 31, 2023, 2022 and 2021. During the years ended December 31, 2023 and 2022, the Company recognized impairment on its operating lease right-of-use assets of $0.7 million and $2.1 million, respectively. The Company did not recognize any material impairment on its operating lease right-of-use assets for the year ended December 31, 2021. As of December 31, 2023 2022 2021 (in thousands) Weighted Average Remaining Lease term (in years): Operating leases 3.48 4.09 4.41 Finance leases 1.00 1.74 2.23 Weighted Average Discount Rate: Operating leases 6.03 % 5.36 % 5.20 % Finance leases 4.67 % 4.73 % 4.86 % Future minimum lease payments under non-cancellable leases as of December 31, 2023 were as follows: Operating Leases Finance Leases (in thousands) Year ending December 31, 2024 $ 28,160 $ 16,064 2025 20,868 1,617 2026 18,896 — 2027 10,502 — 2028 2,446 — Thereafter 1,838 — Total future minimum lease payments $ 82,710 $ 17,681 Less: imputed interest (7,905) (395) Total liability $ 74,805 $ 17,286 As of December 31, 2023, the Company has undiscounted commitments of $2.3 million for operating leases that have not yet commenced, and therefore are not included in the right-of-use asset or operating lease liability. These operating leases will commence in 2024 with lease terms of 3 years.
Leases	Leases The Company has operating leases for corporate offices and data centers (“colocation” leases), and finance leases for networking equipment. The Company’s operating leases have remaining lease terms ranging from less than 1 year to 7 years, some of which include options to extend the leases. The Company’s finance leases have remaining lease terms up to 1 year. The Company also subleases a portion of its corporate office spaces. The Company’s subleases have remaining lease terms ranging from 1 year to 7 years. Sublease income was $1.2 million, $0.9 million, and $1.0 million for the years ended December 31, 2023, 2022 and 2021, respectively. The components of lease cost were as follows: As of December 31, 2023 2022 2021 (in thousands) Operating lease cost: Operating lease cost $ 26,996 $ 30,976 $ 26,716 Variable lease cost 15,112 11,736 6,820 Total operating lease cost $ 42,108 $ 42,712 $ 33,536 Finance lease cost: Amortization of assets under finance lease $ 14,391 $ 14,539 $ 6,834 Interest 1,328 2,381 1,754 Total finance lease cost $ 15,719 $ 16,920 $ 8,588 The short-term lease costs were not material for the years ended December 31, 2023, 2022 and 2021. During the years ended December 31, 2023 and 2022, the Company recognized impairment on its operating lease right-of-use assets of $0.7 million and $2.1 million, respectively. The Company did not recognize any material impairment on its operating lease right-of-use assets for the year ended December 31, 2021. As of December 31, 2023 2022 2021 (in thousands) Weighted Average Remaining Lease term (in years): Operating leases 3.48 4.09 4.41 Finance leases 1.00 1.74 2.23 Weighted Average Discount Rate: Operating leases 6.03 % 5.36 % 5.20 % Finance leases 4.67 % 4.73 % 4.86 % Future minimum lease payments under non-cancellable leases as of December 31, 2023 were as follows: Operating Leases Finance Leases (in thousands) Year ending December 31, 2024 $ 28,160 $ 16,064 2025 20,868 1,617 2026 18,896 — 2027 10,502 — 2028 2,446 — Thereafter 1,838 — Total future minimum lease payments $ 82,710 $ 17,681 Less: imputed interest (7,905) (395) Total liability $ 74,805 $ 17,286 As of December 31, 2023, the Company has undiscounted commitments of $2.3 million for operating leases that have not yet commenced, and therefore are not included in the right-of-use asset or operating lease liability. These operating leases will commence in 2024 with lease terms of 3 years.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill The changes in the carrying amount of goodwill for th e years ended December 31, 2023 and 2022 are as follows : Year ended December 31, 2023 2022 (in thousands) Beginning balance $ 670,185 $ 636,805 Goodwill acquired from business combinations — 33,419 Foreign currency translation and other adjustments 171 (39) Ending balance $ 670,356 $ 670,185 The goodwill acquired from business combinations are from the Company’s acquisition described in Note 5 — Business Combinations. The Company did not record an impairment charge on goodwill for the fiscal years ended December 31, 2023, 2022 and 2021. Intangible Assets, net As of December 31, 2023 and December 31, 2022, the Company’s intangible assets consisted of the following: As of December 31, 2023 As of December 31, 2022 Gross carrying value Accumulated amortization Net carrying value Gross carrying value Accumulated amortization Net carrying value (in thousands) Intangible assets: Customer relationships $ 69,860 $ (28,473) $ 41,387 $ 69,860 $ (19,582) $ 50,278 Developed technology 50,130 (32,424) 17,706 50,130 (22,367) 27,763 Trade names 3,910 (3,542) 368 3,910 (2,564) 1,346 Internet protocol addresses 4,984 (1,970) 3,014 4,984 (1,471) 3,513 Backlog — — — 2,200 (2,200) — Total intangible assets $ 128,884 $ (66,409) $ 62,475 $ 131,084 $ (48,184) $ 82,900 The Company’s customer relationships, developed technology, trade names, backlog and Internet protocol addresses represent intangible assets subject to amortization. Amortization expense was $20.4 million, $21.7 million and $21.2 million, for the years ended December 31, 2023, 2022 and 2021, respectively. The Company did not purchase any intangible assets during the year ended December 31, 2023. During the year ended December 31, 2022, the Company added $2.0 million of intangible assets from the acquisition of Glitch, which are subject to amortization. During the year ended December 31, 2021, the Company purchased $2.1 million of intangible assets. The Company did not record any impairments during the years ended December 31, 2023, 2022 and 2021. The expected amortization expense of intangible assets subject to amortization as of December 31, 2023 is as follows: As of December 31, 2023 (in thousands) 2024 $ 19,599 2025 16,976 2026 9,193 2027 9,051 2028 6,891 Thereafter 765 Total $ 62,475

Debt Instruments

Debt Instruments	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Debt Instruments	Debt Instruments Senior Secured Credit Facilities Agreement On February 16, 2021, the Company entered into a Senior Secured Credit Facilities Agreement (“Credit Agreement”) with the lenders from time to time party thereto (the “Lenders”) and Silicon Valley Bank, as a lender and as administrative agent and collateral agent for the Lenders, for an aggregate commitment amount of $100.0 million with a maturity date of February 16, 2024. The Company recorded $0.6 million of debt issuance costs associated with the Credit Agreement in other assets on the Company’s consolidated balance sheet. The Credit Agreement originally bore interest at a rate per annum equal to the sum of LIBOR for the applicable interest period plus 1.75% to 2.00%, depending on the average daily outstanding balance of all loans and letters of credit under the Credit Agreement. On June 28, 2023, the Company entered into the First Amendment to Credit Agreement with the Lenders and First-Citizens Bank & Trust Company (successor by purchase to the Federal Deposit Insurance Corporation as Receiver for Silicon Valley Bridge Bank, N.A. (as successor to Silicon Valley Bank)), as a lender and as administrative agent and collateral agent for the Lenders, which, among other things, amended the interest rate provisions of the Credit Agreement to replace LIBOR with the Secured Overnight Finance Rate (“SOFR”) as the interest rate benchmark. On February 16, 2024, the Company entered into the Second Amendment to Credit Agreement with the Lenders and Silicon Valley Bank, a division of First-Citizens Bank & Trust Company, as a lender and as administrative agent and collateral agent for the Lenders, which, among other things, extended the maturity date of the loans under the Credit Agreement to June 14, 2024. As amended, the revolving loans bear interest, at the Company’s election, at an annual rate based on SOFR or a base rate. Loans based on SOFR bear interest at a rate per annum equal to SOFR, plus an adjustment of 0.10%, plus 1.75% to 2.00%, depending on the average daily outstanding balance of all loans and letters of credit under the Credit Agreement. Loans based on the base rate bear interest at a rate per annum equal to the base rate plus 0.75% to 1.00%, depending on the average daily outstanding balance of all loans and letters of credit under the Credit Agreement. Interest payments on outstanding borrowings are due on the last day of each interest period. The Credit Agreement has a commitment fee on the unused portion of the borrowing commitment, which is payable on the last day of each calendar quarter at a rate per annum of 0.20% to 0.25% depending on the average daily outstanding balance of all loans and letters of credit under the Credit Agreement. In addition, the Company’s Credit Agreement contains a financial covenant that requires the Company to maintain a consolidated adjusted quick ratio of at least 1.25 tested on a quarterly basis as well as a springing revenue growth covenant for certain periods if the Company’s consolidated adjusted quick ratio falls below 1.75 on the last day of any fiscal quarter. The Credit Agreement requires the Company to comply with various affirmative and negative covenants, and contains customary events of default. As of December 31, 2023 and 2022, the Company was in compliance with all of the Credit Agreement’s covenants. During the years ended December 31, 2023 and 2022, no amounts were drawn down on the Company’s Credit Agreement. As of the years ended December 31, 2023 and 2022, no amounts were outstanding under the Credit Agreement. Convertible Senior Notes On March 5, 2021, the Company issued approximately $948.8 million aggregate principal amount of 0% convertible senior notes due 2026 (the “Notes”), including the exercise in full by the initial purchasers of their option to purchase up to an additional approximately $123.8 million principal amount of the Notes. The Notes were issued in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act. The Notes will mature on March 15, 2026, unless earlier converted, redeemed or repurchased. The net proceeds from the issuance of the Notes were approximately $930.0 million after deducting the initial purchasers’ discounts and transaction costs. The Company may not redeem the Notes prior to March 20, 2024. On or after March 20, 2024, the Company may redeem for cash, all or any portion of the Notes, at the Company’s option, at a redemption price equal to 100% of the principal amount of the Notes to be redeemed, plus accrued and unpaid special interest, if any, to, but excluding, the redemption date, if the last reported sale price of the Company’s Class A common stock has been at least 130% of the conversion price for the Notes then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on, and including, the trading day immediately preceding the date on which the Company provides notice of redemption. No sinking fund is provided for the Notes. Holders of the Notes may convert their notes at their option at any time prior to the close of business on the business day immediately preceding December 15, 2025, only under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending on June 30, 2021 (and only during such calendar quarter), if the last reported sale price of the Company’s Class A common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price for the Notes on each applicable trading day; (ii) during the five business day period after any ten consecutive trading day period (the “Measurement Period”) in which the trading price, as defined in the indenture agreement governing the Note filed with the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on March 5, 2021, per $1,000 principal amount of notes for each trading day of the Measurement Period was less than 98% of the product of the last reported sale price of the Company’s Class A common stock and the conversion rate on each such trading day; (iii) if the Company calls such Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the applicable redemption date, but only with respect to the Notes called (or deemed called) for redemption; or (iv) upon the occurrence of specified corporate events. On or after December 15, 2025 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their notes at any time, regardless of the foregoing circumstances. Upon conversion, the Company may satisfy its conversion obligation by paying or delivering, as the case may be, cash, shares of its Class A common stock or a combination of cash and shares of its Class A common stock, at the Company’s election. The initial conversion rate is 9.7272 shares of Class A common stock per $1,000 principal amount of Notes, equivalent to an initial conversion price of approximately $102.80 per share of Class A common stock. The conversion rate is subject to adjustment as described in the indenture governing the Notes but will not be adjusted for any accrued and unpaid special interest. In addition, following certain corporate events that occur prior to the maturity date of the Notes or if the Company delivers a notice of redemption in respect of the Notes, the Company will, in certain circumstances, increase the conversion rate of the Notes for a holder who elects to convert its Notes, in connection with such a corporate event or convert its Notes called (or deemed called) for redemption during the related redemption period, as the case may be. The indenture includes customary covenants and sets forth certain events of default after which the Notes may be declared immediately due and payable and sets forth certain types of bankruptcy or insolvency events of default involving the Company after which the Notes become automatically due and payable. If the Company undergoes a fundamental change, as defined in the indenture agreement governing the Notes, then subject to certain conditions and except as described in the indenture governing the Notes, holders may require the Company to repurchase for cash all or any portion of their Notes at a fundamental change repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid special interest, if any, to, but excluding, the fundamental change repurchase date. The Company evaluated the terms of its debt and concluded that the instrument does not require separation and that there were no other derivatives that required separation. As such, the Company has combined these features with the host contract and the Company accounts for its convertible debt as a single liability in long-term debt on its consolidated balance sheet. The initial purchasers’ discounts and transaction costs of $18.6 million incurred related to the issuance of the Notes were classified as liability and represents the difference between the principal amount of the Notes and the liability component (the “debt discount”), which is amortized to interest expense using the effective interest method over the term of the Notes. As of December 31, 2023, the conversion conditions had not been met and therefore the Notes were not yet convertible. On May 25, 2022, the Company entered into separate, privately negotiated transactions with certain holders of the Notes to repurchase (the “Repurchases”) $235.0 million aggregate principal amount of the Notes for an aggregate cash repurchase price of $176.4 million and aggregate transaction costs of $0.7 million. The Repurchases were accounted for as a debt extinguishment that resulted in a net gain of $54.4 million, which was recorded as non-operating income on the Company's consolidated statement of operations for the year ended December 31, 2022. During the year ended December 31, 2023, the Company entered into several separate privately negotiated transactions with certain holders of the Notes to repurchase $367.3 million aggregate principal amount of the Notes for an aggregate cash repurchase price of $309.1 million and aggregate transaction costs of $2.0 million. The Repurchases were accounted for as a debt extinguishment that resulted in a net gain of $52.4 million, which was recorded as non-operating income on the Company’s consolidated statement of operations for the year ended December 31, 2023. The following table reflects the carrying values of the debt agreements as of December 31, 2023 and 2022 as follows : Year ended December 31, 2023 2022 (in thousands) Convertible Senior notes (effective interest rate of 0.38% and 0.40% as of December 31, 2023 and 2022, respectively) Principal amount $ 346,489 $ 713,753 Less: unamortized debt issuance costs (2,982) (9,043) Less: current portion of long-term debt — — Long-term debt, less current portion $ 343,507 $ 704,710 For the years ended December 31, 2023, 2022 and 2021, interest expense related to the Company’s debt obligations was $2.7 million, $3.4 million, and $3.5 million respectively. As of December 31, 2023 and 2022, the total estimated fair value of the Notes were $301.4 million and $517.5 million, respectively.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Purchase Commitments As of December 31, 2023, the Company had long-term commitments for cost of revenue related agreements (i.e., bandwidth usage, peering and other managed services with various networks, fixed asset vendors, Internet service providers and other third-party vendors). The Company also has non-cost of revenue long-term commitments for various non-cancelable agreements. Aside from the Company’s finance and operating lease commitments, including its colocation operating commitments, which have been disclosed in Note 7—Leases, the minimum future commitments related to the Company’s purchase commitments as of December 31, 2023 were as follows: Cost of Revenue Commitments Operating Expense Commitments Total Purchase Commitments (in thousands) 2024 $ 48,699 $ 10,480 $ 59,179 2025 6,105 3,797 9,902 2026 8,111 2,097 10,208 2027 111 — 111 2028 40 — 40 Thereafter — — — Total $ 63,066 $ 16,374 $ 79,440 Sales and Use Tax The Company conducts its operations in many tax jurisdictions throughout the United States. In many of these jurisdictions, non-income-based taxes, such as sales and use and telecommunications taxes are assessed on the Company’s operations. The Company is subject to indirect taxes, and may be subject to certain other taxes, in some of these jurisdictions. Historically, the Company has not billed or collected these taxes and, in accordance with GAAP, the Company has recorded a provision for its tax exposure in these jurisdictions when it is both probable that a liability has been incurred and the amount of the exposure can be reasonably estimated. As a result, the Company has recorded a liability of $4.3 million and $7.6 million as of December 31, 2023 and 2022, respectively. These estimates are based on several key assumptions, including the taxability of the Company’s products, the jurisdictions in which the Company believes it has nexus and the sourcing of revenues to those jurisdictions. In the event these jurisdictions challenge the Company’s assumptions and analysis, its actual exposure could differ materially from its current estimates. Legal Matters From time to time, the Company has been and may be subject to legal proceedings and claims. Such matters are subject to many uncertainties and outcomes are not predictable with assurance. The Company accrues for contingencies when it believes that a loss is probable and that the Company can reasonably estimate the amount of any such loss. The Company is not presently a party to any legal proceedings that, if determined adversely to it, would individually or taken together have a material effect on the Company’s business, results of operations, financial condition, or cash flows. As of December 31, 2023, the Company has not recorded any significant accruals for loss contingencies associated with such legal proceedings, determined that an unfavorable outcome is probable or reasonably possible, or determined that the amount or range of any possible loss is reasonably estimable. Indemnification The Company enters into standard indemnification agreements in the ordinary course of business. Pursuant to these agreements, the Company agrees to indemnify, hold harmless, and reimburse the indemnified party for losses suffered or incurred by the indemnified party, generally the Company’s business partners or customers, in connection with its provision of its services. Generally, these obligations are limited to claims relating to infringement of a patent, copyright, or other intellectual property right, breach of the Company’s security or data protection obligations, or its negligence, willful misconduct, or violation of law. Subject to applicable statutes of limitation, the term of these indemnification agreements is generally for the duration of the agreement. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited; however, the Company carries insurance that covers certain third-party claims relating to the Company’s services and could limit its exposure in that respect. The Company has agreed to indemnify each of its officers and directors during his or her lifetime for certain events or occurrences that happen by reason of the fact that the officer or director is, was, or has agreed to serve as an officer or director of the Company. The Company has director and officer insurance policies that may limit its exposure and may enable it to recover a portion of certain future amounts paid. To date, the Company has not encountered material costs as a result of such indemnification obligations and has not accrued any related liabilities in its financial statements. In assessing whether to establish an accrual, the Company considers such factors as the degree of probability of an unfavorable outcome and the ability to make a reasonable estimate of the amount of loss.

Stockholders_ Equity

Stockholders’ Equity	12 Months Ended
	Dec. 31, 2023
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders’ Equity Common Stock The Company’s Amended and Restated Certificate of Incorporation, as amended and restated in May 2019, authorizes the issuance of 1.0 billion shares of Class A common stock and 94.1 million shares of Class B common stock, each at a par value per share of $0.00002. Holders of Class A common stock are entitled to one vote per share and holders of Class B common stock are entitled to 10 votes per share. On July 12, 2021, all outstanding shares of Class B common stock automatically converted into the same number of shares of Class A common stock (the “Conversion”) pursuant to the terms of the Company’s amended and restated certificate of incorporation (the “Certificate”). Upon the Conversion, outstanding options denominated in shares of Class B common stock issued under any of the Company’s equity incentive plans remained unchanged, except that such options now represent the right to receive shares of Class A common stock on exercise. In accordance with the Certificate, the shares of Class B common stock that converted to Class A common stock were retired and will not be reissued by the Company. Accordingly, the Company filed a certificate with the Secretary of State of the State of Delaware effecting the retirement of the shares of Class B common stock that were issued but no longer outstanding following the Conversion. Upon the effectiveness of the certificate, the Company’s total number of authorized shares of capital stock was reduced by the retirement of 94.1 million shares of Class B common stock. Equity Incentive Plans The Company maintains four equity incentive plans: the 2019 Equity Incentive Plan (the “2019 Plan”), 2011 Equity Incentive Plan (“2011 Plan”), Employee Stock Purchase Plan and the Signal Sciences Corp. 2014 Stock Option and Grant Plan, as amended (the “Signal Plan”). The 2019 Plan became effective in May 2019 and replaced the 2011 Plan. The Company’s 2019 Plan provides for the issuance of incentive stock options, non-statutory stock options, stock appreciation rights, restricted stock units (“RSUs”), restricted stock awards, performance-based stock awards (“PSUs”), and other forms of equity compensation, which are collectively referred to as stock awards to its employees, directors, and consultants. The Signal Plan includes 251,754 registered shares which can be exercised to purchase shares of Fastly’s common stock. As of December 31, 2023 and 2022, there were 8.9 million and 9.6 million Class A common stock available for issuance under the 2019 Plan, respectively. As of December 31, 2023 and 2022, 133.0 million and 124.3 million shares of Class A common stock were issued and outstanding, respectively. As of both December 31, 2023 and 2022, no shares of Class B common stock were issued and outstanding. Stock Options Options granted under the 2011 Plan and 2019 Plan are exercisable for Class A common stock and generally expire within 10 years from the date of grant and generally vest over four years, at the rate of 25% on the first anniversary of the date of grant and ratably on a monthly basis over the remaining 36-month period thereafter based on continued service. Due to the Conversion on July 12, 2021, options granted under the 2011 Plan are now exercisable for Class A common stock. Forfeitures are recognized as they occur. The following table summarizes stock option activity during the year ended December 31, 2023: Number of Shares Weighted-Average Weighted-Average Aggregate (in thousands) (in years) (in thousands) Outstanding at December 31, 2022 2,443 $ 6.01 4.7 $ 7,674 Granted 602 16.47 Exercised (291) 7.45 Forfeited (44) 8.41 Outstanding at December 31, 2023 2,710 $ 8.14 5.1 $ 26,383 Vested and exercisable at December 31, 2023 2,142 $ 5.94 3.8 $ 25,620 The total pre-tax intrinsic value of options exercised during the years ended December 31, 2023, 2022, and 2021 was $3.1 million, $8.9 million, and $64.9 million, respectively. The total grant date fair value of employee options vested for the years ended December 31, 2023, 2022, 2021 was $2.1 million, $5.6 million, and $6.9 million, respectively. The weighted-average grant date fair value for options granted to employees during the year ended December 31, 2023 was $10.97. The Company did not grant any options for the years ended December 31, 2022 and 2021. The Company estimates the fair value of stock options on the date of grant using the Black-Scholes option-pricing model. Each of the Black-Scholes inputs is subjective and generally requires significant judgments to determine. The Company estimated the fair value of stock option awards during the year ended December 31, 2023 on the date of the grant using the Black-Scholes option pricing model with the following weighted-average assumptions: Year ended December 31, 2023 Fair value of common stock $16.47 Expected term (in years) 5.96 Risk-free interest rate 4.67% Expected volatility 71.2% Dividend yield —% During the years ended December 31, 2023 and 2022, and 2021, the Company recognized stock-based compensation expense from stock options of approximately $2.1 million, $6.1 million, and $24.9 million, respectively. As of December 31, 2023, total unrecognized stock-based compensation cost related to outstanding unvested stock options that are expected to vest was $6.2 million. This unrecognized stock-based compensation cost is expected to be recognized over a weighted-average period of approximately 3.6 years. Early Exercise of Stock Options Certain stock options granted by the Company are exercisable at the date of grant, with unvested shares subject to repurchase by the Company in the event of voluntary or involuntary termination of employment of the stockholder. Such exercises are recorded as a liability on the accompanying consolidated balance sheets and reclassified into equity as the options vest. During the year ended December 31, 2021, the Company modified the terms of 47,882 unvested options subject to repurchase, with an exercise value of approximately $0.2 million, to become fully vested upon change in service status. As of December 31, 2021, a total of 90,977 shares of Class B Common Stock were subject to repurchase by the Company at the lower of (i) the fair market value of such shares on the date of repurchase, or (ii) the original exercise price of such shares. The corresponding exercise value of approximately $0.4 million as of December 31, 2021, was recorded in other current liabilities and other liabilities on the related consolidated balance sheets. The Company did not have any early exercise awards for the year ended December 31, 2023 and 2022. Restricted Stock Units (“RSUs”) The Company began granting RSUs under the 2019 Plan during the fiscal year ended December 31, 2019. The fair value of RSUs is based on the grant date fair value and is expensed on a straight-line basis over the applicable vesting period. RSUs granted to new hires typically vest over three three The following table summarizes RSU activity during the years ended December 31, 2023: Number of Shares Weighted-Average Grant Date Fair Value Per Share (in thousands) Nonvested RSUs as of December 31, 2022 11,990 $ 20.10 Granted 7,667 15.80 Vested (6,719) 18.94 Cancelled/forfeited (1,694) 22.80 Nonvested RSUs as of December 31, 2023 11,244 $ 17.46 During the years ended December 31, 2023, 2022 and 2021, the weighted-average grant date fair value for RSUs granted was $15.80, $14.63 and $54.92 per share, respectively. During the years ended December 31, 2023, 2022 and 2021, the total weighted-average grant date fair value of RSUs vested was $127.3 million, $97.9 million and $67.7 million, respectively. During the years ended December 31, 2023, 2022 and 2021, the Company recognized stock-based compensation expense related to RSUs of $105.2 million, $98.5 million and $78.3 million, respectively. As of December 31, 2023, total unrecognized stock-based compensation cost related to non-vested RSUs was $177.1 million. This unrecognized stock-based compensation cost is expected to be recognized over a weighted-average period of approximately 2.4 years. Stock Subject to Revest (“Revest Shares”) In conjunction with a prior acquisition in fiscal 2020, a restriction was placed on 896,499 shares belonging to the three co-founders of the target which are subject to revesting on a quarterly basis over a 2-year period. The Company did not recognize any stock-based compensation expense related to revest shares for the year ended December 31, 2023. For the year ended December 31, 2022, the Company recognized stock-based compensation expense related to revest shares of $27.6 million. As of December 31, 2023, there is no unrecognized stock-based compensation cost related to revest shares. On January 24, 2022, the Company entered into an agreement with certain holders of restricted stock, who had sold their awards in advance of their vesting conditions, in order to return the proceeds associated with the remaining 224,124 unvested shares as of December 31, 2021. These stockholders are eligible to continue vesting under the original agreements as long as they have continued service as either an employee or consultant. On January 31, 2022, the Company received $10.7 million from these stockholders related to the settlement of the matter, which the Company classified as unrestricted cash on its consolidated balance sheets. This amount will similarly be returned to the holders in accordance with the vesting under the original agreements. Correspondingly, the Company reclassified the award from equity to liability as the award will now be settled for the fixed monetary amount received, rather than a release of the restrictions on shares. The modification did not result in any incremental expense to be recognized. In February 2022, one of the stockholders had a change in employment status and the Company accelerated the remaining stock-based compensation associated with his awards on his last day of service as an employee as his services under the modified arrangement were not substantive. For the year ended December 31, 2022, the Company recognized stock-based compensation expense of $5.6 million associated with the modification of these awards, which is included in the total stock-based compensation expense. For the year ended December 31, 2023, the Company did not recognize any stock-based compensation expense associated with the modification of these awards. Performance-Based Restricted Stock Units ("PSUs") Performance stock awards for executive officers ("executive PSUs”) In February 2021, pursuant to the Company’s 2019 Equity Incentive Plan, the Company granted shares of executive PSUs to certain employees of the Company, which are to vest based on the level of achievement of certain Company and individual targets related to the Company’s operating plan for the fiscal year 2021 (“2021 Operating Plan”). In February 2022, the Company concluded that the minimum target performance to be eligible for vesting under the 2021 Operating Plan was not attained, and as such, none of the 2021 executive PSUs were eligible to vest and the awards were cancelled. In February 2022, pursuant to the Company’s 2019 Equity Incentive Plan, the Company granted certain employees shares of executive PSUs, which are to vest based on the level of achievement of certain Company-wide targets related to the Company’s operating plan for the fiscal year 2022. The Company has accounted for these awards as equity-based awards and will recognize stock-based compensation expense over the employees’ requisite service period based on the expected attainment of the Company-wide targets as of the end of each reporting period. On March 29, 2023, May 4, 2023, and May 30, 2023, pursuant to the Company’s 2019 Equity Incentive Plan, the Company granted certain employees shares of executive PSUs, which are to vest based on the level of achievement of certain Company-wide targets related to the Company’s operating plan for the fiscal year 2023. The Company has accounted for these awards as equity-based awards and will recognize stock-based compensation expense over the employees’ requisite service period based on the expected attainment of the Company-wide targets as of the end of each reporting period. Number of Shares Weighted-Average Grant Date Fair Value Per Share (in thousands) Nonvested executive PSUs as of December 31, 2022 267 $ 28.16 Granted 762 15.88 Vested (84) 28.16 Cancelled/forfeited (213) 24.35 Nonvested executive PSUs as of December 31, 2023 732 $ 16.49 For the years ended December 31, 2023, 2022 and 2021, the Company recognized $4.3 million, $1.4 million, and $3.4 million of stock-based compensation expense associated with these awards, respectively. Company-wide Bonus Program (“Bonus Program”) On February 11, 2022, the Compensation Committee approved a company-wide bonus program, including performance targets, to most of the Company’s employees on active payroll in fiscal year 2022. Shares awarded under the program were paid out in February 2023 in fully vested RSUs and based on the final attainment of Company-wide performance targets which were tied to its operating plan for fiscal year 2022. The Company recognized stock-based compensation expense over the employees requisite service period, based on the final attainment of the Company-wide targets. In February 2023, the Company paid out the bonus liability associated with the 2022 Bonus Program in 1.2 million of restricted stock units, and correspondingly recorded a charge to additional paid-in-capital of $16.6 million. On March 29, 2023, the Compensation Committee approved a company-wide bonus program, including performance targets, to most of the Company’s employees on active payroll in fiscal year 2023. Shares awarded under the program will be in fully vested RSUs and will be based on the final attainment of Company-wide performance targets which are tied to its operating plan for fiscal year 2023. The payout of the 2023 Company-wide bonus program will vary linearly between 50%, 100% and 150% based on the achievement of these targets. Employees are required to be employed through the payout date to earn the awards. The Company has accounted for these awards as liability-based awards, since the monetary value of the obligation associated with the award is based predominantly on a fixed monetary amount known at inception, and it has an unconditional obligation that it must or may settle by issuing a variable number of its equity shares. The Company is recognizing the stock-based compensation expense over the employees requisite service period, based on the expected attainment of the Company-wide targets as of the end of each reporting period. During the years ended December 31, 2023, and 2022, the Company recognized $24.7 million and $14.9 million of stock-based compensation expense associated with the Bonus Programs, respectively. The Company did not recognize any stock-based compensation expense associated with the Bonus Program for the year ended December 31, 2021. Market-Based Performance Stock Awards (“MPSUs”) In September 2022 and January 2023, pursuant to the Company’s 2019 Equity Incentive Plan, the Company granted certain employees shares of MPSUs, which are to vest upon the satisfaction of the Company’s achievement of specified Fastly Class A common stock price targets during the applicable performance period. In addition, the awards are subject to each recipient’s continuous service through each applicable vest dates. The Company measured the fair value of the MPSUs using a Monte Carlo simulation valuation model. The risk-free interest rates used were 3.37% - 3.68%, which were based on five-year US treasury yield, adjusted to a continuous time basis. The expected volatility was a blended volatility rate of 80%, which incorporated both the Company’s observed equity volatility and the relevant guideline company volatility. Number of Shares Weighted-Average Grant Date Fair Value Per Share (in thousands) Nonvested MPSUs as of December 31, 2022 2,174 $ 6.80 Granted 87 7.25 Vested (540) 7.84 Cancelled/forfeited (250) 6.69 Nonvested MPSUs as of December 31, 2023 1,471 $ 6.46 Stock-based compensation expense relating to the MPSUs are recognized using the accelerated attribution method over the derived service period. For the year ended December 31, 2023, the Company recognized $5.9 million of stock-based compensation expense associated with these awards. Total unrecognized stock-based compensation expense related to the unvested portion of the MPSUs was $4.7 million as of December 31, 2023. This expense is expected to be amortized over a weighted-average vesting period of 3.9 years. Employee Stock Purchase Program (“ESPP”) The ESPP allows eligible employees to purchase shares of the Company’s Class A common stock through payroll deductions of up to 15% of their eligible compensation. The ESPP provides for six-month offering periods, commencing in May and November of each year. At the end of each offering period employees are able to purchase shares at 85% of the lower of the fair market value of the Company’s Class A common stock on the first trading day of the offering period or on the date of purchase. The Company estimates the fair value of shares to be issued under the ESPP on the first day of the offering period using the Black-Scholes valuation model. The inputs to the Black-Scholes option pricing model are the Company’s stock price on the first date of the offering period, the risk-free interest rate, the estimated volatility of the Company’s stock price over the term of the offering period, the expected term of the offering period and the expected dividend rate. Stock-based compensation expense related to the ESPP is recognized on a straight-line basis over the offering period. Forfeitures are recognized as they occur. The Company estimated the fair value of shares granted under the ESPP on the first date of the offering period using the Black-Scholes option pricing model with the following assumptions: Year ended December 31, 2023 2022 2021 Fair value of common stock $3.33 – $6.09 $8.40 – $11.85 $41.24 – $44.87 Expected term (in years) 0.49 – 0.50 0.49 0.49 – 0.50 Risk-free interest rate 4.65% – 5.43% 1.57% – 4.65% 0.02% – 0.07% Expected volatility 70% – 88% 88% – 101% 47% – 58% Dividend yield — % — % — % During the years ended December 31, 2023, 2022 and 2021, the Company recognized $4.1 million, $3.2 million, and $3.5 million in stock-based compensation expense related to the ESPP, respectively. As of December 31, 2023, total unrecognized stock-based compensation cost related to ESPP was $1.9 million. This unrecognized stock-based compensation cost is expected to be recognized over a weighted-average period of approximately 0.4 years. During the years ended December 31, 2023, 2022 and 2021, an aggregate of 1.0 million and 0.5 million and 0.2 million shares of the Company’s Class A common stock was purchased under the ESPP, respectively. Equity Awards Modification In September 2023, as part of one employee's separation and transition plan, the Company modified this employee’s outstanding equity awards in an amount that would have vested if this individual had remained an employee for an additional period of time. As a result of the modification, the Company recognized stock-based compensation expense of $2.0 million for the year ended December 31, 2023. In September 2022, as part of one employee's separation and transition plan, the Company modified this employee’s outstanding equity awards in an amount that would have vested if this individual had remained an employee for an additional period of time. As a result of the modification, the Company recognized stock-based compensation expense of $3.1 million for the year ended December 31, 2022. Stock-based Compensation Expense The following table summarizes the components of total stock-based compensation expense included in the accompanying consolidated statements of operations: Year ended December 31, 2023 2022 2021 (in thousands) Cost of revenue $ 11,656 $ 12,050 $ 7,227 Research and development 47,827 58,435 47,019 Sales and marketing 33,703 39,083 31,159 General and administrative 43,117 36,228 55,083 Total $ 136,303 $ 145,796 $ 140,488 For the years ended December 31, 2023, 2022 and 2021, the Company capitalized $10.1 million, $8.0 million, and $4.4 million of stock-based compensation expense, respectively. For the year ended December 31, 2023, the Company recognized $24.7 million of stock-based compensation expense associated with liability classified awards related to the company-wide Bonus Program. For the year ended December 31, 2022, the Company recognized $25.5 million of stock-based compensation expense associated with liability classified awards related to the company-wide Bonus Program and certain of the Company’s Revest Shares that were modified. The Company did not recognize any stock-based compensation expense associated with liability classified awards for the year ended December 31, 2021.

Net Loss Per Share Attributable

Net Loss Per Share Attributable to Common Stockholders	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Net Loss Per Share Attributable to Common Stockholders	Net Loss Per Share Attributable to Common Stockholders Basic net loss per share is computed by dividing net loss by basic weighted-average shares outstanding during the period. Diluted net loss per share is computed by dividing net loss by diluted weighted-average shares outstanding, including potentially dilutive securities. On July 12, 2021, the shares of Class B common stock that converted to Class A common stock were retired and will not be reissued by the Company. Prior to that date, the Company computed net loss per share using the two-class method required for multiple classes of common stock and participating securities. The rights of the holders of the Class A common stock and Class B common stock are identical, except with respect to voting and conversion. Accordingly, the Class A common stock and Class B common stock share equally in the Company’s net losses. The following table presents the computation of basic and diluted net loss per share of common stock (in millions, except per share data): Year ended December 31, 2023 2022 2021 Class A (1) Class B (2) Class A (1) Class B (2) Class A (1) Class B (2) (in thousands, except per share amounts) Net loss attributable to common stockholders $ (133,088) $ — $ (190,774) $ — $ (212,120) $ (10,577) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 128,770 — 121,723 — 110,541 5,512 Net loss per share attributable to common stockholders, basic and diluted $ (1.03) $ — $ (1.57) $ — (1.92) $ (1.92) __________ (1) Class A common stock includes the issuance of 12.9 million shares of Class A common stock issued by the Company in connection with the IPO and the shares issued in connection with the follow-on offering on May 26, 2020. It also includes shares issued upon the exercise of options and vesting of RSUs granted subsequent to the IPO, shares issued as part of the prior acquisitions, and converted Common B shares. (2) Class B common stock includes, for all periods presented, common stock issued prior to the IPO and the conversion of all of the Company’s preferred stock into an aggregate of 53.6 million shares of the Company’s Class B common stock upon closing of the IPO. Some of these shares were previously converted into shares of Class A common stock. On July 12, 2021, all shares of Class B common stock were converted into shares of Class A common stock. The following securities were excluded from the computation of diluted net loss per share of common stock for the periods presented as their effect would have been antidilutive: Number of Shares Year ended December 31, 2023 2022 2021 (in thousands) Stock options 2,710 2,443 4,369 RSUs 11,244 11,990 5,285 Revest shares — — 336 PSUs 732 267 71 MPSUs 1,471 2,174 — Bonus PSUs 1,572 1,777 — Shares issuable pursuant to the ESPP 410 186 51 Convertible senior notes (if-converted) 3,370 7,338 9,229 Total 21,509 26,175 19,341

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Loss before income ta xes includes the following components: Year ended December 31, 2023 2022 2021 (in thousands) United States $ (137,240) $ (196,469) $ (224,159) Foreign 3,931 5,789 1,531 Loss before income taxes $ (133,309) $ (190,680) $ (222,628) The income tax expense (benefit) consists of the following: Year ended December 31, 2023 2022 2021 (in thousands) Current tax provision (benefit): Federal $ — $ — $ — State 57 (79) — Foreign 622 173 322 Deferred tax benefit: Federal — — (253) State — — — Foreign (900) — — Total tax expense (benefit) $ (221) $ 94 $ 69 Reconciliation between the Company’s effective tax rate on income from continuing operations and the U.S. federal statutory rate is as follows: Year ended December 31, 2023 2022 2021 Provision at federal statutory tax rate 21 % 21 % 21 % Change in valuation allowance (25) (14) (30) Foreign tax rate differential 1 — — Stock-based compensation (4) (9) 2 Research and development credits 10 2 5 Disallowed executive compensation (3) — — Restructuring — — 2 Effective tax rate — % — % — % The Company recorded tax benefit of $0.2 million for the year ended December 31, 2023 and recorded tax expense of $0.1 million for both the years ended December 31, 2022 and 2021. The Company’s income tax expense (benefit) is primarily due to income taxes from certain foreign jurisdictions where the Company conducts business and state minimum income taxes in the United States. The Company’s deferred tax assets and liabilities were as follows: Year ended December 31, 2023 2022 (in thousands) Deferred tax assets: Net operating losses $ 178,149 $ 183,306 Lease liability 20,137 23,245 Research and development credits 38,280 21,383 Capitalized research and development 45,418 21,032 Stock-based compensation 11,765 10,429 Deferred revenue 4,934 2,811 Reserves and accruals 4,336 4,648 Other 1,889 4,179 Deferred tax assets 304,908 271,033 Intangible asset amortization (16,310) (21,713) Right-of-use asset (15,322) (18,847) State taxes (13,032) (10,732) Prepaid commissions (13,868) (11,526) Deferred tax liabilities (58,532) (62,818) Valuation allowance (245,476) (208,215) Net deferred tax (liabilities) assets $ 900 $ — As of December 31, 2023 and 2022 , t he Company had NOL carryforwards for U.S. federal income tax purposes of approximately $626.4 million and $658.8 million, respectively; and for state income tax purposes of approximately $568.3 million and $528.9 million, respectively. The federal NOL carryforwards, if not utilized, will begin to expire in 2035. The state NOL carryforward, if not utilized, will begin to expire on various dates starting in 2024. The Company also has federal and California research and development credit carryforwards totaling $42.1 million and $12.2 million as of December 31, 2023, respectively. The federal research and development credit carryforwards will begin to expire in 2033, unless previously utilized. The California research credits do not expire. As of December 31, 2023, the Company has NOL carryforwards for United Kingdom purposes of approximately $27.9 million. The UK NOL carryforwards do not expire. Based on all available evidence on a jurisdictional basis t he Company believes that it is more likely than not that the Company’s U.S. deferred tax assets will not be utilized and have recorded a full valuation allowance against its U.S. net deferred tax assets. The Company assesses on a periodic basis the likelihood that it will be able to recover its deferred tax assets. The Company considers all available evidence, both positive and negative, including historical losses. The Company determined that it is more likely than not that the U.S. net deferred tax assets will not be fully realizable for the years ended December 31, 2023 and 2022. T he Company has a valuation allowance for U.S. deferred tax assets, including NOL carryforwards. The Company expects to maintain this valuation allowance for the foreseeable future. During the year ended December 31, 2023, the valuation allowance related to the Company’s U.S. deferred tax assets increased by $37.3 million. Utilization of the net operating loss carryforwards may be subject to a substantial annual limitation due to the ownership change limitations under the Code and similar state provisions. Under Section 382 of the Code, a corporation that undergoes an “ownership change” may be subject to limitations on its ability to utilize its pre-change NOLs to offset future taxable income. A detailed analysis was performed through December 31, 2021 for the Company to determine whether an ownership change under Section 382 of the Code has occurred, and ownership changes were identified in 2013 and 2020. As a result of this analysis, the Company concluded that there is no longer any limitation on the utilization of such NOLs. A detailed analysis was performed for the period March 1, 2014 to October 1, 2020 for Signal Sciences to determine whether an ownership change under Section 382 of the Code has occurred and an ownership change was identified in 2020. As a result of this analysis, the Company concluded that there is no longer any limitation on its utilization of the NOLs of Signal Sciences. No provision for U.S. income and foreign withholding taxes has been made for these permanently reinvested foreign earnings because it is management’s intention to permanently reinvest such undistributed earnings outside the United States. A reconciliation of the Company’s unrecognized tax benefits is as follows (in thousands): Year ended December 31, 2023 2022 Balance at beginning of year $ 17,337 $ 7,808 Increases related to prior year tax positions 2,674 8,697 Decreases related to prior year tax positions — (751) Increases related to current year tax positions 3,234 1,583 Balance at end of year $ 23,245 $ 17,337 The Company has considered the amounts and probabilities of the outcomes that can be realized upon ultimate settlement with the tax authorities and determined unrecognized tax benefits primarily related to credits should be established as noted in the summary rollforward above. The unrecognized tax benefits, if recognized and in absence of full valuation allowance, would impact the income tax provision by $23.2 million and $17.3 million at December 31, 2023 and 2022, respectively. As of December 31, 2023, the Company does not believe that it is reasonably possible that its unrecognized tax benefits would significantly change in the following 12 months. The Company’s policy is to recognize interest and penalties associated with uncertain tax benefits as part of the income tax provision and include accrued interest and penalties with the related income tax liability on its consolidated balance sheet. To date, t he Company has not recognized any interest and penalties in its consolidated statements of operations, nor has it accrued for or made payments for interest and penalties. Generally, in the U.S. federal and state taxing jurisdictions, tax periods in which certain loss and credit carryovers are generated remain open for audit until such time as the limitation period ends for the year in which such losses or credits are utilized.

Information About Revenue and G

Information About Revenue and Geographic Areas	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Information About Revenue and Geographic Areas	Information About Revenue and Geographic Areas Revenue Revenue by geography is based on the billing address of the customer. Refer to Note 3—Revenue for more information on net revenue by geographic area. Long-Lived Assets The Company’s property and equipment and operating lease right-of-use assets, each net, by geographic area were as follows: As of December 31, 2023 2022 (in thousands) United States $ 166,413 $ 175,794 All other countries 65,407 73,024 Total long-lived assets $ 231,820 $ 248,818

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On February 16, 2024, the Company entered into the Second Amendment to Credit Agreement with the Lenders and Silicon Valley Bank, a division of First-Citizens Bank & Trust Company, as a lender and as administrative agent and collateral agent for the Lenders, which, among other things, extended the maturity date of the loans under the Credit Agreement to June 14, 2024.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net loss	$ (133,088)	$ (190,774)	$ (222,697)

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended	12 Months Ended
	Dec. 31, 2023 shares	Dec. 31, 2023 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		During the Company’s last fiscal quarter, the Company’s directors and officers (as defined in Rule 16a-1(f) under the Exchange Act) adopted or terminated the contracts, instructions or written plans for the purchase or sale of the Company’s securities set forth in the table below. Type of Trading Arrangement Name and Position Action Adoption/ Termination Date Rule 10b5-1* Non- Rule 10b5-1** Total Shares of Class A Common Stock to be Sold Total Shares of Class A Common Stock to be Purchased Expiration Date Ronald Kisling, Chief Financial Officer (1) Adoption 11/20/2023 X — 163,938 — 12/31/2024 Richard Daniels, Director (2) Adoption 11/17/2023 X — 7,766 — 03/29/2024 Brett Shirk, former Chief Revenue Officer (3) Termination 12/20/2023 X — — — 12/31/2024 * Contract, instruction or written plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act. ** “Non-Rule 10b5-1 trading arrangement” as defined in Item 408(c) of Regulation S-K under the Exchange Act. (1) Ronald Kisling, our Chief Financial Officer, adopted a Rule 10b5-1 Plan on November 20, 2023. Mr. Kisling's plan provides for the potential sale of up to 163,938 shares of the Company’s Class A Common Stock, plus any shares that are granted to him in 2024 relating to the 2023 company-wide Bonus Program; provided, however, because certain of Mr. Kisling’s planned sale amounts are equal to a designated percentage of the net number of shares resulting from RSUs vesting, of which a portion will be surrendered to the Company or sold to cover withholding taxes, depending on how many shares are withheld in these instances, the maximum number of shares to be sold may be less. The plan expires on December 31, 2024, or upon the earlier completion of all authorized transactions under the plan. (2) Richard Daniels, a member of our board of directors, adopted a Rule 10b5-1 Plan on November 17, 2023. Mr. Daniels' plan provides for the potential sale of up to 7,766 shares of the Company’s Class A Common Stock; provided, however, because certain of Mr. Daniels' planned sale amounts are equal to a designated percentage of the net number of shares resulting from RSUs vesting, of which a portion will be surrendered to the Company or sold to cover withholding taxes, depending on how many shares are withheld in these instances, the maximum number of shares to be sold may be less. The plan expires on March 29, 2024, or upon the earlier completion of all authorized transactions under the plan. (3) Brett Shirk, our former Chief Revenue Officer, on December 20th, 2023, terminated a Rule 10b5-1 Plan entered into on August 21, 2023 in connection with his departure.
Non-Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Terminated	false
Ronald Kisling [Member]
Trading Arrangements, by Individual
Name	Ronald Kisling
Title	Chief Financial Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	11/20/2023
Arrangement Duration	407 days
Aggregate Available	163,938	163,938
Richard Daniels [Member]
Trading Arrangements, by Individual
Name	Richard Daniels
Title	Director
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	11/17/2023
Arrangement Duration	133 days
Aggregate Available	7,766	7,766
Brett Shirk [Member]
Trading Arrangements, by Individual
Name	Brett Shirk
Title	former Chief Revenue Officer
Rule 10b5-1 Arrangement Terminated	true
Termination Date	12/20/2023
Arrangement Duration	377 days
Aggregate Available	0	0

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation
Principles of Consolidation	The accompanying consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.
Reclassification	Certain changes to presentation have been made to conform the prior period presentation to the current period reporting. The Company has made certain presentation changes to consolidate the interest paid on finance lease line into other liabilities working capital changes and components of the non-cash lease expense related to operating lease liability changes into operating lease liability working capital changes within operating cash flows in the consolidated statements of cash flows. Such reclassifications did not affect the consolidated balance sheets, total revenues, operating income, net income, or cash flows from operating, investing or financing activities.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates, judgments, and assumptions that affect the reported amounts of assets, liabilities, revenue, costs and expenses, and related disclosures. Actual results and outcomes could differ significantly from the Company’s estimates, judgments, and assumptions. Significant estimates, judgments, and assumptions used in these financial statements include, but are not limited to, those related to revenue, accounts receivable and related reserves, internal-use software development costs, the incremental borrowing rate related to the Company’s lease liabilities, fair value of assets acquired and liabilities assumed during business combinations, useful lives of acquired intangible assets and property and equipment, fair value of the Company’s long-lived assets as well as reporting unit, income tax reserves, and accounting for stock-based compensation. Estimates are periodically reviewed in light of changes in circumstances, facts, and experience. The effects of material revisions in estimates are reflected in the consolidated financial statements in the period of change and prospectively from the date of the change in estimate.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash, cash equivalents, marketable securities and accounts receivable. The Company’s cash, cash equivalents, and marketable securities primarily consisted of bank deposits, money market funds, investment-grade commercial paper, corporate notes and bonds, U.S. treasury securities, agency bonds, municipal securities, foreign government and supranational securities and asset-backed securities held at major financial institutions that the Company believes to be of high credit standing. The primary focus of its investment strategy is to preserve capital and meet liquidity requirements. The Company’s investment policy limits the amount of credit exposure with any one financial institution or commercial issuer. The Company maintains deposits in federally insured financial institutions in excess of federally insured limits. The Company is exposed to credit risk in the event of default by the financial institutions holding its cash and cash equivalents to the extent recorded in the balance sheets. While the Company has not experienced any losses in such accounts and the Company has historically maintained its cash in multiple financial institutions, the failure of Silicon Valley Bank (“SVB”) in March 2023, at which the Company held cash and cash equivalents in multiple accounts, exposed the Company to limited credit risk prior to the completion by the Federal Deposit Insurance Corporation (“FDIC”) of the resolution of SVB in a manner that fully protected all depositors.
Cash, Cash Equivalents	Cash, Cash Equivalents and Marketable Securities Cash and cash equivalents include cash held in banks, highly liquid money market funds, U.S. treasury securities and commercial paper, all with original maturities of three months or less when acquired. The Company’s short-term and long-term marketable securities consists of fixed income U.S. and foreign government agency securities, corporate bonds, agency bonds, asset-backed securities and commercial paper. Management determines the appropriate classification of the Company’s investments at the time of purchase and reevaluates such designation at each balance sheet date. The Company classifies its marketable securities as either short-term or long-term based on each instrument’s underlying remaining contractual maturity date. The Company classifies its marketable securities as available-for-sale as it has the ability to sell the marketable securities prior to its maturity. The Company’s marketable securities are reported at fair value with unrealized gains and losses reported, net of tax, as a separate component of accumulated other comprehensive income (loss) in stockholders’ equity. Cash and cash equivalents are stated at cost, which approximate fair market value. Short-term and long-term marketable securities are classified as available-for-sale debt securities and are also carried at fair market value. When the available-for-sale debt securities are sold, cost is based on the specific identification method, and the realized gains and losses are included in other income (expense), net in the consolidated statements of operations. The Company evaluates its investments periodically for possible other-than-temporary impairment. A decline in fair value below the amortized costs of its available-for-sale debt securities is considered an other-than-temporary impairment if the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of the entire amortized cost basis. Otherwise, the credit loss component of the impairment is recorded as allowance for credit losses with an offsetting entry charged to other income (expense), net, while the remaining loss is recognized in other comprehensive income (loss).
Marketable Securities	Cash, Cash Equivalents and Marketable Securities Cash and cash equivalents include cash held in banks, highly liquid money market funds, U.S. treasury securities and commercial paper, all with original maturities of three months or less when acquired. The Company’s short-term and long-term marketable securities consists of fixed income U.S. and foreign government agency securities, corporate bonds, agency bonds, asset-backed securities and commercial paper. Management determines the appropriate classification of the Company’s investments at the time of purchase and reevaluates such designation at each balance sheet date. The Company classifies its marketable securities as either short-term or long-term based on each instrument’s underlying remaining contractual maturity date. The Company classifies its marketable securities as available-for-sale as it has the ability to sell the marketable securities prior to its maturity. The Company’s marketable securities are reported at fair value with unrealized gains and losses reported, net of tax, as a separate component of accumulated other comprehensive income (loss) in stockholders’ equity. Cash and cash equivalents are stated at cost, which approximate fair market value. Short-term and long-term marketable securities are classified as available-for-sale debt securities and are also carried at fair market value. When the available-for-sale debt securities are sold, cost is based on the specific identification method, and the realized gains and losses are included in other income (expense), net in the consolidated statements of operations. The Company evaluates its investments periodically for possible other-than-temporary impairment. A decline in fair value below the amortized costs of its available-for-sale debt securities is considered an other-than-temporary impairment if the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of the entire amortized cost basis. Otherwise, the credit loss component of the impairment is recorded as allowance for credit losses with an offsetting entry charged to other income (expense), net, while the remaining loss is recognized in other comprehensive income (loss).
Restricted Cash	Restricted Cash
Accounts Receivable, net	Accounts Receivable, net Accounts receivable are recorded and carried at the original invoiced amount, net of an allowance for any potential credit losses. The allowance for credit losses is determined based upon the assessment of various factors, such as historical experience, credit quality of its customers, age of the accounts receivable balances, geographic related risks, economic conditions, and other factors that may affect a customer’s ability to pay. The Company records these charges as a component of general and administrative expenses in the consolidated statements of operations in the period in which the change occurs. The Company does not have any off-balance sheet credit exposure related to its customers.
Incremental Costs to Obtain a Contract with a Customer and Revenue Recognition	Incremental Costs to Obtain a Contract with a Customer The Company capitalizes incremental costs associated with obtaining customer contracts, specifically certain commission payments. The Company pays commissions based on contract value upon signing a new arrangement with a customer and upon renewal and upgrades of existing contracts with customers only if the renewal and upgrades result in an incremental increase in contract value. These costs are deferred on the consolidated balance sheets and amortized over the expected period of benefit on a straight-line basis. The Company also pays commissions on an ongoing basis based upon revenue recognized. In these cases, no incremental costs are deferred, as the commissions are earned and expensed in the same period for which the associated revenue is recognized. Based on the nature of the Company’s technology and services, and the duration of its relationships with its customers, the expected period of benefit is determined to be five years. Amortization is primarily included in sales and marketing expense in the consolidated statements of operations. Deferred commission and incentive payments are included in other assets on the consolidated balance sheets. Revenue recognition The Company primarily derives revenue from the sale of services to customers executing contracts in which the standard contract term is one year, although terms may vary by contract. Most of the Company’s contracts are non-cancelable over the contractual term. The majority of the Company’s usage-based contracts commit the customer to a minimum monthly level of usage and specify the rate at which the customer must pay for actual usage above the monthly minimum. The Company also offers subscriptions to access a unified security web application and application programming interface at a fixed rate. The Company recognizes revenue in accordance with Accounting Standards Codification (“ASC”) 606, where revenue is recognized upon transfer of control of promised products or services to customers in an amount that reflects the consideration the Company expects to receive in exchange for those products or services. The processing and recording of certain revenue requires a manual process, which uses a complex set of procedures to generate complete and accurate data to record these revenue transactions. The Company enters into contracts that can include various combinations of products and services, each of which are distinct and accounted for as separate performance obligations. Revenue is recognized net of any taxes collected from customers, which are subsequently remitted to governmental authorities. The Company’s contracts with customers often include promises to transfer multiple products and services to a customer. Determining whether products and services are considered distinct performance obligations that should be accounted for separately versus together may require significant judgment. Performance obligations generally represent stand-ready obligations that are satisfied over time as the customer simultaneously receives and consumes the benefits provided by the Company. These obligations can be network services, security, compute, professional services, support, and other edge cloud platform services. Accordingly, the Company’s revenue is recognized over time, consistent with the pattern of benefit provided to the customer over the term of the agreement. For contracts with multiple performance obligations that are delivered over different time periods, the Company allocates the contract transaction price to each performance obligation using the estimated standalone selling price ( “ SSP”) of each distinct good or service in the contract. Judgment is required to determine the SSP for each distinct performance obligation. The Company analyzes separate sales of its products and services or the discounted list price per management’s approved price list as a basis for estimating the SSP of these products and services. In instances where SSP is not directly observable, such as when the Company does not sell the product or service separately, the Company determines the SSP using information that may include market conditions and other observable inputs. The Company typically has more than one SSP for individual products and services due to the stratification of those products and services by customers and circumstances. In these instances, the Company may use information, such as geographic region and distribution channel, in determining the SSP. The transaction price in a contract for usage-based services is typically equal to the minimum commit price in the contract plus any variable amounts of usage above the minimum commitment, less any discounts provided. The transaction price in a contract that does not contain usage-based services is equal to the total contract value. Because the Company’s typical contracts represent distinct services delivered over time with the same pattern of transfer to the customer, usage-based consideration primarily related to actual consumption over the minimum commit levels is allocated to the period to which it relates. The amount of consideration recognized for usage above the minimum commit price is limited to the amount the Company expects to be entitled to receive in exchange for providing services. The Company has elected to apply the practical expedient for estimating and disclosing the variable consideration when variable consideration is allocated entirely to a wholly unsatisfied performance obligation or to a wholly unsatisfied promise to transfer a distinct good or service that forms part of a single performance obligation from its remaining performance obligations under these contracts. For contracts to which such practical expedient cannot be applied, consideration is estimated. For custom arrangements, other methods may be used as a measure of progress towards satisfying the performance obligations. Revenue on the Company’s subscription services are recognized ratably over their respective contractual term. At times, customers may request changes that either amend, replace, or cancel existing contracts. Judgment is required to determine whether the specific facts and circumstances within the contracts should be accounted for as a separate contract or as a prospective modification. In contracts where there are timing differences between when the Company transfers a promised good or service to the customer and when the customer pays for that good or service, the Company has determined its contracts do not include a significant financing component. The Company has also elected the practical expedient to not measure financing components for any contract where the timing difference is less than one year.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company’s available-for-sale securities are recorded at fair value. The Company’s cash and cash equivalents and restricted cash are recorded at cost, which approximates fair value. Additionally, accounts receivable, accounts payable, and accrued expenses approximate fair value due to their short-term nature. For disclosure purposes, the Company measures the fair value of its outstanding senior convertible notes using a market approach based on actual bids and offers in an over-the-counter market, or Level 2 inputs, on the last trading day of the period.
Property and Equipment	Property and Equipment Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed on a straight-line basis over the estimated useful lives of the assets. The estimated useful life of each asset category is as follows: Computer and networking equipment 3 to 5 years Leasehold improvements Shorter of lease term or 5 years Furniture and fixtures 3 years Office equipment 3 years Internal-use software 3 to 5 years The Company periodically reviews the estimated useful lives of property and equipment and any changes to the estimated useful lives are recorded prospectively from the date of the change. Upon retirement or sale, the cost of the assets disposed of and the related accumulated depreciation are removed from the accounts, and any resulting gain or loss is included in the consolidated statements of operations. Repairs and maintenance costs are expensed as incurred.
Internal-Use Software Development Costs	Internal-Use Software Development Costs Labor and related costs associated with internal-use software incurred during the application development stage are capitalized. Capitalization of costs begins when the preliminary project stage is completed, management has committed to funding the project, and it is probable that the project will be completed and the software will be used to perform the function intended. Capitalization ceases at the point when the project is fully tested, is substantially completed and is ready for its intended purpose. The capitalized amounts are included in property and equipment, net on the consolidated balance sheets. The Company amortizes such costs on a straight-line basis over the estimated useful life of the software, which is generally three estimated useful life. Costs incurred during the planning, training, and post-implementation stages of the software development life-cycle are expensed as incurred.
Business Combinations	Business Combinations The Company accounts for its acquisitions using the acquisition method of accounting, which requires, among other things, allocation of the fair value of purchase consideration to the tangible and intangible assets acquired and liabilities assumed at their estimated fair values on the acquisition date. The excess of the fair value of purchase consideration over the values of these identifiable assets and liabilities is recorded as goodwill. Determining the fair value of assets acquired and liabilities assumed requires significant judgment and estimates including the selection of valuation methodologies, future expected cash flows, discount rates, and useful lives. The Company’s estimates of fair value are based on assumptions believed to be reasonable, but which are inherently uncertain and, as a result, actual results may differ from estimates. During the measurement period, not to exceed one year from the date of acquisition, the Company may record adjustments to the assets acquired and liabilities assumed with a corresponding offset to goodwill to reflect new information obtained about facts and circumstances that existed as of the acquisition date. At the conclusion of the measurement period, or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are reflected in the consolidated statements of operations. Transaction costs associated with business combinations are expensed as incurred, and are included in general and administrative expense in the consolidated statements of operations.
Segments	Segments The Company considers operating segments to be components of the Company in which separate financial information is available and is evaluated regularly by the Company’s Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources and in assessing performance. The CODM is the Chief Executive Officer (“CEO”). The CEO reviews financial information presented on a consolidated basis, accompanied by information about revenue, customer size, and industry vertical for purposes of allocating resources and evaluating financial performance. The Company has determined that it is organized as a single operating segment with no segment managers who are held accountable for operations, operating results, or plans for levels or components below the consolidated unit level. Accordingly, the Company has determined that it has a single reportable segment and operating segment.
Goodwill, Intangible Assets, and Other Long-Lived Assets	Goodwill, Intangible Assets and Other Long-Lived Assets Goodwill represents the excess of the purchase price of an acquired business over the fair value of the net tangible and identifiable intangible assets acquired. The carrying amount of goodwill is reviewed for impairment at least annually, in the fourth quarter, or whenever events or changes in circumstances indicate that the carrying value may not be recoverable. The Company has a single operating segment and reporting unit structure for all of the periods presented. As part of the annual goodwill impairment test, the Company first performs a qualitative assessment to determine whether further impairment testing is necessary. If, as a result of the qualitative assessment, it is more likely than not that the fair value of the reporting unit is less than its carrying amount, the quantitative impairment test will be required. If the Company has determined it necessary to perform a quantitative impairment assessment, the Company will compare the fair value of the reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, limited to the total amount of goodwill of the reporting unit. The Company did not recognize any goodwill impairment charges for any of the periods presented. The Company’s definite lived intangible assets are carried at cost, net of accumulated amortization. Intangible assets are amortized on a straight-line basis over their estimated useful lives. The Company estimates the useful life by estimating the expected period of economic benefit. The useful lives of the intangible assets are as follows: Customer relationships 3 to 8 years Developed technology 4 to 5 years Trade names 3 to 4 years Backlog 2 years Internet protocol addresses 10 years In-process research and development (“IPR&D”) Indefinite Long-lived assets, including property and equipment, definite lived intangible assets, and operating lease right-of-use assets, are reviewed for impairment whenever events or changes in circumstances, such as service discontinuance, technological obsolescence, significant decreases in market capitalization, facility closures, or work-force reductions indicate that the carrying amount of the long-lived asset or asset group may not be recoverable. When such events occur, the Company compares the carrying amount of the asset or asset group to the undiscounted expected future cash flows related to the asset or asset group. If this comparison indicates that an impairment is present, the amount of impairment is calculate as the difference between the carrying amount and the fair value of the asset or asset group. The Company’s indefinite lived intangibles are assessed annually for impairment. In addition to the recoverability assessment, the Company periodically reviews the remaining estimated useful lives of long-lived assets. If the estimated useful life assumption for any asset is changed due to new information, the remaining unamortized balance would be depreciated or amortized over the revised estimated useful life, on a prospective basis. Refer to Note 6 — Balance Sheet Information and Note 7 — Leases for discussion of impairment of property and equipment and impairment of operating lease right-of-use asset, respectively.
Leases	Leases The Company leases office space and data centers (“colocation leases”) under non-cancelable operating leases with various expiration dates. The Company also leases server equipment under non-cancelable finance leases with various expiration dates. The Company determines if an arrangement contains a lease at inception. Operating lease right-of-use assets and lease liabilities are recognized at the present value of the future lease payments at commencement date. The interest rate implicit in the Company’s operating leases is not readily determinable, and therefore an incremental borrowing rate is estimated to determine the present value of future payments. The estimated incremental borrowing rate factors in a hypothetical interest rate on a collateralized basis with similar terms, payments, and economic environments. Operating lease right-of-use assets also include any prepaid lease payments and exclude lease incentives. Operating lease expense is recognized on a straight-line basis over the lease term commencing on the date the Company has the right to use the leased property. The lease terms may include options to extend or terminate the lease. The Company generally uses the base, non-cancelable, lease term when recognizing the lease assets and liabilities, unless it is reasonably certain that the option will be exercised. The lease agreements may contain variable costs such as common area maintenance, operating expenses or other costs. Variable lease costs are expensed as incurred on the consolidated statements of operations. The Company’s lease agreements generally do not contain any residual value guarantees or restrictive covenants. Certain of our operating leases contain both lease and non-lease components. Non-lease components for our office spaces include fixed payments for maintenance, utilities, real estate taxes, and management fees. Non-lease components for colocation leases include fixed payments for utilities and other operating costs. For both office spaces and colocation leases, the Company combines fixed lease and non-lease components and account for them as a single lease component. The Company leases networking equipment from a third party, through equipment finance leases. These leases include a bargain purchase option, resulting in a full transfer of ownership at the completion of the lease term. Operating leases are reflected in operating lease right-of-use assets, operating lease liabilities, and operating lease liabilities, non-current on the consolidated balance sheets. Finance leases are included in property and equipment, net, finance lease liabilities, and finance lease liabilities, non-current on the consolidated balance sheets.
Convertible Debt	Convertible Debt The Company evaluated the terms of its debt in line with Accounting Standards Update (“ASU”) 2020-06 and concluded that the instrument does not require separation and that there were no other derivatives that required separation. The Company has combined these features with the host contract and accounted for the convertible debt as a single liability in long-term debt on the consolidated balance sheets. The carrying amount of the liability is based on the gross proceeds, net of the unamortized transaction costs incurred related to the issuance of the convertible debt instrument, and the partial repurchases made in 2022 and 2023. The debt discount from the net unamortized transaction cost is amortized to interest expense over the term of the convertible debt instrument using the effective interest rate method.
Cost of Revenue	Cost of Revenue Cost of revenue consists primarily of fees paid to network providers for bandwidth and to third-party network data centers for housing servers, also known as colocation costs. Cost of revenue also includes employee costs for network operation, build-out and support and services delivery, network storage costs, cost of managed services and software-as-a-service, depreciation of network equipment used to deliver services, and amortization of network-related internal-use software. The Company enters into contracts for bandwidth with third-party network providers with terms of typically one year. These contracts generally commit the Company to pay minimum monthly fees plus additional fees for bandwidth usage above the committed level. The Company enters into contracts for colocation services with third-party providers with terms typically ranging from one
Research and Development Costs	Research and Development Costs Research and development costs consist of primarily payroll and related personnel costs for the design, development, testing, and enhancement of the Company’s edge cloud platform. Research and development expenses also include cloud infrastructure fees for development and testing. Costs incurred in the development of the Company’s edge cloud platform are expensed as incurred, excluding those expenses which meet the criteria for the capitalization of internal-use software.
Advertising Expense	Advertising Expense
Accounting for Stock-Based Compensation	Accounting for Stock-Based Compensation The Company recognizes stock-based compensation expense based on the grant-date fair value of the awards. The fair values of the restricted stock units (“RSUs”), restricted stock awards (“RSAs”) and performance stock awards (“PSUs”) are based on the fair value of the Company’s stock price on the grant date. The fair values of stock options and ESPP are based on the Black-Scholes option-pricing model. The fair value of the market-based performance stock awards (“MPSUs”) is measured using a Monte Carlo simulation valuation model. The determination of the fair value of a stock-based award is affected by the deemed fair value of the underlying stock price on the grant date, as well as assumptions regarding a number of other complex and subjective variables, including expected term and stock price volatility of the awards. three
Foreign Currency	Foreign Currency
Income Taxes	Income Taxes The Company accounts for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, the Company determines deferred tax assets and liabilities on the basis of the differences between the financial statement and tax bases of assets and liabilities by using enacted tax rates for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. The Company recognizes deferred tax assets to the extent that it believes that these assets are more likely than not to be realized. In making such a determination, the Company considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. If the Company determines that it would be able to realize its deferred tax assets in the future in excess of their net recorded amount, the Company would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes. The Company records uncertain tax positions in accordance with ASC 740 on the basis of a two-step process in which (1) it determines whether it is more likely than not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, the Company recognizes the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority. The Company recognizes interest and penalties related to unrecognized tax benefits on the income tax expense line in the accompanying consolidated statement of operations and consolidated statement of comprehensive loss. Accrued interest and penalties are included in accrued expenses on the consolidated balance sheet.
Net Loss Per Share Attributable to Common Stockholders	Net Loss Per Share Attributable to Common Stockholders Basic and diluted net loss per share is computed by dividing net loss by the weighted-average number of shares of common stock outstanding during the period. Diluted earnings per share attributable to common stockholders adjusts basic earnings per share for the potentially dilutive impact of stock options, restricted stock units, restricted stock awards, shares issuable under its employee stock purchase place and performance stock awards. The Company also applies the if-converted method for calculation of diluted per share for its convertible debt instruments. As the Company has reported losses for all periods presented, all potentially dilutive securities are antidilutive and accordingly, basic net loss per share equals diluted net loss per share. Prior to the Conversion, the Company’s basic and diluted net loss per share attributable to common stockholders was presented in conformity with the two-class method required for multiple classes of common stock and participating securities. Under the two-class method, net income is attributed to common stockholders and participating securities based on their participation rights. Under the two-class method, basic net loss per share attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted earnings per share attributable to common stockholders adjusts basic earnings per share for the potentially dilutive impact of stock options, restricted stock units, restricted stock awards, shares issuable under our employee stock purchase place and performance stock awards.
Recently Issued and Adopted Accounting Pronouncements	Recently Issued and Adopted Accounting Pronouncements In November 2023, the FASB issued ASU 2023-07 “Segment Reporting - Improvements to Reportable Segment Disclosures”, which updates reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses and information used to assess segment performance. The guidance is effective for the Company's annual periods beginning in 2024 and interim periods beginning in the first quarter of fiscal year 2025. The Company is currently evaluating the impact of the new guidance and intends to adopt the guidance retrospectively when it becomes effective in 2024.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Schedule of Property and Equipment, Useful Lives	The estimated useful life of each asset category is as follows: Computer and networking equipment 3 to 5 years Leasehold improvements Shorter of lease term or 5 years Furniture and fixtures 3 years Office equipment 3 years Internal-use software 3 to 5 years Property and equipment, net consisted of the following: As of December 31, 2023 2022 (in thousands) Computer and networking equipment $ 224,313 $ 225,009 Leasehold improvements 8,605 8,374 Furniture and fixtures 2,142 1,792 Office equipment 1,228 1,176 Internal-use software 97,623 66,488 Property and equipment, gross 333,911 302,839 Accumulated depreciation and amortization (157,303) (122,461) Property and equipment, net $ 176,608 $ 180,378
Schedule of Intangible Assets	The useful lives of the intangible assets are as follows: Customer relationships 3 to 8 years Developed technology 4 to 5 years Trade names 3 to 4 years Backlog 2 years Internet protocol addresses 10 years In-process research and development (“IPR&D”) Indefinite As of December 31, 2023 and December 31, 2022, the Company’s intangible assets consisted of the following: As of December 31, 2023 As of December 31, 2022 Gross carrying value Accumulated amortization Net carrying value Gross carrying value Accumulated amortization Net carrying value (in thousands) Intangible assets: Customer relationships $ 69,860 $ (28,473) $ 41,387 $ 69,860 $ (19,582) $ 50,278 Developed technology 50,130 (32,424) 17,706 50,130 (22,367) 27,763 Trade names 3,910 (3,542) 368 3,910 (2,564) 1,346 Internet protocol addresses 4,984 (1,970) 3,014 4,984 (1,471) 3,513 Backlog — — — 2,200 (2,200) — Total intangible assets $ 128,884 $ (66,409) $ 62,475 $ 131,084 $ (48,184) $ 82,900

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Schedule of Revenue by Geographic Area	The following table presents the Company’s net revenue by geographic region: Year ended December 31, 2023 2022 2021 (in thousands) United States $ 370,424 $ 316,149 $ 260,399 Asia Pacific 72,873 58,073 39,496 Europe 42,770 38,469 35,177 All other 19,921 20,034 19,258 Total revenue $ 505,988 $ 432,725 $ 354,330
Schedule of Revenue by Customer Type	The following table presents the Company’s net revenue for enterprise and non-enterprise customers based on the prior methodology: Year ended December 31, 2023 2022 2021 (in thousands) Enterprise customers $ 458,472 $ 386,853 $ 313,360 Non-enterprise customers 47,516 45,872 40,970 Total revenue $ 505,988 $ 432,725 $ 354,330 Year ended December 31, 2023 2022 2021 (in thousands) Enterprise customers $ 464,452 $ 393,152 $ 315,918 Non-enterprise customers 41,536 39,573 38,412 Total revenue $ 505,988 $ 432,725 $ 354,330
Schedule of Contract Assets and Liabilities	The following table presents the Company’s contract assets and contract liabilities as of December 31, 2023 and 2022: As of December 31, 2023 As of December 31, 2022 (in thousands) Contract assets $ 621 $ 19 Contract liabilities $ 38,150 $ 30,544 The following table presents revenue recognized during the years ended December 31, 2023 and 2022 from amounts included in the contract liability at the beginning of the period: Year ended December 31, 2023 2022 (in thousands) Revenue recognized in the period from amounts included in contract liability at the beginning of the period $ 28,616 $ 26,274
Schedule of Costs to Obtain Contracts	As of December 31, 2023 and December 31, 2022, the Company’s costs to obtain contracts were as follows: As of December 31, 2023 As of December 31, 2022 (in thousands) Deferred contract costs, net $ 61,981 $ 50,523

Investments and Fair Value Me_2

Investments and Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of Cash, Cash Equivalents, and Marketable Securities	The Company’s total cash, cash equivalents and marketable securities consisted of the following: As of December 31, 2023 2022 (in thousands) Cash and cash equivalents: Cash $ 21,269 $ 46,516 U.S. Treasury securities 52,830 — Money market funds 21,166 96,875 Commercial paper 12,656 — Total cash and cash equivalents 107,921 143,391 Marketable securities: U.S. Treasury securities $ 73,448 $ 287,988 Corporate notes and bonds 105,566 $ 71,744 Commercial paper 25,934 — Agency bonds 9,851 — Asset-backed securities — 175 Municipal securities — 2,221 Foreign government and supranational securities — 12,453 Total marketable securities, current $ 214,799 $ 374,581 Corporate notes and bonds 5,999 140,949 Asset-backed securities 89 24,156 Total marketable securities, non-current $ 6,088 $ 165,105 Total marketable securities $ 220,887 $ 539,686 Total cash, cash equivalents and marketable securities $ 328,808 $ 683,077
Schedule of Available-For-Sale Investments	The following table summarizes adjusted cost, gross unrealized gains and losses, and fair value related to cash and cash equivalents and available-for-sale securities on the accompanying consolidated balance sheets as of December 31, 2023 and December 31, 2022: As of December 31, 2023 Amortized Gross Gross Fair (in thousands) Cash and cash equivalents: U.S. Treasury securities $ 52,824 $ 6 $ — $ 52,830 Commercial paper $ 12,663 $ — $ (7) $ 12,656 Marketable securities: U.S. Treasury securities $ 73,444 $ 8 $ (4) $ 73,448 Corporate notes and bonds 112,487 9 (931) 111,565 Commercial paper 25,946 — (12) 25,934 Asset-backed securities 89 — — 89 Agency bonds 9,854 — (3) 9,851 Total available-for-sale investments $ 287,307 $ 23 $ (957) $ 286,373 As of December 31, 2022 Amortized Gross Unrealized Gain Gross Fair (in thousands) Marketable securities: U.S. Treasury securities $ 291,685 $ — $ (3,697) $ 287,988 Corporate notes and bonds 217,187 — (4,494) 212,693 Asset-backed securities 24,617 — (286) 24,331 Municipal securities 2,322 — (101) 2,221 Foreign government and supranational securities 12,522 — (69) 12,453 Total available-for-sale investments $ 548,333 $ — $ (8,647) $ 539,686
Schedule of Financial Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis	Financial assets and liabilities measured and recorded at fair value on a recurring basis consisted of the following types of instruments: As of December 31, 2023 Level 1 Level 2 Level 3 Total (in thousands) Cash equivalents: Money market funds $ 21,166 $ — $ — $ 21,166 U.S. Treasury securities — 52,830 — 52,830 Commercial paper — 12,656 — 12,656 Total cash equivalents 21,166 65,486 — 86,652 Marketable securities: U.S. Treasury securities — 73,448 — 73,448 Corporate notes and bonds — 111,565 — 111,565 Commercial paper — 25,934 — 25,934 Asset-backed securities — 89 — 89 Agency bonds — 9,851 — 9,851 Total marketable securities — 220,887 — 220,887 Restricted cash: Restricted cash, current 150 — — 150 Total restricted cash 150 — — 150 Total financial assets $ 21,316 $ 286,373 $ — $ 307,689 As of December 31, 2022 Level 1 Level 2 Level 3 Total (in thousands) Cash equivalents: Money market funds $ 96,875 $ — $ — $ 96,875 Total cash equivalents 96,875 — — 96,875 Marketable securities: U.S. Treasury securities — 287,988 — 287,988 Corporate notes and bonds — 212,693 — 212,693 Asset-backed securities — 24,331 — 24,331 Municipal securities — 2,221 — 2,221 Foreign government and supranational securities — 12,453 — 12,453 Total marketable securities — 539,686 — 539,686 Restricted cash: Restricted cash, current 150 — — 150 Total restricted cash 150 — — 150 Total financial assets $ 97,025 $ 539,686 $ — $ 636,711

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2023
Business Combination and Asset Acquisition [Abstract]
Schedule of Identifiable Finite-Lived Intangible Assets	Identifiable finite-lived intangible assets were comprised of the following (in thousands): Total Estimated useful life (in years) Developed technology $ 630 4 Customer relationships 760 3 Trade name 610 4 Total intangible assets acquired $ 2,000

Balance Sheet Information (Tabl

Balance Sheet Information (Tables)	12 Months Ended
	Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]
Schedule of Allowance for Doubtful Accounts	The activity in the accounts receivable reserves is as follows: As of December 31, 2023 2022 2021 (in thousands) Beginning balance $ 5,029 $ 3,311 $ 3,248 Additions to the reserves 2,025 2,406 196 Write-offs and adjustments — (688) (133) Ending balance $ 7,054 $ 5,029 $ 3,311
Schedule of Property and Equipment, Net	The estimated useful life of each asset category is as follows: Computer and networking equipment 3 to 5 years Leasehold improvements Shorter of lease term or 5 years Furniture and fixtures 3 years Office equipment 3 years Internal-use software 3 to 5 years Property and equipment, net consisted of the following: As of December 31, 2023 2022 (in thousands) Computer and networking equipment $ 224,313 $ 225,009 Leasehold improvements 8,605 8,374 Furniture and fixtures 2,142 1,792 Office equipment 1,228 1,176 Internal-use software 97,623 66,488 Property and equipment, gross 333,911 302,839 Accumulated depreciation and amortization (157,303) (122,461) Property and equipment, net $ 176,608 $ 180,378
Schedule of Other Assets	Other assets consisted of the following: As of December 31, 2023 2022 (in thousands) Deferred contract costs, net $ 61,981 $ 50,523 Advance payment for purchase of property and equipment 24,509 37,013 Other assets 4,289 5,086 Total other assets $ 90,779 $ 92,622
Schedule of Accrued Expenses	Accrued expenses consisted of the following: As of December 31, 2023 2022 (in thousands) Accrued compensation and related benefits $ 14,918 $ 20,204 Accrued bonus 24,614 15,818 Accrued colocation and bandwidth costs 14,362 10,448 Other tax liabilities 4,344 8,698 Other accrued expenses 3,580 5,993 Total accrued expenses $ 61,818 $ 61,161
Schedule of Other Current Liabilities	Other current liabilities consisted of the following: As of December 31, 2023 2022 (in thousands) Deferred revenue $ 33,824 $ 28,047 Accrued computer and networking equipment 1,673 1,467 Holdback payable 3,771 4,013 Other current liabilities 1,271 867 Total other current liabilities $ 40,539 $ 34,394
Schedule of Accumulated Other Comprehensive Loss	The following table summarizes the changes in accumulated other comprehensive loss, which is reported as a component of stockholders’ equity: Foreign Currency Translation Unrealized gain/(loss) for available-for-sale investments Accumulated Other Comprehensive Income (Loss) (in thousands) Balance at December 31, 2020 $ (36) $ 42 $ 6 Other comprehensive loss (286) (2,347) (2,633) Balance at December 31, 2021 (322) (2,305) (2,627) Other comprehensive loss (255) (6,404) (6,659) Balance at December 31, 2022 $ (577) $ (8,709) $ (9,286) Other comprehensive income 565 7,713 8,278 Balance at December 31, 2023 $ (12) $ (996) $ (1,008)

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Schedule of Lease Costs & Other Information	The components of lease cost were as follows: As of December 31, 2023 2022 2021 (in thousands) Operating lease cost: Operating lease cost $ 26,996 $ 30,976 $ 26,716 Variable lease cost 15,112 11,736 6,820 Total operating lease cost $ 42,108 $ 42,712 $ 33,536 Finance lease cost: Amortization of assets under finance lease $ 14,391 $ 14,539 $ 6,834 Interest 1,328 2,381 1,754 Total finance lease cost $ 15,719 $ 16,920 $ 8,588 As of December 31, 2023 2022 2021 (in thousands) Weighted Average Remaining Lease term (in years): Operating leases 3.48 4.09 4.41 Finance leases 1.00 1.74 2.23 Weighted Average Discount Rate: Operating leases 6.03 % 5.36 % 5.20 % Finance leases 4.67 % 4.73 % 4.86 %
Schedule of Operating Lease Maturities	Future minimum lease payments under non-cancellable leases as of December 31, 2023 were as follows: Operating Leases Finance Leases (in thousands) Year ending December 31, 2024 $ 28,160 $ 16,064 2025 20,868 1,617 2026 18,896 — 2027 10,502 — 2028 2,446 — Thereafter 1,838 — Total future minimum lease payments $ 82,710 $ 17,681 Less: imputed interest (7,905) (395) Total liability $ 74,805 $ 17,286
Schedule of Finance Lease Maturity	Future minimum lease payments under non-cancellable leases as of December 31, 2023 were as follows: Operating Leases Finance Leases (in thousands) Year ending December 31, 2024 $ 28,160 $ 16,064 2025 20,868 1,617 2026 18,896 — 2027 10,502 — 2028 2,446 — Thereafter 1,838 — Total future minimum lease payments $ 82,710 $ 17,681 Less: imputed interest (7,905) (395) Total liability $ 74,805 $ 17,286

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in the Carrying Amount of Goodwill	The changes in the carrying amount of goodwill for th e years ended December 31, 2023 and 2022 are as follows : Year ended December 31, 2023 2022 (in thousands) Beginning balance $ 670,185 $ 636,805 Goodwill acquired from business combinations — 33,419 Foreign currency translation and other adjustments 171 (39) Ending balance $ 670,356 $ 670,185
Schedule of Intangible Assets	The useful lives of the intangible assets are as follows: Customer relationships 3 to 8 years Developed technology 4 to 5 years Trade names 3 to 4 years Backlog 2 years Internet protocol addresses 10 years In-process research and development (“IPR&D”) Indefinite As of December 31, 2023 and December 31, 2022, the Company’s intangible assets consisted of the following: As of December 31, 2023 As of December 31, 2022 Gross carrying value Accumulated amortization Net carrying value Gross carrying value Accumulated amortization Net carrying value (in thousands) Intangible assets: Customer relationships $ 69,860 $ (28,473) $ 41,387 $ 69,860 $ (19,582) $ 50,278 Developed technology 50,130 (32,424) 17,706 50,130 (22,367) 27,763 Trade names 3,910 (3,542) 368 3,910 (2,564) 1,346 Internet protocol addresses 4,984 (1,970) 3,014 4,984 (1,471) 3,513 Backlog — — — 2,200 (2,200) — Total intangible assets $ 128,884 $ (66,409) $ 62,475 $ 131,084 $ (48,184) $ 82,900
Schedule of Expected Amortization Expense of Intangible Assets	The expected amortization expense of intangible assets subject to amortization as of December 31, 2023 is as follows: As of December 31, 2023 (in thousands) 2024 $ 19,599 2025 16,976 2026 9,193 2027 9,051 2028 6,891 Thereafter 765 Total $ 62,475

Debt Instruments (Tables)

Debt Instruments (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Schedule of Carrying Values of Debt Agreements	The following table reflects the carrying values of the debt agreements as of December 31, 2023 and 2022 as follows : Year ended December 31, 2023 2022 (in thousands) Convertible Senior notes (effective interest rate of 0.38% and 0.40% as of December 31, 2023 and 2022, respectively) Principal amount $ 346,489 $ 713,753 Less: unamortized debt issuance costs (2,982) (9,043) Less: current portion of long-term debt — — Long-term debt, less current portion $ 343,507 $ 704,710

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Schedule of Purchase Commitments	Aside from the Company’s finance and operating lease commitments, including its colocation operating commitments, which have been disclosed in Note 7—Leases, the minimum future commitments related to the Company’s purchase commitments as of December 31, 2023 were as follows: Cost of Revenue Commitments Operating Expense Commitments Total Purchase Commitments (in thousands) 2024 $ 48,699 $ 10,480 $ 59,179 2025 6,105 3,797 9,902 2026 8,111 2,097 10,208 2027 111 — 111 2028 40 — 40 Thereafter — — — Total $ 63,066 $ 16,374 $ 79,440

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2023
Stockholders' Equity Note [Abstract]
Schedule of Stock Option Activity	The following table summarizes stock option activity during the year ended December 31, 2023: Number of Shares Weighted-Average Weighted-Average Aggregate (in thousands) (in years) (in thousands) Outstanding at December 31, 2022 2,443 $ 6.01 4.7 $ 7,674 Granted 602 16.47 Exercised (291) 7.45 Forfeited (44) 8.41 Outstanding at December 31, 2023 2,710 $ 8.14 5.1 $ 26,383 Vested and exercisable at December 31, 2023 2,142 $ 5.94 3.8 $ 25,620
Schedule of Employee Stock Purchase Plan Valuation Assumptions	The Company estimated the fair value of stock option awards during the year ended December 31, 2023 on the date of the grant using the Black-Scholes option pricing model with the following weighted-average assumptions: Year ended December 31, 2023 Fair value of common stock $16.47 Expected term (in years) 5.96 Risk-free interest rate 4.67% Expected volatility 71.2% Dividend yield —% The Company estimated the fair value of shares granted under the ESPP on the first date of the offering period using the Black-Scholes option pricing model with the following assumptions: Year ended December 31, 2023 2022 2021 Fair value of common stock $3.33 – $6.09 $8.40 – $11.85 $41.24 – $44.87 Expected term (in years) 0.49 – 0.50 0.49 0.49 – 0.50 Risk-free interest rate 4.65% – 5.43% 1.57% – 4.65% 0.02% – 0.07% Expected volatility 70% – 88% 88% – 101% 47% – 58% Dividend yield — % — % — %
Schedule of Restricted Stock Units and Restricted Stock Awards	The following table summarizes RSU activity during the years ended December 31, 2023: Number of Shares Weighted-Average Grant Date Fair Value Per Share (in thousands) Nonvested RSUs as of December 31, 2022 11,990 $ 20.10 Granted 7,667 15.80 Vested (6,719) 18.94 Cancelled/forfeited (1,694) 22.80 Nonvested RSUs as of December 31, 2023 11,244 $ 17.46 Number of Shares Weighted-Average Grant Date Fair Value Per Share (in thousands) Nonvested executive PSUs as of December 31, 2022 267 $ 28.16 Granted 762 15.88 Vested (84) 28.16 Cancelled/forfeited (213) 24.35 Nonvested executive PSUs as of December 31, 2023 732 $ 16.49 Number of Shares Weighted-Average Grant Date Fair Value Per Share (in thousands) Nonvested MPSUs as of December 31, 2022 2,174 $ 6.80 Granted 87 7.25 Vested (540) 7.84 Cancelled/forfeited (250) 6.69 Nonvested MPSUs as of December 31, 2023 1,471 $ 6.46
Schedule of Stock-Based Compensation Expense	The following table summarizes the components of total stock-based compensation expense included in the accompanying consolidated statements of operations: Year ended December 31, 2023 2022 2021 (in thousands) Cost of revenue $ 11,656 $ 12,050 $ 7,227 Research and development 47,827 58,435 47,019 Sales and marketing 33,703 39,083 31,159 General and administrative 43,117 36,228 55,083 Total $ 136,303 $ 145,796 $ 140,488

Net Loss Per Share Attributab_2

Net Loss Per Share Attributable to Common Stockholders (Tables)	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Schedule of Net Loss Per Share, Basic and Diluted	The following table presents the computation of basic and diluted net loss per share of common stock (in millions, except per share data): Year ended December 31, 2023 2022 2021 Class A (1) Class B (2) Class A (1) Class B (2) Class A (1) Class B (2) (in thousands, except per share amounts) Net loss attributable to common stockholders $ (133,088) $ — $ (190,774) $ — $ (212,120) $ (10,577) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 128,770 — 121,723 — 110,541 5,512 Net loss per share attributable to common stockholders, basic and diluted $ (1.03) $ — $ (1.57) $ — (1.92) $ (1.92) __________ (1) Class A common stock includes the issuance of 12.9 million shares of Class A common stock issued by the Company in connection with the IPO and the shares issued in connection with the follow-on offering on May 26, 2020. It also includes shares issued upon the exercise of options and vesting of RSUs granted subsequent to the IPO, shares issued as part of the prior acquisitions, and converted Common B shares. (2)
Schedule of Antidilutive Securities Excluded from Computation of Net Loss Per Share	The following securities were excluded from the computation of diluted net loss per share of common stock for the periods presented as their effect would have been antidilutive: Number of Shares Year ended December 31, 2023 2022 2021 (in thousands) Stock options 2,710 2,443 4,369 RSUs 11,244 11,990 5,285 Revest shares — — 336 PSUs 732 267 71 MPSUs 1,471 2,174 — Bonus PSUs 1,572 1,777 — Shares issuable pursuant to the ESPP 410 186 51 Convertible senior notes (if-converted) 3,370 7,338 9,229 Total 21,509 26,175 19,341

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Loss Before Income Taxes	Loss before income ta xes includes the following components: Year ended December 31, 2023 2022 2021 (in thousands) United States $ (137,240) $ (196,469) $ (224,159) Foreign 3,931 5,789 1,531 Loss before income taxes $ (133,309) $ (190,680) $ (222,628)
Schedule of Income Tax Expense (Benefit)	The income tax expense (benefit) consists of the following: Year ended December 31, 2023 2022 2021 (in thousands) Current tax provision (benefit): Federal $ — $ — $ — State 57 (79) — Foreign 622 173 322 Deferred tax benefit: Federal — — (253) State — — — Foreign (900) — — Total tax expense (benefit) $ (221) $ 94 $ 69
Schedule of Effective Tax Rate Reconciliation	Reconciliation between the Company’s effective tax rate on income from continuing operations and the U.S. federal statutory rate is as follows: Year ended December 31, 2023 2022 2021 Provision at federal statutory tax rate 21 % 21 % 21 % Change in valuation allowance (25) (14) (30) Foreign tax rate differential 1 — — Stock-based compensation (4) (9) 2 Research and development credits 10 2 5 Disallowed executive compensation (3) — — Restructuring — — 2 Effective tax rate — % — % — %
Schedule of Deferred Tax Assets and Liabilities	The Company’s deferred tax assets and liabilities were as follows: Year ended December 31, 2023 2022 (in thousands) Deferred tax assets: Net operating losses $ 178,149 $ 183,306 Lease liability 20,137 23,245 Research and development credits 38,280 21,383 Capitalized research and development 45,418 21,032 Stock-based compensation 11,765 10,429 Deferred revenue 4,934 2,811 Reserves and accruals 4,336 4,648 Other 1,889 4,179 Deferred tax assets 304,908 271,033 Intangible asset amortization (16,310) (21,713) Right-of-use asset (15,322) (18,847) State taxes (13,032) (10,732) Prepaid commissions (13,868) (11,526) Deferred tax liabilities (58,532) (62,818) Valuation allowance (245,476) (208,215) Net deferred tax (liabilities) assets $ 900 $ —
Schedule of Unrecognized Tax Benefits	A reconciliation of the Company’s unrecognized tax benefits is as follows (in thousands): Year ended December 31, 2023 2022 Balance at beginning of year $ 17,337 $ 7,808 Increases related to prior year tax positions 2,674 8,697 Decreases related to prior year tax positions — (751) Increases related to current year tax positions 3,234 1,583 Balance at end of year $ 23,245 $ 17,337

Information About Revenue and_2

Information About Revenue and Geographic Areas (Tables)	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Schedule of Long-Lived Assets by Geographic Region	The Company’s property and equipment and operating lease right-of-use assets, each net, by geographic area were as follows: As of December 31, 2023 2022 (in thousands) United States $ 166,413 $ 175,794 All other countries 65,407 73,024 Total long-lived assets $ 231,820 $ 248,818

Nature of Business (Details)

Nature of Business (Details)	Dec. 31, 2023 operating_market
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating markets	79

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details) - Customer One - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	23%	15%
Revenue
Concentration Risk [Line Items]
Concentration risk, percentage	12%	11%	11%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Restricted cash	$ 0.2	$ 0.2

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Incremental Costs to Obtain a Contract With Customer (Details)	Dec. 31, 2023
Customer Arrangement
Capitalized Contract Cost [Line Items]
Capitalized contract cost, useful life (in years)	5 years

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Schedule of Property and Equipment (Details)	Dec. 31, 2023
Computer and networking equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)	3 years
Computer and networking equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)	5 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)	5 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)	3 years
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)	3 years
Internal-use software | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)	3 years
Internal-use software | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)	5 years

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Internal-Use Software Development Costs (Details) - Internal-use software	Dec. 31, 2023
Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)	3 years
Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)	5 years

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Goodwill Narrative (Details)	12 Months Ended
	Dec. 31, 2023 segment
Accounting Policies [Abstract]
Number of operating segments	1
Number of reportable segments	1

Summary of Significant Accou_10

Summary of Significant Accounting Policies - Schedule of Intangible Assets (Details)	Dec. 31, 2023
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	3 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	8 years
Developed technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	4 years
Developed technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	5 years
Trade names | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	3 years
Trade names | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	4 years
Backlog
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	2 years
Internet protocol addresses
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	10 years

Summary of Significant Accou_11

Summary of Significant Accounting Policies - Cost of Revenue (Details)	12 Months Ended
	Dec. 31, 2023
Bandwidth Contracts
Disaggregation of Revenue [Line Items]
Typical duration of contracts (in years)	1 year
Colocation Services | Minimum
Disaggregation of Revenue [Line Items]
Typical duration of contracts (in years)	1 year
Colocation Services | Maximum
Disaggregation of Revenue [Line Items]
Typical duration of contracts (in years)	6 years

Summary of Significant Accou_12

Summary of Significant Accounting Policies - Advertising Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Advertising expense	$ 4.6	$ 2.5	$ 2.3

Summary of Significant Accou_13

Summary of Significant Accounting Policies - Accounting for Stock-Based Compensation (Details)	12 Months Ended
	Dec. 31, 2023
Minimum
Disaggregation of Revenue [Line Items]
Requisite service period (in years)	3 years
Maximum
Disaggregation of Revenue [Line Items]
Requisite service period (in years)	4 years

Revenue - Revenue by Geographic

Revenue - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 505,988	$ 432,725	$ 354,330
United States
Disaggregation of Revenue [Line Items]
Total revenue	370,424	316,149	260,399
Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenue	72,873	58,073	39,496
Europe
Disaggregation of Revenue [Line Items]
Total revenue	42,770	38,469	35,177
All other
Disaggregation of Revenue [Line Items]
Total revenue	$ 19,921	$ 20,034	$ 19,258

Revenue - Narrative (Details)

Revenue - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Enterprise customer threshold	$ 100,000
Revenue, performance obligation, description of payment terms	The Company’s payment terms and conditions vary by contract type, and generally range from 30 to 90 days.
Amortization of deferred contract costs	$ 15,548,000	$ 8,916,000	$ 6,294,000

Revenue - Revenue by Customer T

Revenue - Revenue by Customer Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 505,988	$ 432,725	$ 354,330
Prior Revenue Methodology
Disaggregation of Revenue [Line Items]
Total revenue	505,988	432,725	354,330
New Revenue Methodology
Disaggregation of Revenue [Line Items]
Total revenue	505,988	432,725	354,330
Enterprise customers | Prior Revenue Methodology
Disaggregation of Revenue [Line Items]
Total revenue	458,472	386,853	313,360
Enterprise customers | New Revenue Methodology
Disaggregation of Revenue [Line Items]
Total revenue	464,452	393,152	315,918
Non-enterprise customers | Prior Revenue Methodology
Disaggregation of Revenue [Line Items]
Total revenue	47,516	45,872	40,970
Non-enterprise customers | New Revenue Methodology
Disaggregation of Revenue [Line Items]
Total revenue	$ 41,536	$ 39,573	$ 38,412

Revenue - Contract Assets and L

Revenue - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Contract assets	$ 621	$ 19
Contract liabilities	38,150	30,544
Contract with Customer, Liability
Revenue recognized in the period from amounts included in contract liability at the beginning of the period	$ 28,616	$ 26,274

Revenue - Remaining Performance

Revenue - Remaining Performance Obligation (Details) $ in Millions	Dec. 31, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 235.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	80%
Remaining performance obligation, expected time period of recognition	12 months

Revenue - Costs to Obtain Contr

Revenue - Costs to Obtain Contracts (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Deferred contract costs, net	$ 61,981	$ 50,523

Investments and Fair Value Me_3

Investments and Fair Value Measurements - Cash, Cash Equivalent and Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Total cash and cash equivalents	$ 107,921	$ 143,391	$ 166,068
Total marketable securities, current	214,799	374,581
Total marketable securities, non-current	6,088	165,105
Total marketable securities	220,887	539,686
Total cash, cash equivalents and marketable securities	328,808	683,077
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Total marketable securities, current	73,448	287,988
Total marketable securities	73,448	287,988
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Total marketable securities, current	105,566	71,744
Total marketable securities, non-current	5,999	140,949
Total marketable securities	111,565	212,693
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total marketable securities, current	25,934	0
Total marketable securities	25,934
Agency bonds
Debt Securities, Available-for-sale [Line Items]
Total marketable securities, current	9,851	0
Total marketable securities	9,851
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total marketable securities, current	0	175
Total marketable securities, non-current	89	24,156
Total marketable securities	89	24,331
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Total marketable securities, current	0	2,221
Total marketable securities		2,221
Foreign government and supranational securities
Debt Securities, Available-for-sale [Line Items]
Total marketable securities, current	0	12,453
Total marketable securities		12,453
Cash
Debt Securities, Available-for-sale [Line Items]
Total cash and cash equivalents	21,269	46,516
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Total cash and cash equivalents	52,830	0
Money market funds
Debt Securities, Available-for-sale [Line Items]
Total cash and cash equivalents	21,166	96,875
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total cash and cash equivalents	$ 12,656	$ 0

Investments and Fair Value Me_4

Investments and Fair Value Measurements - Available-For-Sale Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 287,307	$ 548,333
Gross Unrealized Gain	23	0
Gross Unrealized Loss	(957)	(8,647)
Fair Value	286,373	539,686
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	73,444	291,685
Gross Unrealized Gain	8	0
Gross Unrealized Loss	(4)	(3,697)
Fair Value	73,448	287,988
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	112,487	217,187
Gross Unrealized Gain	9	0
Gross Unrealized Loss	(931)	(4,494)
Fair Value	111,565	212,693
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	25,946
Gross Unrealized Gain	0
Gross Unrealized Loss	(12)
Fair Value	25,934
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	89	24,617
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	(286)
Fair Value	89	24,331
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		2,322
Gross Unrealized Gain		0
Gross Unrealized Loss		(101)
Fair Value		2,221
Foreign government and supranational securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		12,522
Gross Unrealized Gain		0
Gross Unrealized Loss		(69)
Fair Value		$ 12,453
Agency bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,854
Gross Unrealized Gain	0
Gross Unrealized Loss	(3)
Fair Value	9,851
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	52,824
Gross Unrealized Gain	6
Gross Unrealized Loss	0
Fair Value	52,830
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,663
Gross Unrealized Gain	0
Gross Unrealized Loss	(7)
Fair Value	$ 12,656

Investments and Fair Value Me_5

Investments and Fair Value Measurements - Narrative (Details) $ in Millions	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Fair Value Disclosures [Abstract]
Securities in a continuous loss position (in securities) | security	28	76
Restricted cash | $	$ 0.2	$ 0.2

Investments and Fair Value Me_6

Investments and Fair Value Measurements - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	$ 86,652	$ 96,875
Marketable securities	220,887	539,686
Restricted cash, current	150	150
Total financial assets	307,689	636,711
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	73,448	287,988
Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	111,565	212,693
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	25,934
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	89	24,331
Agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	9,851
Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		2,221
Foreign government and supranational securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		12,453
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	21,166	96,875
Restricted cash, current	150	150
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	52,830
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	12,656
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	21,166	96,875
Marketable securities	0	0
Restricted cash, current	150	150
Total financial assets	21,316	97,025
Level 1 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 1 | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 1 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Level 1 | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 1 | Agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Level 1 | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		0
Level 1 | Foreign government and supranational securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		0
Level 1 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	21,166	96,875
Restricted cash, current	150	150
Level 1 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	0
Level 1 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	65,486	0
Marketable securities	220,887	539,686
Restricted cash, current	0	0
Total financial assets	286,373	539,686
Level 2 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	73,448	287,988
Level 2 | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	111,565	212,693
Level 2 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	25,934
Level 2 | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	89	24,331
Level 2 | Agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	9,851
Level 2 | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		2,221
Level 2 | Foreign government and supranational securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		12,453
Level 2 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	0	0
Restricted cash, current	0	0
Level 2 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	52,830
Level 2 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	12,656
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	0	0
Marketable securities	0	0
Restricted cash, current	0	0
Total financial assets	0	0
Level 3 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 3 | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 3 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Level 3 | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 3 | Agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Level 3 | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		0
Level 3 | Foreign government and supranational securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		0
Level 3 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	0	0
Restricted cash, current	0	$ 0
Level 3 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	0
Level 3 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	$ 0

Business Combinations - Narrati

Business Combinations - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	May 18, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Goodwill		$ 670,356	$ 670,185	$ 636,805
Glitch Inc
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired (as a percent)	100%
Aggregate consideration transferred	$ 34,900
Consideration transferred, holdback	$ 8,000
Holdback distributions		$ 4,100
Consideration transferred, holdback, period for distribution	24 months
Intangible assets	$ 2,000
Cash	1,600
Other assets, net	600
Goodwill	$ 32,500
Acquisition related costs			$ 2,000
Estimated useful life (in years)		3 years 7 months 6 days

Business Combinations - Schedul

Business Combinations - Schedule of Identifiable Finite-Lived Intangible Assets (Details) - Glitch Inc - USD ($) $ in Thousands		12 Months Ended
	May 18, 2022	Dec. 31, 2023
Business Acquisition [Line Items]
Total	$ 2,000
Estimated useful life (in years)		3 years 7 months 6 days
Developed technology
Business Acquisition [Line Items]
Total	$ 630
Estimated useful life (in years)	4 years
Customer relationships
Business Acquisition [Line Items]
Total	$ 760
Estimated useful life (in years)	3 years
Trade names
Business Acquisition [Line Items]
Total	$ 610
Estimated useful life (in years)	4 years

Balance Sheet Information - All

Balance Sheet Information - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 5,029	$ 3,311	$ 3,248
Additions to the reserves	2,025	2,406	196
Write-offs and adjustments	0	(688)	(133)
Ending balance	$ 7,054	$ 5,029	$ 3,311

Balance Sheet Information - Pro

Balance Sheet Information - Property and equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 333,911	$ 302,839
Accumulated depreciation and amortization	(157,303)	(122,461)
Property and equipment, net	176,608	180,378
Computer and networking equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	224,313	225,009
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,605	8,374
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,142	1,792
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,228	1,176
Internal-use software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	97,623	66,488
Property and equipment, net	$ 62,600	$ 45,500

Balance Sheet Information - Nar

Balance Sheet Information - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Impairment expense	$ 4,316,000	$ 0	$ 0
Depreciation and amortization	51,600,000	42,600,000	28,800,000
Property and equipment, net	176,608,000	180,378,000
Property, Plant and Equipment
Property, Plant and Equipment [Line Items]
Impairment expense	3,000,000
Property, Plant And Equipment, Advance Payments
Property, Plant and Equipment [Line Items]
Impairment expense	1,300,000
Internal-use software
Property, Plant and Equipment [Line Items]
Depreciation and amortization	14,000,000	8,600,000	$ 4,600,000
Property and equipment, net	62,600,000	45,500,000
Computer and networking equipment
Property, Plant and Equipment [Line Items]
Finance lease, right-of-use asset, before accumulated amortization	74,700,000	77,300,000
Finance lease, right-of-use asset, accumulated amortization	$ 40,100,000	$ 28,100,000

Balance Sheet Information - Oth

Balance Sheet Information - Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract]
Deferred contract costs, net	$ 61,981	$ 50,523
Advance payment for purchase of property and equipment	24,509	37,013
Other assets	4,289	5,086
Total other assets	$ 90,779	$ 92,622

Balance Sheet Information - Acc

Balance Sheet Information - Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract]
Accrued compensation and related benefits	$ 14,918	$ 20,204
Accrued bonus	24,614	15,818
Accrued colocation and bandwidth costs	14,362	10,448
Other tax liabilities	4,344	8,698
Other accrued expenses	3,580	5,993
Total accrued expenses	$ 61,818	$ 61,161

Balance Sheet Information - O_2

Balance Sheet Information - Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract]
Deferred revenue	$ 33,824	$ 28,047
Accrued computer and networking equipment	1,673	1,467
Holdback payable	3,771	4,013
Other current liabilities	1,271	867
Total other current liabilities	$ 40,539	$ 34,394

Balance Sheet Information - A_2

Balance Sheet Information - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 955,158	$ 1,013,953	$ 1,061,865
Other comprehensive income (loss)	8,278	(6,659)	(2,633)
Ending balance	979,488	955,158	1,013,953
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(577)	(322)	(36)
Other comprehensive income (loss)	565	(255)	(286)
Ending balance	(12)	(577)	(322)
Unrealized gain/(loss) for available-for-sale investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(8,709)	(2,305)	42
Other comprehensive income (loss)	7,713	(6,404)	(2,347)
Ending balance	(996)	(8,709)	(2,305)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(9,286)	(2,627)	6
Other comprehensive income (loss)	8,278	(6,659)	(2,633)
Ending balance	$ (1,008)	$ (9,286)	$ (2,627)

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Sublease income	$ 1,200,000	$ 900,000	$ 1,000,000
Impairment of operating lease right-of-use assets	744,000	$ 2,083,000	$ 0
Lease not yet commenced, commitment amount	$ 2,300,000
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms, operating (in years)	1 year
Subleases, remaining lease terms (in years)	1 year
Lease not yet commenced, term of contract	3 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms, operating (in years)	7 years
Remaining lease terms, finance (in years)	1 year
Subleases, remaining lease terms (in years)	7 years

Leases - Schedule of Lease Cost

Leases - Schedule of Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease cost	$ 26,996	$ 30,976	$ 26,716
Variable lease cost	15,112	11,736	6,820
Total operating lease cost	42,108	42,712	33,536
Amortization of assets under finance lease	14,391	14,539	6,834
Interest	1,328	2,381	1,754
Total finance lease cost	$ 15,719	$ 16,920	$ 8,588

Leases - Schedule of Other Info

Leases - Schedule of Other Information (Details)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Weighted Average Remaining Lease term (in years):
Operating leases	3 years 5 months 23 days	4 years 1 month 2 days	4 years 4 months 28 days
Finance leases	1 year	1 year 8 months 26 days	2 years 2 months 23 days
Weighted Average Discount Rate:
Operating leases	6.03%	5.36%	5.20%
Finance leases	4.67%	4.73%	4.86%

Leases - Schedule of Lease Liab

Leases - Schedule of Lease Liability Maturity (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Operating Leases
2024	$ 28,160
2025	20,868
2026	18,896
2027	10,502
2028	2,446
Thereafter	1,838
Total future minimum lease payments	82,710
Less: imputed interest	(7,905)
Total liability	74,805
Finance Leases
2024	16,064
2025	1,617
2026	0
2027	0
2028	0
Thereafter	0
Total future minimum lease payments	17,681
Less: imputed interest	(395)
Total liability	$ 17,286

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Schedule of Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning balance	$ 670,185	$ 636,805
Goodwill acquired from business combinations	0	33,419
Foreign currency translation and other adjustments	171	(39)
Ending balance	$ 670,356	$ 670,185

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Goodwill, impairment loss	$ 0	$ 0	$ 0
Amortization of intangible assets	20,424,000	21,696,000	21,238,000
Purchase of intangible assets	$ 0	0	$ 2,092,000
Glitch Inc
Finite-Lived Intangible Assets [Line Items]
Purchase of intangible assets		$ 2,000,000

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 128,884	$ 131,084
Accumulated amortization	(66,409)	(48,184)
Net carrying value	62,475	82,900
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	69,860	69,860
Accumulated amortization	(28,473)	(19,582)
Net carrying value	41,387	50,278
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	50,130	50,130
Accumulated amortization	(32,424)	(22,367)
Net carrying value	17,706	27,763
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	3,910	3,910
Accumulated amortization	(3,542)	(2,564)
Net carrying value	368	1,346
Internet protocol addresses
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	4,984	4,984
Accumulated amortization	(1,970)	(1,471)
Net carrying value	3,014	3,513
Backlog
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	0	2,200
Accumulated amortization	0	(2,200)
Net carrying value	$ 0	$ 0

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Schedule of Expected Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
2024	$ 19,599
2025	16,976
2026	9,193
2027	9,051
2028	6,891
Thereafter	765
Net carrying value	$ 62,475	$ 82,900

Debt Instruments - Senior Secur

Debt Instruments - Senior Secured Credit Facilities Agreement (Details) - SVB Revolver			12 Months Ended
	Jun. 28, 2023	Feb. 16, 2021 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Debt facility, maximum borrowing amount		$ 100,000,000
Transaction costs		$ 600,000
Basis spread adjustment	0.10%
Debt covenant, adjusted quick ratio, minimum requirement		1.25
Debt covenant, adjusted quick ratio, minimum threshold to trigger revenue growth covenant requirement		1.75
Amounts drawn on line of credit during the period			$ 0	$ 0
Amount of debt outstanding			$ 0	$ 0
Minimum
Debt Instrument [Line Items]
Line of credit, unused capacity, commitment fee percentage		0.20%
Minimum | London Interbank Offered Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Minimum | Secured Overnight Finance Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Minimum | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.75%
Maximum
Debt Instrument [Line Items]
Line of credit, unused capacity, commitment fee percentage		0.25%
Maximum | London Interbank Offered Rate
Debt Instrument [Line Items]
Basis spread on variable rate		2%
Maximum | Secured Overnight Finance Rate
Debt Instrument [Line Items]
Basis spread on variable rate	2%
Maximum | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1%

Debt Instruments - Convertible

Debt Instruments - Convertible Senior Notes (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Mar. 05, 2021 USD ($)	Dec. 31, 2023 USD ($) day $ / shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	May 25, 2022 USD ($)
Debt Instrument [Line Items]
Issuance of convertible note, net of issuance costs		$ 0	$ 0	$ 930,775
Net gain on extinguishment of debt		$ 52,416	54,391	$ 0
2026 Convertible Notes
Debt Instrument [Line Items]
Issuance of convertible note, net of issuance costs	$ 930,000
2026 Convertible Notes | Common Class A
Debt Instrument [Line Items]
Debt instrument, convertible, conversion ratio		0.0097272
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares		$ 102.80
2026 Convertible Notes | Fastly Conversion Option
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger (as a percent)		130%
Debt instrument, convertible, threshold trading days | day		20
Debt instrument, convertible, threshold consecutive trading days | day		30
2026 Convertible Notes | Holder Conversion Option One | Common Class A
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger (as a percent)		130%
Debt instrument, convertible, threshold trading days | day		20
Debt instrument, convertible, threshold consecutive trading days | day		30
2026 Convertible Notes | Holder Conversion Option Two | Common Class A
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger (as a percent)		98%
Debt instrument, convertible, threshold trading days | day		5
Debt instrument, convertible, threshold consecutive trading days | day		10
Convertible Debt | 2026 Convertible Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 948,800
Interest rate, stated percentage	0%
Debt instrument, face amount, additional principal issuable	$ 123,800
Discount and transaction costs	$ 18,600
Repurchased face amount		$ 367,300			$ 235,000
Repurchase amount		309,100			176,400
Debt repurchase transaction costs		$ 2,000			$ 700
Net gain on extinguishment of debt			$ 54,400
Convertible Debt | 2026 Convertible Notes | Fastly Conversion Option
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage		100%
Convertible Debt | 2026 Convertible Notes | Fundamental Change
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage		100%

Debt Instruments - Schedule of

Debt Instruments - Schedule of Outstanding Debt (Details) - Convertible Debt - 2026 Convertible Notes - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Effective interest rate	0.38%	0.40%
Principal amount	$ 346,489	$ 713,753
Less: unamortized debt issuance costs	(2,982)	(9,043)
Less: current portion of long-term debt	0	0
Long-term debt, less current portion	$ 343,507	$ 704,710

Debt Instruments - Narrative (D

Debt Instruments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Disclosure [Abstract]
Interest expense	$ 2.7	$ 3.4	$ 3.5
Total estimated fair value of the notes	$ 301.4	$ 517.5

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Purchase Commitments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Long-term Purchase Commitment [Line Items]
2024	$ 59,179
2025	9,902
2026	10,208
2027	111
2028	40
Thereafter	0
Total	79,440
Cost of Revenue Commitments
Long-term Purchase Commitment [Line Items]
2024	48,699
2025	6,105
2026	8,111
2027	111
2028	40
Thereafter	0
Total	63,066
Operating Expense Commitments
Long-term Purchase Commitment [Line Items]
2024	10,480
2025	3,797
2026	2,097
2027	0
2028	0
Thereafter	0
Total	$ 16,374

Commitments and Contingencies_2

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Sales and use tax	$ 4.3	$ 7.6

Stockholders' Equity - Common S

Stockholders' Equity - Common Stock and Preferred Stock (Details)	Jul. 12, 2021 shares	Dec. 31, 2023 $ / shares shares	Dec. 31, 2022 $ / shares shares	May 31, 2019 vote $ / shares shares
Class of Stock [Line Items]
Common stock, shares authorized (in shares)		1,000,000,000	1,000,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.00002	$ 0.00002
Common Class A
Class of Stock [Line Items]
Common stock, shares authorized (in shares)				1,000,000,000
Common stock, par value (in dollars per share) | $ / shares				$ 0.00002
Common stock, voting rights (votes per share) | vote				1
Common Class B
Class of Stock [Line Items]
Common stock, shares authorized (in shares)				94,100,000
Common stock, par value (in dollars per share) | $ / shares				$ 0.00002
Common stock, voting rights (votes per share) | vote				10
Common stock retired (in shares)	94,100,000

Stockholders' Equity - Equity I

Stockholders' Equity - Equity Incentive Plans (Details)	12 Months Ended
	Dec. 31, 2023 plan shares	Dec. 31, 2022 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive plans | plan	4
Common stock, shares issued (in shares)	132,992,126	124,336,171
Common stock, shares outstanding (in shares)	132,992,126	124,336,171
Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued (in shares)	133,000,000	124,300,000
Common stock, shares outstanding (in shares)	133,000,000	124,300,000
Common Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued (in shares)		0
Common stock, shares outstanding (in shares)	0
Signal Sciences 2014 Equity Stock Options Plan | Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock options assumed (in shares)	251,754
2019 Equity Incentive Plan | Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares available for future issuance (in shares)	8,900,000	9,600,000

Stockholders' Equity - Stock Op

Stockholders' Equity - Stock Options Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax intrinsic value	$ 3,100	$ 8,900	$ 64,900
Vesting of early exercised stock options	$ 2,100	5,600	6,900
Weighted-average grant date fair value (in dollars per share)	$ 10.97
Stock-based compensation expense	$ 136,303	145,796	140,488
Unrecognized stock-based compensation cost	6,200
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2,100	6,100	24,900
Weighted-average period of recognition	3 years 7 months 6 days
Stock options | 2011 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period	10 years
Award vesting period	4 years
Stock options | 2011 Equity Incentive Plan | First Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage per year	25%
Stock options | 2011 Equity Incentive Plan | Remaining Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	36 months
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 105,200	$ 98,500	$ 78,300
Weighted-average period of recognition	2 years 4 months 24 days

Stockholders' Equity - Stock _2

Stockholders' Equity - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Number of Shares
Options outstanding, beginning balance (in shares)	2,443
Granted (in shares)	602
Exercised (in shares)	(291)
Forfeited (in shares)	(44)
Options outstanding, ending balance (in shares)	2,710	2,443
Options vested and exercisable (in shares)	2,142
Weighted-Average  Exercise Price
Options outstanding, weighted average exercise price, beginning of period (in dollars per share)	$ 6.01
Granted, weighted-average exercise price (in dollars per share)	16.47
Exercised, weighted average exercise price (in dollars per share)	7.45
Forfeited, weighted average exercise price (in dollars per share)	8.41
Options outstanding, end of period (in dollars per share)	8.14	$ 6.01
Vested and exercisable, weighted-average exercise price (in dollars per share)	$ 5.94
Stock Option Activity, Additional Disclosures
Weighted-average remaining contractual period	5 years 1 month 6 days	4 years 8 months 12 days
Vested and exercisable, weighted average contractual term	3 years 9 months 18 days
Aggregate intrinsic value	$ 26,383	$ 7,674
Vested and exercisable, aggregate intrinsic value	$ 25,620

Stockholders' Equity - Fair Val

Stockholders' Equity - Fair Value Assumptions - Stock Options (Details) - Stock options	12 Months Ended
	Dec. 31, 2023 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of common stock (in dollars per share)	$ 16.47
Expected term (in years)	5 years 11 months 15 days
Risk-free interest rate	4.67%
Expected volatility	71.20%
Dividend yield	0%

Stockholders' Equity - Early Ex

Stockholders' Equity - Early Exercise of Stock Options (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) shares
Common Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares subject to repurchase (in shares) | shares	90,977
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan modification, number of awards affected (in shares) | shares	47,882
Plan modification, exercise value of awards affected | $	$ 0.2
Other long-term liabilities | $	$ 0.4

Stockholders' Equity - Restrict

Stockholders' Equity - Restricted Stock Units (Revest shares), Narrative (Details)		12 Months Ended
	Jan. 31, 2022 USD ($)	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 cofounder shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 136,303,000	$ 145,796,000	$ 140,488,000
Signal Sciences Corp
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares restricted for stock awards (in shares) | shares					896,499
Number of cofounders with shares subject to revesting | cofounder					3
Shares held back for restricted stock awards, revesting period					2 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share) | $ / shares		$ 15.80	$ 14.63	$ 54.92
Vested in period, grant date fair value		$ 127,300,000	$ 97,900,000	$ 67,700,000
Stock-based compensation expense		105,200,000	98,500,000	$ 78,300,000
Unrecognized stock-based compensation cost		$ 177,100,000
Weighted-average period of recognition		2 years 4 months 24 days
RSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
RSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
RSUs | First Year | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Award vesting percentage per year		25%
RSUs | First Year | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
Award vesting percentage per year		33%
RSUs | Remaining Period | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		24 months
RSUs | Remaining Period | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		36 months
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 0	27,600,000
Unrecognized stock-based compensation cost		0
Nonvested shares sold that remain unvested (in shares) | shares				224,124
Proceeds from nonvested shares sold	$ 10,700,000
Incremental cost due to plan modification		$ 0	$ 5,600,000

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of RSU, RSA , PSU and MPSU Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
RSUs
Number of Shares
Beginning balance (in shares)	11,990
Granted (in shares)	7,667
Vested (in shares)	(6,719)
Cancelled/forfeited (in shares)	(1,694)
Ending balance (in shares)	11,244	11,990
Weighted-Average Grant Date Fair Value Per Share
Beginning balance (in dollars per share)	$ 20.10
Granted (in dollars per share)	15.80	$ 14.63	$ 54.92
Vested (in dollars per share)	18.94
Cancelled/forfeited (in dollars per share)	22.80
Ending balance (in dollars per share)	$ 17.46	$ 20.10
PSUs
Number of Shares
Beginning balance (in shares)	267
Granted (in shares)	762
Vested (in shares)	(84)
Cancelled/forfeited (in shares)	(213)
Ending balance (in shares)	732	267
Weighted-Average Grant Date Fair Value Per Share
Beginning balance (in dollars per share)	$ 28.16
Granted (in dollars per share)	15.88
Vested (in dollars per share)	28.16
Cancelled/forfeited (in dollars per share)	24.35
Ending balance (in dollars per share)	$ 16.49	$ 28.16
MPSUs
Number of Shares
Beginning balance (in shares)	2,174
Granted (in shares)	87
Vested (in shares)	(540)
Cancelled/forfeited (in shares)	(250)
Ending balance (in shares)	1,471	2,174
Weighted-Average Grant Date Fair Value Per Share
Beginning balance (in dollars per share)	$ 6.80
Granted (in dollars per share)	7.25
Vested (in dollars per share)	7.84
Cancelled/forfeited (in dollars per share)	6.69
Ending balance (in dollars per share)	$ 6.46	$ 6.80

Stockholders' Equity - Performa

Stockholders' Equity - Performance Based Restricted Stock Units (PSUs) (Details) - USD ($) shares in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Mar. 29, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 136,303,000	$ 145,796,000	$ 140,488,000
2023 and 2022 Bonus Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of restricted stock units related to bonus program (in shares)	1.2
Shares issued under bonus program	$ 16,600,000
Performance Target Payout Level One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout of performance-based restricted stock units, percentage					50%
Performance Target Payout Level Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout of performance-based restricted stock units, percentage					100%
Performance Target Payout Level Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout of performance-based restricted stock units, percentage					150%
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		4,300,000	1,400,000	3,400,000
PSUs | 2022 Bonus Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 24,700,000	$ 14,900,000	$ 0

Stockholders' Equity - MPSU (De

Stockholders' Equity - MPSU (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 136,303	$ 145,796	$ 140,488
MPSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate, minimum	3.37%
Risk-free interest rate, maximum	3.68%
Expected volatility	80%
Stock-based compensation expense	$ 5,900
Unrecognized stock-based compensation cost	$ 4,700
Weighted-average period of recognition	3 years 10 months 24 days

Stockholders' Equity - ESPP (De

Stockholders' Equity - ESPP (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 136,303	$ 145,796	$ 140,488
Common Class A | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under ESPP (in shares)	1,022	516	236
Shares issuable pursuant to the ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum deduction percentage of eligible compensation	15%
Stock plan offering period	6 months
Purchase price of common stock, percentage of fair value	85%
Stock-based compensation expense	$ 4,100	$ 3,200	$ 3,500
Unrecognized stock-based compensation cost	$ 1,900
Weighted-average period of recognition	4 months 24 days

Stockholders' Equity - Fair V_2

Stockholders' Equity - Fair Value Assumptions - ESPP (Details) - Shares issuable pursuant to the ESPP - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)		5 months 26 days
Risk-free interest rate, minimum	4.65%	1.57%	0.02%
Risk-free interest rate, maximum	5.43%	4.65%	0.07%
Expected volatility, minimum	70%	88%	47%
Expected volatility, maximum	88%	101%	58%
Dividend yield	0%	0%	0%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of common stock (in dollars per share)	$ 3.33	$ 8.40	$ 41.24
Expected term (in years)	5 months 26 days		5 months 26 days
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of common stock (in dollars per share)	$ 6.09	$ 11.85	$ 44.87
Expected term (in years)	6 months		6 months

Stockholders' Equity - Equity A

Stockholders' Equity - Equity Awards Modification (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share-Based Payment Arrangement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense related to modification	$ 2	$ 3.1

Stockholders' Equity - Stock-ba

Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 136,303	$ 145,796	$ 140,488
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	11,656	12,050	7,227
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	47,827	58,435	47,019
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	33,703	39,083	31,159
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 43,117	$ 36,228	$ 55,083

Stockholders' Equity - Common_2

Stockholders' Equity - Common Stock Warrant Liabilities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Stock-based compensation capitalized to internal-use software	$ 10,100,000	$ 8,000,000	$ 4,400,000
Stock-based compensation expense	136,303,000	145,796,000	140,488,000
Liability Classified Awards
Class of Stock [Line Items]
Stock-based compensation expense	$ 24,700,000	$ 25,500,000	$ 0

Stockholders' Equity - Early _2

Stockholders' Equity - Early Exercise of Stock (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) shares
Common Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares subject to repurchase (in shares) | shares	90,977
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan modification, number of awards affected (in shares) | shares	47,882
Plan modification, exercise value of awards affected | $	$ 0.2
Other long-term liabilities | $	$ 0.4

Net Loss Per Share Attributab_3

Net Loss Per Share Attributable to Common Stockholders - Schedule of Computation of Basic and Diluted Net Loss Per Share of Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
	May 21, 2019	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)		128,770	121,723	116,053
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)		128,770	121,723	116,053
Net loss per share attributable to common stockholders, basic (in dollars per share)		$ (1.03)	$ (1.57)	$ (1.92)
Net loss per share attributable to common stockholders, diluted (in dollars per share)		$ (1.03)	$ (1.57)	$ (1.92)
Common Class A
Class of Stock [Line Items]
Net loss attributable to common stockholders, basic		$ (133,088)	$ (190,774)	$ (212,120)
Net loss attributable to common stockholders, diluted		$ (133,088)	$ (190,774)	$ (212,120)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)		128,770	121,723	110,541
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)		128,770	121,723	110,541
Net loss per share attributable to common stockholders, basic (in dollars per share)		$ (1.03)	$ (1.57)	$ (1.92)
Net loss per share attributable to common stockholders, diluted (in dollars per share)		$ (1.03)	$ (1.57)	$ (1.92)
Common Class A | IPO
Class of Stock [Line Items]
Shares issued (in shares)	12,900
Common Class B
Class of Stock [Line Items]
Net loss attributable to common stockholders, basic		$ 0	$ 0	$ (10,577)
Net loss attributable to common stockholders, diluted		$ 0	$ 0	$ (10,577)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)		0	0	5,512
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)		0	0	5,512
Net loss per share attributable to common stockholders, basic (in dollars per share)		$ 0	$ 0	$ (1.92)
Net loss per share attributable to common stockholders, diluted (in dollars per share)		$ 0	$ 0	$ (1.92)
Conversion of stock (in shares)	53,600

Net Loss Per Share Attributab_4

Net Loss Per Share Attributable to Common Stockholders - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	21,509	26,175	19,341
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	2,710	2,443	4,369
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	11,244	11,990	5,285
Revest shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0	0	336
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	732	267	71
MPSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	1,471	2,174	0
Bonus PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	1,572	1,777	0
Shares issuable pursuant to the ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	410	186	51
Convertible senior notes (if-converted)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	3,370	7,338	9,229

Income Taxes - Loss Before Inco

Income Taxes - Loss Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
United States	$ (137,240)	$ (196,469)	$ (224,159)
Foreign	3,931	5,789	1,531
Loss before income taxes	$ (133,309)	$ (190,680)	$ (222,628)

Income Taxes - Income Tax Expen

Income Taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current tax provision (benefit):
Federal	$ 0	$ 0	$ 0
State	57	(79)	0
Foreign	622	173	322
Deferred tax benefit:
Federal	0	0	(253)
State	0	0	0
Foreign	(900)	0	0
Income tax expense (benefit)	$ (221)	$ 94	$ 69

Income Taxes - Effective Tax Ra

Income Taxes - Effective Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Provision at federal statutory tax rate	21%	21%	21%
Change in valuation allowance	(25.00%)	(14.00%)	(30.00%)
Foreign tax rate differential	1%	0%	0%
Stock-based compensation	(4.00%)	(9.00%)	2%
Research and development credits	10%	2%	5%
Disallowed executive compensation	(3.00%)	0%	0%
Restructuring	0%	0%	2%
Effective tax rate	0%	0%	0%

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)	$ (221)	$ 94	$ 69
Valuation allowance, increase (released) amount	37,300
Unrecognized tax benefit that would impact income tax provision	23,200	17,300
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	626,400	658,800
Federal | Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	42,100
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	568,300	$ 528,900
State | Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	12,200
Foreign Tax Authority | UNITED KINGDOM
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 27,900

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Net operating losses	$ 178,149	$ 183,306
Lease liability	20,137	23,245
Research and development credits	38,280	21,383
Capitalized research and development	45,418	21,032
Stock-based compensation	11,765	10,429
Deferred revenue	4,934	2,811
Reserves and accruals	4,336	4,648
Other	1,889	4,179
Deferred tax assets	304,908	271,033
Intangible asset amortization	(16,310)	(21,713)
Right-of-use asset	(15,322)	(18,847)
State taxes	(13,032)	(10,732)
Prepaid commissions	(13,868)	(11,526)
Deferred tax liabilities	(58,532)	(62,818)
Valuation allowance	(245,476)	(208,215)
Net deferred tax (liabilities) assets	$ 900
Net deferred tax (liabilities) assets		$ 0

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Unrecognized Tax Benefits:
Balance at beginning of year	$ 17,337	$ 7,808
Increases related to prior year tax positions	2,674	8,697
Decreases related to prior year tax positions	0	(751)
Increases related to current year tax positions	3,234	1,583
Balance at end of year	$ 23,245	$ 17,337

Information About Revenue and_3

Information About Revenue and Geographic Areas (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 231,820	$ 248,818
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	166,413	175,794
All other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 65,407	$ 73,024