Fastly (FSLY) 10-Q 3 Nov 22 2022 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares shares in Millions	9 Months Ended
	Sep. 30, 2022	Oct. 28, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		123
Entity Central Index Key	0001517413
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Amendment Flag	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 87,897	$ 166,068
Marketable securities, current	445,048	361,795
Accounts receivable, net of allowance for credit losses of $4,949 and $3,311 as of September 30, 2022 and December 31, 2021, respectively	72,914	64,625
Prepaid expenses and other current assets	31,321	32,160
Total current assets	637,180	624,648
Property and equipment, net	179,080	166,961
Operating lease right-of-use assets, net	72,374	69,631
Goodwill	670,158	636,805
Intangible assets, net	88,482	102,596
Marketable securities, non-current	186,066	528,911
Other assets	73,258	29,468
Total assets	1,906,598	2,159,020
Current liabilities:
Accounts payable	8,265	9,257
Accrued expenses	54,186	36,112
Finance lease liabilities, current	27,807	21,125
Operating lease liabilities, current	20,919	20,271
Other current liabilities	33,422	45,107
Total current liabilities	144,599	131,872
Long-term debt	704,042	933,205
Finance lease liabilities, noncurrent	21,027	22,293
Operating lease liabilities, noncurrent	62,750	55,114
Other long-term liabilities	7,201	2,583
Total liabilities	939,619	1,145,067
Commitments and contingencies (Note 10)
Stockholders’ equity:
Class A common stock	2	2
Additional paid-in capital	1,634,666	1,527,468
Accumulated other comprehensive loss	(12,678)	(2,627)
Accumulated deficit	(655,011)	(510,890)
Total stockholders’ equity	966,979	1,013,953
Total liabilities and stockholders’ equity	$ 1,906,598	$ 2,159,020

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 4,949	$ 3,311

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenue	$ 108,504	$ 86,735	$ 313,404	$ 256,613
Cost of revenue	55,825	41,244	166,206	119,058
Gross profit	52,679	45,491	147,198	137,555
Operating expenses:
Research and development	38,957	32,528	118,111	91,862
Sales and marketing	47,006	39,288	135,246	110,494
General and administrative	32,481	28,609	91,578	97,564
Total operating expenses	118,444	100,425	344,935	299,920
Loss from operations	(65,765)	(54,934)	(197,737)	(162,365)
Net gain on extinguishment of debt	0	0	54,391	0
Interest income	1,967	280	4,150	730
Interest expense	(1,381)	(1,555)	(4,533)	(3,652)
Other income (expense)	1,877	41	(75)	155
Loss before income taxes	(63,302)	(56,168)	(143,804)	(165,132)
Income tax expense	118	30	317	44
Net loss	$ (63,420)	$ (56,198)	$ (144,121)	$ (165,176)
Net loss per share attributable to common stockholders, basic (in US dollar per share)	$ (0.52)	$ (0.48)	$ (1.19)	$ (1.43)
Net loss per share attributable to common stockholders, diluted (in US dollar per share)	$ (0.52)	$ (0.48)	$ (1.19)	$ (1.43)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	122,339	116,475	121,094	115,320
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	122,339	116,475	121,094	115,320

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Other Comprehensive Income [Abstract]
Net loss	$ (63,420)	$ (56,198)	$ (144,121)	$ (165,176)
Other comprehensive loss:
Foreign currency translation loss	(22)	(186)	(192)	(228)
Loss on investments in available-for-sale-securities	(114)	27	(9,859)	(198)
Total other comprehensive loss	(136)	(159)	(10,051)	(426)
Comprehensive loss	$ (63,556)	$ (56,357)	$ (154,172)	$ (165,602)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock Common Stock—Class A	Common Stock Common Stock—Class A Vesting of restricted stock units	Common Stock Common Stock—Class A Vesting of restricted stock awards	Common Stock Common Stock—Class B	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020		103,394			10,229
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 vested stock options (in shares)		1,527
Exercise of vested stock options	9,094					9,094
Vesting of early exercised stock options (in shares)					43
Vesting of early exercised stock options	192					192
Vesting of restricted stock units/awards (in shares)			1,520	336
Shares issued under ESPP (in shares)		154
Shares issued under ESPP	5,719					5,719
Stock-based compensation	104,311					104,311
Conversion of Class B to Class A Stock (in shares)		10,272			(10,272)
Conversion of Class B to Class A Stock		$ 1			$ (1)
Net loss	(165,176)							(165,176)
Other comprehensive income (loss)	(426)						(426)
Ending balance (in shares) at Sep. 30, 2021		117,203			0
Ending balance at Sep. 30, 2021	1,015,579	$ 2			$ 0	1,469,366	(420)	(453,369)
Beginning balance (in shares) at Jun. 30, 2021		106,259			9,708
Beginning balance at Jun. 30, 2021	1,029,090	$ 1			$ 1	1,426,520	(261)	(397,171)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of vested stock options (in shares)		498
Exercise of vested stock options	3,489					3,489
Vesting of early exercised stock options (in shares)					14
Vesting of early exercised stock options	64					64
Vesting of restricted stock units/awards (in shares)			611	112
Stock-based compensation	39,293					39,293
Conversion of Class B to Class A Stock (in shares)		9,723			(9,723)
Conversion of Class B to Class A Stock		$ 1			$ (1)
Net loss	(56,198)							(56,198)
Other comprehensive income (loss)	(159)						(159)
Ending balance (in shares) at Sep. 30, 2021		117,203			0
Ending balance at Sep. 30, 2021	1,015,579	$ 2			$ 0	1,469,366	(420)	(453,369)
Beginning balance (in shares) at Dec. 31, 2021		118,811
Beginning balance at Dec. 31, 2021	$ 1,013,953	$ 2				1,527,468	(2,627)	(510,890)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of vested stock options (in shares)	1,712	1,712
Exercise of vested stock options	$ 5,324					5,324
Vesting of restricted stock units/awards (in shares)			1,918	112
Shares issued under ESPP (in shares)		292
Shares issued under ESPP	2,962					2,962
Stock-based compensation	98,912					98,912
Net loss	(144,121)							(144,121)
Other comprehensive income (loss)	(10,051)						(10,051)
Ending balance (in shares) at Sep. 30, 2022		122,845
Ending balance at Sep. 30, 2022	966,979	$ 2				1,634,666	(12,678)	(655,011)
Beginning balance (in shares) at Jun. 30, 2022		121,885
Beginning balance at Jun. 30, 2022	993,738	$ 2				1,597,869	(12,542)	(591,591)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of vested stock options (in shares)		88
Exercise of vested stock options	555					555
Vesting of restricted stock units/awards (in shares)			835	37
Stock-based compensation	36,242					36,242
Net loss	(63,420)							(63,420)
Other comprehensive income (loss)	(136)						(136)
Ending balance (in shares) at Sep. 30, 2022		122,845
Ending balance at Sep. 30, 2022	$ 966,979	$ 2				$ 1,634,666	$ (12,678)	$ (655,011)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (144,121,000)	$ (165,176,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	31,248,000	20,710,000
Amortization of intangible assets	16,114,000	15,929,000
Amortization of right-of-use assets and other	21,879,000	19,818,000
Amortization of debt discount and issuance costs	2,454,000	2,235,000
Amortization of deferred contract costs	6,020,000	4,567,000
Stock-based compensation	114,378,000	100,900,000
Provision for credit losses	1,782,000	41,000
Interest on finance lease	(1,843,000)	(1,259,000)
Loss on disposals of property and equipment	854,000	(177,000)
Amortization and accretion of discounts and premiums on investments	2,622,000	0
Net gain on extinguishment of debt	(54,391,000)	0
Other adjustments	(292,000)	1,496,000
Changes in operating assets and liabilities:
Accounts receivable	(10,071,000)	(4,017,000)
Prepaid expenses and other current assets	(5,787,000)	(5,502,000)
Other assets	(19,904,000)	(7,320,000)
Accounts payable	(3,457,000)	(1,653,000)
Accrued expenses	4,490,000	2,713,000
Operating lease liabilities	(20,667,000)	(19,735,000)
Other liabilities	1,188,000	5,856,000
Net cash used in operating activities	(57,504,000)	(30,574,000)
Cash flows from investing activities:
Purchases of marketable securities	(355,479,000)	(777,569,000)
Sales of marketable securities	161,853,000	64,236,000
Maturities of marketable securities	440,737,000	72,853,000
Business acquisitions, net of cash acquired and other related payments	(27,745,000)	0
Advance payment for purchase of property and equipment	(31,274,000)	0
Purchases of property and equipment	(11,446,000)	(31,267,000)
Proceeds from sale of property and equipment	366,000	291,000
Capitalized internal-use software	(13,856,000)	(10,299,000)
Purchase of intangible assets	0	(2,092,000)
Net cash provided by (used in) investing activities	163,156,000	(683,847,000)
Cash flows from financing activities:
Issuance of convertible note, net of issuance costs	0	930,775,000
Payments of other debt issuance costs	0	(1,351,000)
Net cash paid for debt extinguishment	(177,082,000)	0
Repayments of finance lease liabilities	(18,105,000)	(10,564,000)
Cash received for restricted stock sold in advance of vesting conditions	10,655,000	0
Cash paid for early sale of restricted shares	(10,655,000)	0
Proceeds from exercise of vested stock options	5,324,000	9,094,000
Proceeds from employee stock purchase plan	5,726,000	5,994,000
Net cash provided by (used in) financing activities	(184,137,000)	933,948,000
Effects of exchange rate changes on cash, cash equivalents, and restricted cash	(429,000)	(383,000)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(78,914,000)	219,144,000
Cash, cash equivalents, and restricted cash at beginning of period	166,961,000	63,880,000
Cash, cash equivalents, and restricted cash at end of period	88,047,000	283,024,000
Supplemental disclosure of cash flow information:
Cash paid for interest	1,969,000	1,379,000
Cash paid for income taxes, net of refunds received	225,000	240,000
Property and equipment additions not yet paid in cash	8,497,000	443,000
Stock-based compensation capitalized to internal-use software	6,034,000	3,411,000
Assets obtained in exchange for operating lease obligations	28,788,000	25,745,000
Assets obtained in exchange for finance lease obligations	23,521,000	28,399,000
Net non-cash change in operating lease assets and liabilities associated with modifications and terminations	3,132,000	0
Purchase consideration associated with business combination, accrued but not paid	8,000,000	0
Costs associated with business combination, accrued but not paid	30,000	0
Deployments of prepaid capital equipment	926,000	0
Reconciliation of cash, cash equivalents, and restricted cash as shown in the statements of cash flows:
Cash and cash equivalents	87,897,000	282,131,000
Restricted cash, current	150,000	0
Restricted cash, non-current	0	893,000
Total cash, cash equivalents, and restricted cash	$ 88,047,000	$ 283,024,000

Nature of Business

Nature of Business	9 Months Ended
	Sep. 30, 2022
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 September 30, 2022, 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," "we," "our," "the Company," 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	9 Months Ended
	Sep. 30, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation and Consolidation The accompanying condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”), consistent in all material respects with those applied in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2021, filed with the Securities and Exchange Commission (“SEC”) on March 1, 2022. The Company's condensed consolidated financial statements include its accounts and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. The Company's condensed consolidated financial statements are unaudited but include all adjustments of a normal recurring nature necessary for a fair presentation of its quarterly results. The Company's condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2021. Certain changes to presentation have been made to conform the prior period presentation to the current period reporting. Such reclassifications did not affect the condensed consolidated balance sheets, total revenues, operating income, or net income. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates, judgements and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and also on assumptions that it believes are reasonable. Due to the Coronavirus (“COVID-19”) pandemic there has been uncertainty and disruption in the global economy and financial markets. The Company is not aware of any specific event or circumstance that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities as of September 30, 2022. These estimates may change, as new events occur and additional information is obtained, as well as other factors related to COVID-19 that could result in material impacts to the Company's consolidated financial statements in future reporting periods. Significant Accounting Policies There have been no material changes to the Company's significant accounting policies as compared to those described in “Note 2 – Summary of Significant Accounting Policies” of the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2021. Recently Adopted and Issued Accounting Pronouncements The Company has not adopted any new accounting pronouncements in the three and nine months ended September 30, 2022. Other recently issued accounting pronouncements are not expected to have a material impact on its condensed consolidated financial statements. 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, municipal securities, foreign government and supranational securities and asset-backed securities held at major financial institutions. 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.

Revenue

Revenue	9 Months Ended
	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Revenue	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 both the three and nine months ended September 30, 2022 and September 30, 2021. The following table presents the Company's net revenue by geographic region: Three months ended September 30, Nine months ended September 30, 2022 2021 2022 2021 (in thousands) United States $ 80,173 $ 62,287 $ 231,838 $ 179,860 Asia Pacific 14,365 9,804 38,954 27,969 Europe 9,536 8,550 28,131 25,969 All other 4,430 6,094 14,481 22,815 Total revenue $ 108,504 $ 86,735 $ 313,404 $ 256,613 The majority of the Company's revenue is derived from enterprise customers, which are defined as customers with revenue in excess of $100,000 over the previous 12-month period. The following table presents the Company's net revenue for enterprise and non-enterprise customers: Three months ended September 30, Nine months ended September 30, 2022 2021 2022 2021 (in thousands) Enterprise customers $ 97,265 $ 76,006 $ 279,619 $ 226,622 Non-enterprise customers 11,239 10,729 33,785 29,991 Total revenue $ 108,504 $ 86,735 $ 313,404 $ 256,613 Contract balances The following table presents the Company's contract assets and contract liabilities as of September 30, 2022 and as of December 31, 2021: As of September 30, 2022 As of December 31, 2021 (in thousands) Contract assets $ 26 $ 89 Contract liabilities $ 25,940 $ 28,907 The Company's payment terms and conditions vary by contract type. Payment terms on invoiced amounts are at a weighted average of 40 days. The following table presents the revenue recognized during the three and nine months ended September 30, 2022 and 2021 from amounts included in the contract liability at the beginning of the period: Three months ended September 30, Nine months ended September 30, 2022 2021 2022 2021 (in thousands) Revenue recognized in the period from amounts included in contract liability at the beginning of the period $ 10,627 $ 8,815 $ 23,231 $ 13,942 Remaining performance obligations As of September 30, 2022, the Company had $173.0 million of remaining performance obligations, which includes deferred revenue and amounts that will be invoiced and recognized in future periods. As of September 30, 2022, the Company expects to recognize approximately 78% of this balance over the next 12 months in the Company's condensed consolidated statement of operations and comprehensive loss. The typical contract term with the Company's customers is one year, although terms may vary by contract. Costs to obtain a contract As of September 30, 2022 and December 31, 2021, the Company's costs to obtain contracts were as follows: As of September 30, As of December 31, 2022 2021 (in thousands) Deferred contract costs, net $ 35,524 $ 23,830

Investments and Fair Value Meas

Investments and Fair Value Measurements	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Investments and Fair Value Measurements	Investments and Fair Value Measurements The Company's total cash, cash equivalents and marketable securities as of September 30, 2022 and December 31, 2021 consisted of the following: As of September 30, As of December 31, 2022 2021 (in thousands) Cash and cash equivalents: Cash $ 42,673 $ 134,774 Money market funds 45,224 31,294 Total cash and cash equivalents (1) $ 87,897 $ 166,068 Marketable securities: U.S. Treasury securities $ 327,868 $ 184,946 Corporate notes and bonds 84,342 11,327 Commercial paper 6,498 124,089 Asset-backed securities 6,464 21,576 Municipal securities — 2,250 Foreign government and supranational securities 19,876 17,607 Total marketable securities, current (2) $ 445,048 $ 361,795 U.S. Treasury securities — 239,528 Corporate notes and bonds 152,773 197,298 Asset-backed securities 31,077 77,142 Municipal securities 2,216 2,312 Foreign government and supranational securities — 12,631 Total marketable securities, non-current (3) $ 186,066 $ 528,911 Total marketable securities $ 631,114 $ 890,706 Total cash, cash equivalents and marketable securities $ 719,011 $ 1,056,774 (1) The Company's cash equivalents include investments with an original maturity date of three months or less. (2) The Company classifies its marketable securities as current, where it intends to hold the securities for less than 12 months. (3) The Company classifies its marketable securities are non-current, where it intends to hold the securities for longer than 12 months. Available-for-Sale Investments The Company’s marketable securities are classified as available-for-sale as of the balance sheet date and 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. The following table summarizes adjusted cost, gross unrealized gains and losses, and fair value related to available-for-sale securities classified as marketable securities as of September 30, 2022 and December 31, 2021: As of September 30, 2022 Amortized Gross Gross Fair (in thousands) U.S. Treasury securities $ 333,851 $ — $ (5,983) $ 327,868 Corporate notes and bonds 242,536 — (5,421) 237,115 Commercial paper 6,498 — — 6,498 Asset-backed securities 37,938 — (397) 37,541 Municipal securities 2,323 — (107) 2,216 Foreign government and supranational securities 20,070 — (194) 19,876 Total available-for-sale investments $ 643,216 $ — $ (12,102) $ 631,114 As of December 31, 2021 Amortized Gross Gross Fair (in thousands) U.S. Treasury securities $ 425,560 $ 1 $ (1,086) $ 424,475 Corporate notes and bonds 209,550 — (925) 208,625 Commercial paper 124,098 — (9) 124,089 Asset-backed securities 98,857 — (140) 98,717 Municipal securities 4,577 — (15) 4,562 Foreign government and supranational securities 30,306 — (68) 30,238 Total available-for-sale investments $ 892,948 $ 1 $ (2,243) $ 890,706 There were no material realized gains or losses from sales of marketable securities that were reclassified out of accumulated other comprehensive (loss) income into investment income during the three and nine months ended September 30, 2022 and 2021. There were 19 securities in a continuous loss position for 12 months or longer as of September 30, 2022. No securities were in a continuous loss position for 12 months or longer as of December 31, 2021. Investments are reviewed periodically to identify possible other-than-temporary impairments. No impairment loss has been recorded on the securities included in either of the periods as the Company believes that the decrease in fair value of these securities is temporary. The Company does not intend to sell the 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. 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 fair value of the Company's Level 1 financial assets is based on quoted market prices of the identical underlying security. The fair value of the Company's Level 2 financial assets is based on inputs that are directly or indirectly observable in the market, including the readily available pricing sources for the identical underlying security that may not be actively traded. Financial assets and liabilities measured and recorded at fair value on a recurring basis consisted of the following types of instruments: As of September 30, 2022 Level 1 Level 2 Level 3 Total (in thousands) Cash equivalents: Money market funds $ 45,224 $ — $ — $ 45,224 Total cash equivalents 45,224 — — 45,224 Marketable securities: Corporate notes and bonds — 237,115 — 237,115 Commercial paper — 6,498 — 6,498 U.S. Treasury securities — 327,868 — 327,868 Municipal securities — 2,216 — 2,216 Asset-backed securities — 37,541 — 37,541 Foreign government and supranational securities — 19,876 — 19,876 Total marketable securities — 631,114 — 631,114 Restricted cash: Restricted cash, current 150 — — 150 Total restricted cash 150 — — 150 Total financial assets $ 45,374 $ 631,114 $ — $ 676,488 As of December 31, 2021 Level 1 Level 2 Level 3 Total (in thousands) Cash equivalents: Money market funds $ 31,294 $ — $ — $ 31,294 Total cash equivalents 31,294 — — 31,294 Marketable securities: U.S. Treasury securities — 424,475 — 424,475 Corporate notes and bonds — 208,625 — 208,625 Commercial paper — 124,089 — 124,089 Asset-backed securities — 98,717 — 98,717 Municipal securities — 4,562 — 4,562 Foreign government and supranational securities — 30,238 — 30,238 Total marketable securities — 890,706 — 890,706 Restricted cash: Restricted cash, non-current 893 — — 893 Total restricted cash 893 — — 893 Total financial assets $ 32,187 $ 890,706 $ — $ 922,893 The Company classifies its investments, which are comprised of corporate notes and bonds, commercial paper, U.S. treasury securities, 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. Restricted cash was $0.2 million and $0.9 million as of September 30, 2022 and December 31, 2021, respectively. 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 September 30, 2022 and December 31, 2021, were classified as current and non-current, respectively, on the Company's Condensed Consolidated Balance Sheets. There were no transfers of assets and liabilities measured at fair value between Level 1 and Level 2, or between Level 2 and Level 3, during the three and nine months ended September 30, 2022 and 2021.

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2022
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 has been held back as security for indemnification claims under the terms of the merger agreement ("Holdback"). The Holdback will be distributed to the shareholders of Glitch between 12 and 24 months following acquisition closing date. The acquisition is expected to expand the Company's brand awareness within the developer community and bolster 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 $32.6 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. The fair values assigned to tangible and intangible assets acquired and liabilities assumed are based on management’s estimates and assumptions and may be subject to change as additional information is received. The provisional measurements of fair value for income taxes payable and deferred taxes may be subject to change as additional information is received and certain tax returns are finalized. The Company expects to finalize the fair value measurements as soon as practicable, but not later than one year from the acquisition date. 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 three months ended September 30, 2022 we did not incur any acquisition-related expenses. For the nine months ended September 30, 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 condensed consolidated financial statements. Pro forma revenue and results of operations have not been presented because the historical results are not material to the condensed consolidated financial statements in any period presented.

Balance Sheet Information

Balance Sheet Information	9 Months Ended
	Sep. 30, 2022
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Information	Balance Sheet Information Property and equipment, net Property and equipment, net consisted of the following: As of September 30, As of December 31, 2022 2021 (in thousands) Computer and networking equipment $ 215,102 $ 207,575 Leasehold improvements 7,970 4,631 Furniture and fixtures 1,599 1,606 Office equipment 1,214 654 Internal-use software 60,235 40,345 Property and equipment, gross $ 286,120 $ 254,811 Accumulated depreciation and amortization (107,040) (87,850) Property and equipment, net $ 179,080 $ 166,961 Depreciation on property and equipment for the three months ended September 30, 2022 and 2021 was approximately $10.7 million and $7.4 million, respectively. Included in these amounts was amortization expense for capitalized internal-use software costs of approximately $2.4 million and $1.3 million for the three months ended September 30, 2022 and 2021, respectively. Depreciation on property and equipment for the nine months ended September 30, 2022 and 2021 was approximately $31.2 million and $20.7 million, respectively. Included in these amounts was amortization expense for capitalized internal-use software costs of approximately $6.0 million and $3.2 million for the nine months ended September 30, 2022 and 2021, respectively. The Company also recorded out-of-period adjustments in the quarter ended September 30, 2021 to correct and capitalize certain internal-use software costs that were previously expensed of $5.1 million, of which $2.4 million and $2.7 million related to the quarterly periods ended March 31, 2021 and June 30, 2021, respectively. As of September 30, 2022 and December 31, 2021, the unamortized balance of capitalized internal-use software costs on the Company's Condensed Consolidated Balance Sheets was approximately $41.8 million and $27.9 million, respectively. The Company leases certain networking equipment from various third parties through equipment finance leases. The Company's networking equipment assets as of September 30, 2022 and December 31, 2021, included a total of $87.2 million and $67.8 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 $24.7 million and $14.4 million as of September 30, 2022 and December 31, 2021, respectively. Other assets Other assets consisted of the following: As of September 30, As of December 31, 2022 2021 (in thousands) Deferred contract costs, net $ 35,524 $ 23,830 Advance payment for purchase of property and equipment 30,348 — Other assets 7,386 5,638 Total other assets $ 73,258 $ 29,468 Accrued expenses Accrued expenses consisted of the following: As of September 30, As of December 31, 2022 2021 (in thousands) Accrued compensation and related benefits $ 28,520 $ 13,543 Accrued colocation and bandwidth costs 9,684 10,205 Sales and use tax liabilities 9,414 8,070 Other accrued liabilities 6,568 4,294 Total accrued expenses $ 54,186 $ 36,112 Other current liabilities Other current liabilities consisted of the following: As of September 30, As of December 31, 2022 2021 (in thousands) Deferred revenue, current $ 22,727 $ 26,421 Accrued computer and networking equipment 5,840 18,081 Holdback payable 4,013 — Other current liabilities 842 605 Total other current liabilities $ 33,422 $ 45,107

Leases

Leases	9 Months Ended
	Sep. 30, 2022
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 leases have remaining lease terms ranging from less than 1 year to 8 years, some of which include options to extend the leases. The Company also subleases a portion of its corporate office spaces. The Company's subleases have an average remaining lease terms of 2 years. The Company's sublease income was $0.2 million for both the three months ended September 30, 2022, and 2021. The Company's sublease income was $0.7 million for both the nine months ended September 30, 2022 and 2021. The Company's components of lease cost were as follows: Three months ended September 30, Nine months ended September 30, 2022 2021 2022 2021 (in thousands) Operating lease cost: Operating lease cost $ 9,336 $ 7,018 $ 23,578 $ 19,741 Variable lease cost 1,456 1,806 8,723 4,624 Total operating lease costs $ 10,792 $ 8,824 $ 32,301 $ 24,365 Finance lease cost: Amortization of assets under finance lease $ 3,717 $ 4,124 $ 10,901 $ 6,608 Interest 602 524 1,843 1,259 Total finance lease costs $ 4,319 $ 4,648 $ 12,744 $ 7,867 Other information related to leases was as follows: As of September 30, As of As of December 31, 2022 2021 Weighted Average Remaining Lease Term (in years): Operating leases 4.34 4.41 Finance leases 1.95 2.23 Weighted Average Discount Rate: Operating leases 5.28 % 5.20 % Finance leases 4.74 % 4.86 % Future minimum lease payments under non-cancellable leases as of September 30, 2022 were as follows: Operating Leases Finance Leases (in thousands) Remainder of 2022 $ 6,099 $ 9,544 2023 23,351 25,640 2024 19,481 14,282 2025 17,463 1,618 2026 16,859 — Thereafter 12,538 — Total future minimum lease payments $ 95,791 $ 51,084 Less: imputed interest (10,673) (2,250) Total liability $ 85,118 $ 48,834
Leases	Leases The Company has operating leases for corporate offices and data centers ("colocation leases"), and finance leases for networking equipment. The Company's leases have remaining lease terms ranging from less than 1 year to 8 years, some of which include options to extend the leases. The Company also subleases a portion of its corporate office spaces. The Company's subleases have an average remaining lease terms of 2 years. The Company's sublease income was $0.2 million for both the three months ended September 30, 2022, and 2021. The Company's sublease income was $0.7 million for both the nine months ended September 30, 2022 and 2021. The Company's components of lease cost were as follows: Three months ended September 30, Nine months ended September 30, 2022 2021 2022 2021 (in thousands) Operating lease cost: Operating lease cost $ 9,336 $ 7,018 $ 23,578 $ 19,741 Variable lease cost 1,456 1,806 8,723 4,624 Total operating lease costs $ 10,792 $ 8,824 $ 32,301 $ 24,365 Finance lease cost: Amortization of assets under finance lease $ 3,717 $ 4,124 $ 10,901 $ 6,608 Interest 602 524 1,843 1,259 Total finance lease costs $ 4,319 $ 4,648 $ 12,744 $ 7,867 Other information related to leases was as follows: As of September 30, As of As of December 31, 2022 2021 Weighted Average Remaining Lease Term (in years): Operating leases 4.34 4.41 Finance leases 1.95 2.23 Weighted Average Discount Rate: Operating leases 5.28 % 5.20 % Finance leases 4.74 % 4.86 % Future minimum lease payments under non-cancellable leases as of September 30, 2022 were as follows: Operating Leases Finance Leases (in thousands) Remainder of 2022 $ 6,099 $ 9,544 2023 23,351 25,640 2024 19,481 14,282 2025 17,463 1,618 2026 16,859 — Thereafter 12,538 — Total future minimum lease payments $ 95,791 $ 51,084 Less: imputed interest (10,673) (2,250) Total liability $ 85,118 $ 48,834

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets The changes in the carrying amount of goodwill for the nine months ended September 30, 2022 are as follows: Nine months ended September 30, 2022 (in thousands) Balance as of December 31, 2021 $ 636,805 Goodwill acquired from business combinations 33,419 Foreign currency translation and other adjustments (66) Balance as of September 30, 2022 $ 670,158 The Company did not record an impairment charge on goodwill during either of the three and nine months ended September 30, 2022 or 2021. As of September 30, 2022 and December 31, 2021, the Company's intangible assets consisted of the following: As of September 30, 2022 As of December 31, 2021 Gross carrying value Accumulated amortization Net carrying value Gross carrying value Accumulated amortization Net carrying value (in thousands) Intangible assets: Customer relationships $ 69,860 $ (17,359) $ 52,501 $ 69,100 $ (10,797) $ 58,303 Developed technology 50,130 (19,853) 30,277 49,500 (12,375) 37,125 Trade names 3,910 (2,251) 1,659 3,300 (1,375) 1,925 Internet protocol addresses 4,984 (1,346) 3,638 4,984 (973) 4,011 Backlog 2,200 (2,200) — 2,200 (1,375) 825 In-process research and development ("IPR&D") 368 — 368 368 — 368 Domain name 39 — 39 39 — 39 Total intangible assets $ 131,491 $ (43,009) $ 88,482 $ 129,491 $ (26,895) $ 102,596 The Company's customer relationships, developed technology, trade names, internet protocol addresses, backlog and domain name intangible assets are subject to amortization. IPR&D is indefinite-lived that is not subject to amortization. Amortization expense was $5.5 million and $5.3 million for the three months ended September 30, 2022 and 2021, respectively. Amortization expense was $16.1 million and $15.9 million for the nine months ended September 30, 2022 and 2021, respectively. Other than the acquired intangible assets described in Note 5 - Business Combinations, the Company did not purchase any intangible assets during the three and nine months ended September 30, 2022. The Company did not record any impairment charges on its intangible assets during both the three and nine months ended September 30, 2022 and 2021. The expected amortization expense of intangible assets subject to amortization as of September 30, 2022 is as follows: As of September 30, 2022 (in thousands) Remainder of 2022 $ 5,198 2023 20,437 2024 19,603 2025 16,977 2026 9,193 Thereafter 16,706 Total $ 88,114

Debt Instruments

Debt Instruments	9 Months Ended
	Sep. 30, 2022
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 Silicon Valley Bank ("SVB") 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 condensed consolidated balance sheet. The Credit Agreement bears interest at a rate per annum equal to the sum of LIBOR for the applicable interest period plus 1.75% - 2.00%, 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% - 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 to 1:00 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 to 1:00 on the last day of any fiscal quarter. The Credit Agreement requires the Company to comply with these affirmative and negative covenants. As of September 30, 2022, the Company was in compliance with all of its covenants. During the three and nine months ended September 30, 2022 and 2021, no amounts were drawn down on the Company's Credit Agreement. As of September 30, 2022 and December 31, 2021, 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 the Company's 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 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 condensed 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 September 30, 2022, 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”) approximately $235.0 million aggregate principal amount of the Notes for an aggregate cash repurchase price of approximately $176.4 million. The Repurchases closed on May 31, 2022. 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 condensed consolidated statement of operations in the nine months ended September 30, 2022. For the three months ended September 30, 2022 the Company did not enter into transactions associated with its Notes. The following table reflects the carrying values of the debt agreements as of September 30, 2022 and December 31, 2021: As of September 30, 2022 As of December 31, 2021 (in thousands) (in thousands) Convertible Senior notes (effective interest rate of 0.40%) Principal amount $ 713,753 $ 948,750 Less: unamortized debt issuance costs (9,711) (15,545) Less: current portion of long-term debt — — Long-term debt, less current portion $ 704,042 $ 933,205

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Purchase Commitments As of September 30, 2022, the Company had long-term commitments for cost of revenue related agreements (i.e., bandwidth usage, peering and other managed services with various networks, internet service providers ("ISPs") and other third-party vendors). The Company also has long-term commitments for various non-cancelable software as a service ("SaaS") 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 its purchase commitments as of September 30, 2022 were as follows: Cost of Revenue Commitments SaaS Agreements Total Purchase Commitments (in thousands) Remainder of 2022 $ 13,873 $ 7,333 $ 21,206 2023 32,962 17,882 50,844 2024 10,151 1,184 11,335 2025 311 277 588 2026 166 — 166 Thereafter 89 — 89 Total $ 57,552 $ 26,676 $ 84,228 In addition to the commitments disclosed above, as of September 30, 2022, the Company has $26.7 million of long-term purchase obligations under contracts for capital expenditures and $4.6 million for other long-term contracts. Sales and Use Tax Reserve 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 U.S. 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 $8.5 million and $7.5 million as of September 30, 2022 and December 31, 2021, respectively. These estimates are based on several key assumptions, including the taxability of the Company's products, the jurisdictions in which the Company believe 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 September 30, 2022, 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 gross 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 have 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	9 Months Ended
	Sep. 30, 2022
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders' Equity 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 ("ESPP") 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. As of September 30, 2022 and December 31, 2021, there were 9.8 million and 15.9 million Class A common stock available for issuance under the 2019 Plan, respectively. As of September 30, 2022 and December 31, 2021, 122.8 million and 118.8 million shares of Class A common stock were issued and outstanding, respectively. 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 nine months ended September 30, 2022: Shares Weighted- Weighted- Aggregate (in thousands) (in years) (in thousands) Outstanding at December 31, 2021 4,369 5.07 5.10 $ 132,721 Granted — — Exercised (1,712) 3.11 Cancelled/forfeited (143) 12.14 Outstanding at September 30, 2022 2,514 6.01 5.10 $ 9,912 Vested and exercisable at September 30, 2022 2,328 5.58 5.00 $ 9,805 During the three months ended September 30, 2022 and 2021, the Company recorded stock-based compensation expense from stock options of approximately $1.9 million and $5.3 million, respectively. During the nine months ended September 30, 2022 and 2021, the Company recorded stock-based compensation expense from stock options of approximately $5.1 million and $13.4 million, respectively. During the three and nine months ended September 30, 2022, we modified the terms of options awarded to certain employees upon their change in employment status. As a result, we recorded incremental stock-based compensation expense in relation to these modifications of $0.7 million and $0.8 million, respectively, during the three and nine months ended September 30, 2022. During the three and nine months ended September 30, 2021, we modified the terms of options awarded to certain employees upon their change in employment status. As a result, we recorded stock-based compensation expense of $2.4 million and $3.7 million during three and nine months ended September 30, 2021, respectively, in relation to such modifications. Included in the expense for the three and nine months ended September 30, 2021 are incremental fair value adjustments of $2.1 million and $3.3 million, respectively. 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 four years, at the rate of 25% on the first anniversary of the vest date and ratably on a quarterly basis over the remaining 36-month period thereafter. RSUs granted to existing employees typically vest in equal quarterly installments over a four-year service period. All vesting is contingent on continued service. Forfeitures are recognized as they occur. The following table summarizes RSU activity during the nine months ended September 30, 2022: Number of Shares Weighted-Average (in thousands) Unvested RSUs as of December 31, 2021 5,285 $ 42.80 Granted 11,088 15.00 Vested (1,918) 35.41 Cancelled/forfeited (1,474) 32.54 Unvested RSUs as of September 30, 2022 12,981 $ 21.32 During the three months ended September 30, 2022 and 2021, the Company recognized stock-based compensation expense related to RSUs of $27.8 million and $23.0 million, respectively. During the nine months ended September 30, 2022 and 2021, the Company recognized stock-based compensation expense related to RSUs of $72.9 million and $52.0 million, respectively. During the three and nine months ended September 30, 2022, we modified the terms of RSUs awarded to certain employees upon their change in employment status. As a result, we recorded incremental stock-based compensation expense in relation to the modification of $1.9 million in both the three and nine months ended September 30, 2022. During the three and nine months ended September 30, 2021, we modified the terms of RSUs awarded to an employee upon his changes in employment status. As a result, we recorded incremental stock-based compensation expense in relation to the modification of $3.9 million in both the three and nine months ended September 30, 2021. 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 which are subject to revesting on a quarterly basis over a 2 year period. The following table summarizes the activity related to the revest shares during the nine months ended September 30, 2022: Number of Shares Weighted-Average Grant Date Fair Value Per Share (in thousands) Unvested revest shares as of December 31, 2021 336 $ 97.84 Granted — — Modification of shares subject to revest (224) 97.84 Vested (112) 97.84 Cancelled/forfeited — — Unvested revest shares as of September 30, 2022 — $ — For the three months ended September 30, 2022 and 2021, the Company recognized stock-based compensation expense related to revest shares of $7.3 million and $11.0 million, respectively. For the nine months ended September 30, 2022 and 2021, the Company recognized stock-based compensation expense related to revest shares of $27.6 million and $32.9 million, respectively. On January 24, 2022, the Company entered into an agreement with certain holders of restricted stock, who had sold their awards in advance of its 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 condensed 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. 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 three months ended September 30, 2022, the Company did not recognize any stock-based compensation expense associated with the modification of these awards. For the nine months ended September 30, 2022, the Company recognized stock-based compensation expense of $5.6 million associated with the modification of these awards. Performance-Based Restricted Stock Units ("PSUs") Performance stock awards In February 2021, pursuant to the Company’s 2019 Equity Incentive Plan, the Company granted shares of 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 addition, the awards are subject to each recipient’s continuous service through each applicable vest dates. 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 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 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. In addition, the awards are subject to each recipient’s continuous service through each applicable vest dates. 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. For the three and nine months ended September 30, 2022, the Company recognized $0.1 million and $1.1 million of stock-based compensation expense associated with these awards, respectively. For the three and nine months ended September 30, 2021, the Company recognized $(0.5) million and $3.8 million of stock-based compensation expense (benefit), respectively. During the three and nine months ended September 30, 2022, we modified the terms of PSUs awarded to an employee upon their change in employment status. As a result, we recorded incremental stock-based compensation expense in relation to the modification of $0.4 million in both the three and nine months ended September 30, 2022. 2022 Bonus Program On February 11, 2022, the Compensation Committee approved a company-wide bonus program ("2022 Bonus Program"), including performance targets, for the current fiscal year to most of the Company's employees on active payroll in fiscal year 2022. Shares awarded under the program will be in the Company's RSUs ("Payout") and will be based on the final attainment of Company-wide performance targets which are tied to its operating plan for fiscal year 2022. Payout will vary linearly between 50%, 100% and 150% based on the achievement of these targets. In addition, the awards are subject to each recipient’s continuous service through each applicable vest date. In addition, certain employees were granted dollar bonus amounts, which are to be paid out in RSUs. The number of RSUs released will be determined using the average trading price of the Company's stock in the month prior to the Board's final certification of the Company's performance attainment and awards to be issued to each employee. 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 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. During the three and nine months ended September 30, 2022, the Company had recognized $3.9 million and $10.9 million, respectively, of stock-based compensation expense associated with the 2022 Bonus Program. Market-based Performance stock awards ("MPSUs") In September 2022, 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 determined the fair value and derived service period as of the grant date using a Monte Carlo simulation valuation model. For both the three and nine months ended September 30, 2022, the Company recognized $0.4 million of stock-based compensation expense associated with the MPSUs. Employee Share Purchase Program ("ESPP") The ESPP allows eligible employees to purchase shares of the Company's common stock through payroll deductions of up to 15% of their eligible compensation. 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 common stock on the first trading day of the offering period or on the date of purchase. During the three and nine months ended September 30, 2022, the Company withheld $1.2 million and $1.2 million in contributions from employees, respectively, and recognized $0.5 million and $2.3 million in stock-based compensation expense related to the ESPP, respectively. During the three and nine months ended September 30, 2021, the Company withheld $3.5 million and $6.0 million in contributions from employees, respectively, and recognized $0.6 million and $2.7 million in stock-based compensation expense related to the ESPP, respectively. During the three and nine months ended September 30, 2022, 0.3 million shares of the Company's Class A common stock was purchased under the offering period that commenced on May 21, 2022. During the three and nine months ended September 30, 2021, 0.2 million shares of the Company's Class A common stock was purchased under the offering period that commenced on November 21, 2020 and May 20, 2021. Stock-based Compensation Expense The following table summarizes the components of total stock-based compensation expense included in the accompanying Condensed Consolidated Statements of Operations: Three months ended September 30, Nine months ended September 30, 2022 2021 2022 2021 (in thousands) Cost of revenue $ 2,978 $ 1,897 $ 9,112 $ 4,911 Research and development 14,488 14,752 46,966 31,344 Sales and marketing 10,920 9,121 31,198 19,760 General and administrative 10,992 10,866 27,102 44,885 Total stock-based compensation expense $ 39,378 $ 36,636 $ 114,378 $ 100,900 For the three and nine months ended September 30, 2022, the Company capitalized $2.5 million and $6.0 million of stock-based compensation expense, respectively. For the three and nine months ended September 30, 2021, the Company capitalized $2.6 million and $3.4 million of stock-based compensation expense, respectively.

Net Loss Per Share Attributable

Net Loss Per Share Attributable to Common Stockholders	9 Months Ended
	Sep. 30, 2022
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): Three months ended September 30, Nine months ended September 30, 2022 2021 2022 2021 Class A Class A Class B Class A Class A Class B (in thousands, except per share amounts) Net loss attributable to common stockholders $ (63,420) $ (55,109) $ (1,089) $ (144,121) $ (154,623) $ (10,553) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 122,339 114,218 2,257 121,094 107,952 7,368 Net loss per share attributable to common stockholders, basic and diluted $ (0.52) $ (0.48) $ (0.48) $ (1.19) $ (1.43) $ (1.43) 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 (in millions): Number of Shares As of September 30, 2022 2021 (in thousands) Stock options 2,514 5,175 RSUs 12,981 4,458 PSUs 267 109 MPSUs 2,174 — Revest shares — 448 Early exercised stock options — 48 Shares issuable pursuant to the ESPP 194 83 Convertible senior notes (if-converted) 7,338 9,229 Total 25,468 19,550 The dilution table above excludes RSUs to be awarded under the Company's 2022 Bonus Program, which is expected to have an impact on its outstanding awards in the first quarter of 2023. Refer to Note 11 — Stockholders' Equity for further details on the Company's 2022 Bonus Program. Accumulated Other Comprehensive (Loss) Income For the three and nine months ended September 30, 2022 and 2021, components of accumulated other comprehensive (loss) income, net of taxes, were as follows (in thousands): Unrealized Loss on Available-for-Sale Securities Foreign Currency Translation Adjustment Total Balance, June 30, 2022 (11,987) (555) (12,542) Foreign currency translation adjustment — (22) (22) Unrealized loss on available-for-sale securities (114) — (114) Balance, September 30, 2022 (12,101) (577) (12,678) Unrealized Gain on Available-for-Sale Securities Foreign Currency Translation Adjustment Total Balance, June 30, 2021 (120) (141) (261) Foreign currency translation adjustment — (186) (186) Unrealized loss on available-for-sale securities 27 — 27 Balance, September 30, 2021 (93) (327) (420) Unrealized Loss on Available-for-Sale Securities Foreign Currency Translation Adjustment Total Balance, December 31, 2021 (2,242) (385) (2,627) Foreign currency translation adjustment — (192) (192) Unrealized loss on available-for-sale securities (9,859) — (9,859) Balance, September 30, 2022 (12,101) (577) (12,678) Unrealized Gain on Available-for-Sale Securities Foreign Currency Translation Adjustment Total Balance, December 31, 2020 105 (99) 6 Foreign currency translation adjustment — (228) (228) Unrealized loss on available-for-sale securities (198) — (198) Balance, September 30, 2021 (93) (327) (420)

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company's provision for income taxes for interim periods is determined using an estimate of its annual effective tax rate, adjusted for discrete items, if any, that arise during the period. Each quarter, the Company updates its estimate of the annual effective tax rate, and if the estimated annual effective tax rate changes, the Company makes a cumulative adjustment in such period. In the three months ended September 30, 2022 and 2021, the Company recorded income tax expense of $0.1 million and less than $0.1 million, respectively. In the nine months ended September 30, 2022 and 2021, the Company recorded income tax expense of $0.3 million and income tax expense of less than $0.1 million, respectively. The Company continues to maintain a full valuation allowance on the Company's U.S. Federal and state net deferred tax assets. The tax expense for the three and nine months ended September 30, 2022 and 2021 was primarily due to foreign tax expense.

Information About Revenue and G

Information About Revenue and Geographic Areas	9 Months Ended
	Sep. 30, 2022
Segment Reporting [Abstract]
Information About Revenue and Geographic Areas	Information About Revenue and Geographic Areas The Company has determined that it operates under one business unit 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 reporting segment and operating unit structure. 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 region. 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 September 30, As of December 31, 2022 2021 (in thousands) United States $ 178,473 $ 177,990 All other countries 72,438 58,602 Total long-lived assets $ 250,911 $ 236,592

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2022
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The accompanying condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”), consistent in all material respects with those applied in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2021, filed with the Securities and Exchange Commission (“SEC”) on March 1, 2022. The Company's condensed consolidated financial statements include its accounts and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. The Company's condensed consolidated financial statements are unaudited but include all adjustments of a normal recurring nature necessary for a fair presentation of its quarterly results. The Company's condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2021.
Reclassification	Certain changes to presentation have been made to conform the prior period presentation to the current period reporting. Such reclassifications did not affect the condensed consolidated balance sheets, total revenues, operating income, or net income.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates, judgements and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and also on assumptions that it believes are reasonable. Due to the Coronavirus (“COVID-19”) pandemic there has been uncertainty and disruption in the global economy and financial markets. The Company is not aware of any specific event or circumstance that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities as of September 30, 2022. These estimates may change, as new events occur and additional information is obtained, as well as other factors related to COVID-19 that could result in material impacts to the Company's consolidated financial statements in future reporting periods.
Recently Adopted and Issued Accounting Pronouncements	Recently Adopted and Issued Accounting Pronouncements The Company has not adopted any new accounting pronouncements in the three and nine months ended September 30, 2022. Other recently issued accounting pronouncements are not expected to have a material impact on its condensed consolidated financial statements.
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, municipal securities, foreign government and supranational securities and asset-backed securities held at major financial institutions. 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.
Revenue	Revenue by geography is based on the billing address of the customer.
Fair Value of Financial Instruments	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 fair value of the Company's Level 1 financial assets is based on quoted market prices of the identical underlying security. The fair value of the Company's Level 2 financial assets is based on inputs that are directly or indirectly observable in the market, including the readily available pricing sources for the identical underlying security that may not be actively traded.

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Revenue by Geographic Area	The following table presents the Company's net revenue by geographic region: Three months ended September 30, Nine months ended September 30, 2022 2021 2022 2021 (in thousands) United States $ 80,173 $ 62,287 $ 231,838 $ 179,860 Asia Pacific 14,365 9,804 38,954 27,969 Europe 9,536 8,550 28,131 25,969 All other 4,430 6,094 14,481 22,815 Total revenue $ 108,504 $ 86,735 $ 313,404 $ 256,613
Revenue by Customer Type	The following table presents the Company's net revenue for enterprise and non-enterprise customers: Three months ended September 30, Nine months ended September 30, 2022 2021 2022 2021 (in thousands) Enterprise customers $ 97,265 $ 76,006 $ 279,619 $ 226,622 Non-enterprise customers 11,239 10,729 33,785 29,991 Total revenue $ 108,504 $ 86,735 $ 313,404 $ 256,613
Contract Assets and Liabilities	The following table presents the Company's contract assets and contract liabilities as of September 30, 2022 and as of December 31, 2021: As of September 30, 2022 As of December 31, 2021 (in thousands) Contract assets $ 26 $ 89 Contract liabilities $ 25,940 $ 28,907 The Company's payment terms and conditions vary by contract type. Payment terms on invoiced amounts are at a weighted average of 40 days. The following table presents the revenue recognized during the three and nine months ended September 30, 2022 and 2021 from amounts included in the contract liability at the beginning of the period: Three months ended September 30, Nine months ended September 30, 2022 2021 2022 2021 (in thousands) Revenue recognized in the period from amounts included in contract liability at the beginning of the period $ 10,627 $ 8,815 $ 23,231 $ 13,942
Costs to Obtain Contracts	As of September 30, 2022 and December 31, 2021, the Company's costs to obtain contracts were as follows: As of September 30, As of December 31, 2022 2021 (in thousands) Deferred contract costs, net $ 35,524 $ 23,830

Investments and Fair Value Me_2

Investments and Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Schedule of Cash, Cash Equivalents, and Marketable Securities	The Company's total cash, cash equivalents and marketable securities as of September 30, 2022 and December 31, 2021 consisted of the following: As of September 30, As of December 31, 2022 2021 (in thousands) Cash and cash equivalents: Cash $ 42,673 $ 134,774 Money market funds 45,224 31,294 Total cash and cash equivalents (1) $ 87,897 $ 166,068 Marketable securities: U.S. Treasury securities $ 327,868 $ 184,946 Corporate notes and bonds 84,342 11,327 Commercial paper 6,498 124,089 Asset-backed securities 6,464 21,576 Municipal securities — 2,250 Foreign government and supranational securities 19,876 17,607 Total marketable securities, current (2) $ 445,048 $ 361,795 U.S. Treasury securities — 239,528 Corporate notes and bonds 152,773 197,298 Asset-backed securities 31,077 77,142 Municipal securities 2,216 2,312 Foreign government and supranational securities — 12,631 Total marketable securities, non-current (3) $ 186,066 $ 528,911 Total marketable securities $ 631,114 $ 890,706 Total cash, cash equivalents and marketable securities $ 719,011 $ 1,056,774 (1) The Company's cash equivalents include investments with an original maturity date of three months or less. (2) The Company classifies its marketable securities as current, where it intends to hold the securities for less than 12 months. (3) The Company classifies its marketable securities are non-current, where it intends to hold the securities for longer than 12 months.
Schedule of Available-For-Sale Investments	The following table summarizes adjusted cost, gross unrealized gains and losses, and fair value related to available-for-sale securities classified as marketable securities as of September 30, 2022 and December 31, 2021: As of September 30, 2022 Amortized Gross Gross Fair (in thousands) U.S. Treasury securities $ 333,851 $ — $ (5,983) $ 327,868 Corporate notes and bonds 242,536 — (5,421) 237,115 Commercial paper 6,498 — — 6,498 Asset-backed securities 37,938 — (397) 37,541 Municipal securities 2,323 — (107) 2,216 Foreign government and supranational securities 20,070 — (194) 19,876 Total available-for-sale investments $ 643,216 $ — $ (12,102) $ 631,114 As of December 31, 2021 Amortized Gross Gross Fair (in thousands) U.S. Treasury securities $ 425,560 $ 1 $ (1,086) $ 424,475 Corporate notes and bonds 209,550 — (925) 208,625 Commercial paper 124,098 — (9) 124,089 Asset-backed securities 98,857 — (140) 98,717 Municipal securities 4,577 — (15) 4,562 Foreign government and supranational securities 30,306 — (68) 30,238 Total available-for-sale investments $ 892,948 $ 1 $ (2,243) $ 890,706
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 September 30, 2022 Level 1 Level 2 Level 3 Total (in thousands) Cash equivalents: Money market funds $ 45,224 $ — $ — $ 45,224 Total cash equivalents 45,224 — — 45,224 Marketable securities: Corporate notes and bonds — 237,115 — 237,115 Commercial paper — 6,498 — 6,498 U.S. Treasury securities — 327,868 — 327,868 Municipal securities — 2,216 — 2,216 Asset-backed securities — 37,541 — 37,541 Foreign government and supranational securities — 19,876 — 19,876 Total marketable securities — 631,114 — 631,114 Restricted cash: Restricted cash, current 150 — — 150 Total restricted cash 150 — — 150 Total financial assets $ 45,374 $ 631,114 $ — $ 676,488 As of December 31, 2021 Level 1 Level 2 Level 3 Total (in thousands) Cash equivalents: Money market funds $ 31,294 $ — $ — $ 31,294 Total cash equivalents 31,294 — — 31,294 Marketable securities: U.S. Treasury securities — 424,475 — 424,475 Corporate notes and bonds — 208,625 — 208,625 Commercial paper — 124,089 — 124,089 Asset-backed securities — 98,717 — 98,717 Municipal securities — 4,562 — 4,562 Foreign government and supranational securities — 30,238 — 30,238 Total marketable securities — 890,706 — 890,706 Restricted cash: Restricted cash, non-current 893 — — 893 Total restricted cash 893 — — 893 Total financial assets $ 32,187 $ 890,706 $ — $ 922,893

Business Combinations (Tables)

Business Combinations (Tables)	9 Months Ended
	Sep. 30, 2022
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)	9 Months Ended
	Sep. 30, 2022
Balance Sheet Related Disclosures [Abstract]
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following: As of September 30, As of December 31, 2022 2021 (in thousands) Computer and networking equipment $ 215,102 $ 207,575 Leasehold improvements 7,970 4,631 Furniture and fixtures 1,599 1,606 Office equipment 1,214 654 Internal-use software 60,235 40,345 Property and equipment, gross $ 286,120 $ 254,811 Accumulated depreciation and amortization (107,040) (87,850) Property and equipment, net $ 179,080 $ 166,961
Schedule of Other Assets	Other assets consisted of the following: As of September 30, As of December 31, 2022 2021 (in thousands) Deferred contract costs, net $ 35,524 $ 23,830 Advance payment for purchase of property and equipment 30,348 — Other assets 7,386 5,638 Total other assets $ 73,258 $ 29,468
Schedule of Accrued Expenses	Accrued expenses consisted of the following: As of September 30, As of December 31, 2022 2021 (in thousands) Accrued compensation and related benefits $ 28,520 $ 13,543 Accrued colocation and bandwidth costs 9,684 10,205 Sales and use tax liabilities 9,414 8,070 Other accrued liabilities 6,568 4,294 Total accrued expenses $ 54,186 $ 36,112
Schedule of Other Current Liabilities	Other current liabilities consisted of the following: As of September 30, As of December 31, 2022 2021 (in thousands) Deferred revenue, current $ 22,727 $ 26,421 Accrued computer and networking equipment 5,840 18,081 Holdback payable 4,013 — Other current liabilities 842 605 Total other current liabilities $ 33,422 $ 45,107

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2022
Leases [Abstract]
Schedule of Lease Costs & Other Information	The Company's components of lease cost were as follows: Three months ended September 30, Nine months ended September 30, 2022 2021 2022 2021 (in thousands) Operating lease cost: Operating lease cost $ 9,336 $ 7,018 $ 23,578 $ 19,741 Variable lease cost 1,456 1,806 8,723 4,624 Total operating lease costs $ 10,792 $ 8,824 $ 32,301 $ 24,365 Finance lease cost: Amortization of assets under finance lease $ 3,717 $ 4,124 $ 10,901 $ 6,608 Interest 602 524 1,843 1,259 Total finance lease costs $ 4,319 $ 4,648 $ 12,744 $ 7,867 Other information related to leases was as follows: As of September 30, As of As of December 31, 2022 2021 Weighted Average Remaining Lease Term (in years): Operating leases 4.34 4.41 Finance leases 1.95 2.23 Weighted Average Discount Rate: Operating leases 5.28 % 5.20 % Finance leases 4.74 % 4.86 %
Schedule of Operating Lease Maturities	Future minimum lease payments under non-cancellable leases as of September 30, 2022 were as follows: Operating Leases Finance Leases (in thousands) Remainder of 2022 $ 6,099 $ 9,544 2023 23,351 25,640 2024 19,481 14,282 2025 17,463 1,618 2026 16,859 — Thereafter 12,538 — Total future minimum lease payments $ 95,791 $ 51,084 Less: imputed interest (10,673) (2,250) Total liability $ 85,118 $ 48,834
Schedule of Finance Lease Maturity	Future minimum lease payments under non-cancellable leases as of September 30, 2022 were as follows: Operating Leases Finance Leases (in thousands) Remainder of 2022 $ 6,099 $ 9,544 2023 23,351 25,640 2024 19,481 14,282 2025 17,463 1,618 2026 16,859 — Thereafter 12,538 — Total future minimum lease payments $ 95,791 $ 51,084 Less: imputed interest (10,673) (2,250) Total liability $ 85,118 $ 48,834

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in the Carrying Amount of Goodwill	The changes in the carrying amount of goodwill for the nine months ended September 30, 2022 are as follows: Nine months ended September 30, 2022 (in thousands) Balance as of December 31, 2021 $ 636,805 Goodwill acquired from business combinations 33,419 Foreign currency translation and other adjustments (66) Balance as of September 30, 2022 $ 670,158
Schedule of Intangible Assets	As of September 30, 2022 and December 31, 2021, the Company's intangible assets consisted of the following: As of September 30, 2022 As of December 31, 2021 Gross carrying value Accumulated amortization Net carrying value Gross carrying value Accumulated amortization Net carrying value (in thousands) Intangible assets: Customer relationships $ 69,860 $ (17,359) $ 52,501 $ 69,100 $ (10,797) $ 58,303 Developed technology 50,130 (19,853) 30,277 49,500 (12,375) 37,125 Trade names 3,910 (2,251) 1,659 3,300 (1,375) 1,925 Internet protocol addresses 4,984 (1,346) 3,638 4,984 (973) 4,011 Backlog 2,200 (2,200) — 2,200 (1,375) 825 In-process research and development ("IPR&D") 368 — 368 368 — 368 Domain name 39 — 39 39 — 39 Total intangible assets $ 131,491 $ (43,009) $ 88,482 $ 129,491 $ (26,895) $ 102,596
Expected Amortization Expense of Intangible Assets	The expected amortization expense of intangible assets subject to amortization as of September 30, 2022 is as follows: As of September 30, 2022 (in thousands) Remainder of 2022 $ 5,198 2023 20,437 2024 19,603 2025 16,977 2026 9,193 Thereafter 16,706 Total $ 88,114

Debt Instruments (Tables)

Debt Instruments (Tables)	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Carrying Values of Debt Agreements	The following table reflects the carrying values of the debt agreements as of September 30, 2022 and December 31, 2021: As of September 30, 2022 As of December 31, 2021 (in thousands) (in thousands) Convertible Senior notes (effective interest rate of 0.40%) Principal amount $ 713,753 $ 948,750 Less: unamortized debt issuance costs (9,711) (15,545) Less: current portion of long-term debt — — Long-term debt, less current portion $ 704,042 $ 933,205

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
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 its purchase commitments as of September 30, 2022 were as follows: Cost of Revenue Commitments SaaS Agreements Total Purchase Commitments (in thousands) Remainder of 2022 $ 13,873 $ 7,333 $ 21,206 2023 32,962 17,882 50,844 2024 10,151 1,184 11,335 2025 311 277 588 2026 166 — 166 Thereafter 89 — 89 Total $ 57,552 $ 26,676 $ 84,228

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2022
Stockholders' Equity Note [Abstract]
Schedule of Stock Option Activity	The following table summarizes stock option activity during the nine months ended September 30, 2022: Shares Weighted- Weighted- Aggregate (in thousands) (in years) (in thousands) Outstanding at December 31, 2021 4,369 5.07 5.10 $ 132,721 Granted — — Exercised (1,712) 3.11 Cancelled/forfeited (143) 12.14 Outstanding at September 30, 2022 2,514 6.01 5.10 $ 9,912 Vested and exercisable at September 30, 2022 2,328 5.58 5.00 $ 9,805
Schedule of Restricted Stock Units	The following table summarizes RSU activity during the nine months ended September 30, 2022: Number of Shares Weighted-Average (in thousands) Unvested RSUs as of December 31, 2021 5,285 $ 42.80 Granted 11,088 15.00 Vested (1,918) 35.41 Cancelled/forfeited (1,474) 32.54 Unvested RSUs as of September 30, 2022 12,981 $ 21.32 The following table summarizes the activity related to the revest shares during the nine months ended September 30, 2022: Number of Shares Weighted-Average Grant Date Fair Value Per Share (in thousands) Unvested revest shares as of December 31, 2021 336 $ 97.84 Granted — — Modification of shares subject to revest (224) 97.84 Vested (112) 97.84 Cancelled/forfeited — — Unvested revest shares as of September 30, 2022 — $ —
Schedule of Stock-Based Compensation Expense	The following table summarizes the components of total stock-based compensation expense included in the accompanying Condensed Consolidated Statements of Operations: Three months ended September 30, Nine months ended September 30, 2022 2021 2022 2021 (in thousands) Cost of revenue $ 2,978 $ 1,897 $ 9,112 $ 4,911 Research and development 14,488 14,752 46,966 31,344 Sales and marketing 10,920 9,121 31,198 19,760 General and administrative 10,992 10,866 27,102 44,885 Total stock-based compensation expense $ 39,378 $ 36,636 $ 114,378 $ 100,900

Net Loss Per Share Attributab_2

Net Loss Per Share Attributable to Common Stockholders (Tables)	9 Months Ended
	Sep. 30, 2022
Earnings Per Share [Abstract]
Schedule of Earnings 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): Three months ended September 30, Nine months ended September 30, 2022 2021 2022 2021 Class A Class A Class B Class A Class A Class B (in thousands, except per share amounts) Net loss attributable to common stockholders $ (63,420) $ (55,109) $ (1,089) $ (144,121) $ (154,623) $ (10,553) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 122,339 114,218 2,257 121,094 107,952 7,368 Net loss per share attributable to common stockholders, basic and diluted $ (0.52) $ (0.48) $ (0.48) $ (1.19) $ (1.43) $ (1.43)
Schedule of Antidilutive Securities Excluded from Computation of Earnings 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 (in millions): Number of Shares As of September 30, 2022 2021 (in thousands) Stock options 2,514 5,175 RSUs 12,981 4,458 PSUs 267 109 MPSUs 2,174 — Revest shares — 448 Early exercised stock options — 48 Shares issuable pursuant to the ESPP 194 83 Convertible senior notes (if-converted) 7,338 9,229 Total 25,468 19,550
Schedule of Accumulated Other Comprehensive Income (Loss)	For the three and nine months ended September 30, 2022 and 2021, components of accumulated other comprehensive (loss) income, net of taxes, were as follows (in thousands): Unrealized Loss on Available-for-Sale Securities Foreign Currency Translation Adjustment Total Balance, June 30, 2022 (11,987) (555) (12,542) Foreign currency translation adjustment — (22) (22) Unrealized loss on available-for-sale securities (114) — (114) Balance, September 30, 2022 (12,101) (577) (12,678) Unrealized Gain on Available-for-Sale Securities Foreign Currency Translation Adjustment Total Balance, June 30, 2021 (120) (141) (261) Foreign currency translation adjustment — (186) (186) Unrealized loss on available-for-sale securities 27 — 27 Balance, September 30, 2021 (93) (327) (420) Unrealized Loss on Available-for-Sale Securities Foreign Currency Translation Adjustment Total Balance, December 31, 2021 (2,242) (385) (2,627) Foreign currency translation adjustment — (192) (192) Unrealized loss on available-for-sale securities (9,859) — (9,859) Balance, September 30, 2022 (12,101) (577) (12,678) Unrealized Gain on Available-for-Sale Securities Foreign Currency Translation Adjustment Total Balance, December 31, 2020 105 (99) 6 Foreign currency translation adjustment — (228) (228) Unrealized loss on available-for-sale securities (198) — (198) Balance, September 30, 2021 (93) (327) (420)

Information About Revenue and_2

Information About Revenue and Geographic Areas (Tables)	9 Months Ended
	Sep. 30, 2022
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 September 30, As of December 31, 2022 2021 (in thousands) United States $ 178,473 $ 177,990 All other countries 72,438 58,602 Total long-lived assets $ 250,911 $ 236,592

Nature of Business (Details)

Nature of Business (Details)	Sep. 30, 2022 operating_market
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating markets	79

Revenue - Revenue by Geographic

Revenue - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 108,504	$ 86,735	$ 313,404	$ 256,613
United States
Disaggregation of Revenue [Line Items]
Total revenue	80,173	62,287	231,838	179,860
Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenue	14,365	9,804	38,954	27,969
Europe
Disaggregation of Revenue [Line Items]
Total revenue	9,536	8,550	28,131	25,969
All other
Disaggregation of Revenue [Line Items]
Total revenue	$ 4,430	$ 6,094	$ 14,481	$ 22,815

Revenue - Narrative (Details)

Revenue - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Enterprise customer threshold	$ 100,000		$ 100,000
Revenue, performance obligation, description of payment terms			Payment terms on invoiced amounts are at a weighted average of 40 days.
Amortization of deferred contract costs	$ 2,000,000	$ 1,600,000	$ 6,020,000	$ 4,567,000

Revenue - Revenue by Customer T

Revenue - Revenue by Customer Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 108,504	$ 86,735	$ 313,404	$ 256,613
Enterprise customers
Disaggregation of Revenue [Line Items]
Total revenue	97,265	76,006	279,619	226,622
Non-enterprise customers
Disaggregation of Revenue [Line Items]
Total revenue	$ 11,239	$ 10,729	$ 33,785	$ 29,991

Revenue - Contract Assets and L

Revenue - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Contract assets	$ 26		$ 26		$ 89
Contract liabilities	25,940		25,940		$ 28,907
Contract with Customer, Liability
Revenue recognized in the period from amounts included in contract liability at the beginning of the period	$ 10,627	$ 8,815	$ 23,231	$ 13,942

Revenue - Remaining Performance

Revenue - Remaining Performance Obligation (Details) $ in Millions	Sep. 30, 2022 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue performance obligation	$ 173
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	78%
Remaining performance obligation, timing of satisfaction	12 months

Revenue - Costs to Obtain Contr

Revenue - Costs to Obtain Contracts (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Deferred contract costs, net	$ 35,524	$ 23,830

Investments and Fair Value Me_3

Investments and Fair Value Measurements - Cash, Cash Equivalent and Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents:	$ 87,897	$ 166,068	$ 282,131
Marketable securities, current	445,048	361,795
Marketable securities, non-current	186,066	528,911
Total marketable securities	631,114	890,706
Total cash, cash equivalents and marketable securities	719,011	1,056,774
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	327,868	184,946
Marketable securities, non-current	0	239,528
Total marketable securities	327,868	424,475
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	84,342	11,327
Marketable securities, non-current	152,773	197,298
Total marketable securities	237,115	208,625
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	6,498	124,089
Total marketable securities	6,498	124,089
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	6,464	21,576
Marketable securities, non-current	31,077	77,142
Total marketable securities	37,541	98,717
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	0	2,250
Total marketable securities	2,216	4,562
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities, non-current	2,216	2,312
Foreign government and supranational securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	19,876	17,607
Marketable securities, non-current	0	12,631
Total marketable securities	19,876	30,238
Cash
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents:	42,673	134,774
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents:	$ 45,224	$ 31,294

Investments and Fair Value Me_4

Investments and Fair Value Measurements - Available-For-Sale Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 643,216	$ 892,948
Gross Unrealized Gain	0	1
Gross Unrealized Loss	(12,102)	(2,243)
Fair Value	631,114	890,706
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	333,851	425,560
Gross Unrealized Gain	0	1
Gross Unrealized Loss	(5,983)	(1,086)
Fair Value	327,868	424,475
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	242,536	209,550
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(5,421)	(925)
Fair Value	237,115	208,625
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,498	124,098
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	(9)
Fair Value	6,498	124,089
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	37,938	98,857
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(397)	(140)
Fair Value	37,541	98,717
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,323	4,577
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(107)	(15)
Fair Value	2,216	4,562
Foreign government and supranational securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,070	30,306
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(194)	(68)
Fair Value	$ 19,876	$ 30,238

Investments and Fair Value Me_5

Investments and Fair Value Measurements - Narrative (Details) $ in Millions	Sep. 30, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Fair Value Disclosures [Abstract]
Securities in a continuous loss position (in securities) | security	19	0
Restricted cash | $	$ 0.2	$ 0.9

Investments and Fair Value Me_6

Investments and Fair Value Measurements - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 45,224	$ 31,294
Marketable securities	631,114	890,706
Restricted cash	150	893
Total financial assets	676,488	922,893
Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	237,115	208,625
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	6,498	124,089
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	327,868	424,475
Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	2,216	4,562
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	37,541	98,717
Foreign government and supranational securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	19,876	30,238
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	45,224	31,294
Restricted cash	150	893
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	45,224	31,294
Marketable securities	0	0
Restricted cash	150	893
Total financial assets	45,374	32,187
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	0
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 | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	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 | Foreign government and supranational securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 1 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	45,224	31,294
Restricted cash	150	893
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Marketable securities	631,114	890,706
Restricted cash	0	0
Total financial assets	631,114	890,706
Level 2 | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	237,115	208,625
Level 2 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	6,498	124,089
Level 2 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	327,868	424,475
Level 2 | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	2,216	4,562
Level 2 | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	37,541	98,717
Level 2 | Foreign government and supranational securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	19,876	30,238
Level 2 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Restricted cash	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Marketable securities	0	0
Restricted cash	0	0
Total financial assets	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	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 | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	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 | Foreign government and supranational securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 3 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Restricted cash	$ 0	$ 0

Business Combinations - Narrati

Business Combinations - Narrative (Details) - USD ($)		3 Months Ended	9 Months Ended
	May 18, 2022	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Goodwill		$ 670,158,000	$ 670,158,000	$ 636,805,000
Minimum
Business Acquisition [Line Items]
Consideration transferred, holdback, period for distribution	12 months
Maximum
Business Acquisition [Line Items]
Consideration transferred, holdback, period for distribution	24 months
Glitch Inc
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired	100%
Aggregate consideration transferred	$ 34,900,000
Consideration transferred, holdback	8,000,000
Intangible assets	2,000,000
Cash	1,600,000
Other assets, net	600,000
Goodwill	$ 32,600,000
Acquisition related costs		$ 0	$ 2,000,000
Estimated useful life (in years)			3 years 7 months 6 days

Business Combinations - Finite-

Business Combinations - Finite-Lived Intangible Assets (Details) - Glitch Inc - USD ($) $ in Thousands		9 Months Ended
	May 18, 2022	Sep. 30, 2022
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 name
Business Acquisition [Line Items]
Total	$ 610
Estimated useful life (in years)	4 years

Balance Sheet Information - Pro

Balance Sheet Information - Property and equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 286,120	$ 254,811
Accumulated depreciation and amortization	(107,040)	(87,850)
Property and equipment, net	179,080	166,961
Computer and networking equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	215,102	207,575
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,970	4,631
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,599	1,606
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,214	654
Internal-use software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	60,235	40,345
Property and equipment, net	$ 41,800	$ 27,900

Balance Sheet Information - Nar

Balance Sheet Information - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 10,700	$ 7,400			$ 31,200	$ 20,700
Additions to capitalized internal-use software		5,100
Previously expensed capitalized internal-use software			$ 2,700	$ 2,400
Property and equipment, net	179,080				179,080		$ 166,961
Finance lease, right-of-use asset, before accumulated amortization	87,200				87,200		67,800
Finance lease, right-of-use asset, accumulated amortization	24,700				24,700		14,400
Internal-use software
Property, Plant and Equipment [Line Items]
Depreciation and amortization	2,400	$ 1,300			6,000	$ 3,200
Property and equipment, net	$ 41,800				$ 41,800		$ 27,900

Balance Sheet Information - Oth

Balance Sheet Information - Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Deferred contract costs, net	$ 35,524	$ 23,830
Advance payment for purchase of property and equipment	30,348	0
Other assets	7,386	5,638
Total other assets	$ 73,258	$ 29,468

Balance Sheet Information - Acc

Balance Sheet Information - Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Accrued compensation and related benefits	$ 28,520	$ 13,543
Accrued colocation and bandwidth costs	9,684	10,205
Sales and use tax liabilities	9,414	8,070
Other accrued liabilities	6,568	4,294
Accrued expenses	$ 54,186	$ 36,112

Balance Sheet Information - O_2

Balance Sheet Information - Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Deferred revenue, current	$ 22,727	$ 26,421
Accrued computer and networking equipment	5,840	18,081
Holdback payable	4,013	0
Other current liabilities	842	605
Total other current liabilities	$ 33,422	$ 45,107

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Lessee, Lease, Description [Line Items]
Subleases, remaining lease terms (in years)			2 years
Sublease income	$ 0.2	$ 0.2	$ 0.7	$ 0.7
Lease not yet commenced, commitment amount	$ 1.8		$ 1.8
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms, operating (in years)	1 year		1 year
Remaining lease terms, finance (in years)	1 year		1 year
Lease not yet commenced, term of contract	3 years		3 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms, operating (in years)	8 years		8 years
Remaining lease terms, finance (in years)	8 years		8 years

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Leases [Abstract]
Operating lease cost	$ 9,336	$ 7,018	$ 23,578	$ 19,741
Variable lease cost	1,456	1,806	8,723	4,624
Total operating lease costs	10,792	8,824	32,301	24,365
Amortization of assets under finance lease	3,717	4,124	10,901	6,608
Interest	602	524	1,843	1,259
Total finance lease costs	$ 4,319	$ 4,648	$ 12,744	$ 7,867

Leases - Supplemental Lease Inf

Leases - Supplemental Lease Information (Details)	Sep. 30, 2022	Dec. 31, 2021
Weighted Average Remaining Lease Term (in years):
Operating leases	4 years 4 months 2 days	4 years 4 months 28 days
Finance leases	1 year 11 months 12 days	2 years 2 months 23 days
Weighted Average Discount Rate:
Operating leases	5.28%	5.20%
Finance leases	4.74%	4.86%

Leases - Lease Liability Maturi

Leases - Lease Liability Maturity (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Operating Leases
Remainder of 2022	$ 6,099
2023	23,351
2024	19,481
2025	17,463
2026	16,859
Thereafter	12,538
Total future minimum lease payments	95,791
Less: imputed interest	(10,673)
Total liability	85,118
Finance Leases
Remainder of 2022	9,544
2023	25,640
2024	14,282
2025	1,618
2026	0
Thereafter	0
Total future minimum lease payments	51,084
Less: imputed interest	(2,250)
Total liability	$ 48,834

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill [Roll Forward]
Balance as of December 31, 2021	$ 636,805
Goodwill acquired from business combinations	33,419
Foreign currency translation and other adjustments	(66)
Balance as of September 30, 2022	$ 670,158

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ (43,009)	$ (26,895)
Total	88,114
Gross carrying value	131,491	129,491
Total intangible assets	88,482	102,596
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	69,860	69,100
Accumulated amortization	(17,359)	(10,797)
Total	52,501	58,303
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	50,130	49,500
Accumulated amortization	(19,853)	(12,375)
Total	30,277	37,125
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	3,910	3,300
Accumulated amortization	(2,251)	(1,375)
Total	1,659	1,925
Internet protocol addresses
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	4,984	4,984
Accumulated amortization	(1,346)	(973)
Total	3,638	4,011
Backlog
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	2,200	2,200
Accumulated amortization	(2,200)	(1,375)
Total	0	825
In-process research and development ("IPR&D")
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	368	368
Accumulated amortization	0	0
Total	368	368
Domain name
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	39	39
Accumulated amortization	0	0
Total	$ 39	$ 39

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, impairment loss	$ 0	$ 0	$ 0	$ 0
Amortization of intangible assets	5,500,000	$ 5,300,000	16,114,000	15,929,000
Purchase of intangible assets	$ 0		$ 0	$ 2,092,000

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Expected Amortization of Intangible Assets (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2022	$ 5,198
2023	20,437
2024	19,603
2025	16,977
2026	9,193
Thereafter	16,706
Total	$ 88,114

Debt Instruments - Senior Secur

Debt Instruments - Senior Secured Credit Facilities Agreement (Details) - SVB Revolver		3 Months Ended		9 Months Ended
	Feb. 16, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Debt facility, maximum borrowing amount	$ 100,000,000
Transaction costs	$ 600,000
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	$ 0	$ 0
Amount of debt outstanding		$ 0		$ 0		$ 0
Minimum
Debt Instrument [Line Items]
Line of credit, unused capacity, commitment fee percentage	0.20%
Maximum
Debt Instrument [Line Items]
Line of credit, unused capacity, commitment fee percentage	0.25%
LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2%

Debt Instruments - Convertible

Debt Instruments - Convertible Senior Notes (Details) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Mar. 05, 2021 USD ($)	Sep. 30, 2022 USD ($) $ / shares	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) d $ / shares	Sep. 30, 2021 USD ($)	May 25, 2022 USD ($)
Debt Instrument [Line Items]
Issuance of convertible note, net of issuance costs				$ 0	$ 930,775
Net gain on extinguishment of debt		$ 0	$ 0	$ 54,391	$ 0
2026 Convertible Notes
Debt Instrument [Line Items]
Issuance of convertible note, net of issuance costs	$ 930,000
2026 Convertible Notes | Common Stock—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		$ 102.80
2026 Convertible Notes | Fastly Conversion Option
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger				130%
Debt instrument, convertible, threshold trading days | d				20
Debt instrument, convertible, threshold consecutive trading days | d				30
2026 Convertible Notes | Holder Conversion Option One | Common Stock—Class A
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger				130%
Debt instrument, convertible, threshold trading days | d				20
Debt instrument, convertible, threshold consecutive trading days | d				30
2026 Convertible Notes | Holder Conversion Option Two | Common Stock—Class A
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger				98%
Debt instrument, convertible, threshold trading days | d				5
Debt instrument, convertible, threshold consecutive trading days | d				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
Debt instrument, repurchased face amount						$ 235,000
Debt instrument, repurchase amount						$ 176,400
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	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Effective interest rate	0.40%
Principal amount	$ 713,753	$ 948,750
Less: unamortized debt issuance costs	(9,711)	(15,545)
Less: current portion of long-term debt	0	0
Long-term debt, less current portion	$ 704,042	$ 933,205

Debt Instruments - Narrative (D

Debt Instruments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Disclosure [Abstract]
Interest expense	$ 0.8	$ 1	$ 2.7	$ 2.4

Commitments and Contingencies -

Commitments and Contingencies - Purchase Commitments (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Long-term Purchase Commitment [Line Items]
Remainder of 2022	$ 21,206
2023	50,844
2024	11,335
2025	588
2026	166
Thereafter	89
Total	84,228
Cost of Revenue Commitments
Long-term Purchase Commitment [Line Items]
Remainder of 2022	13,873
2023	32,962
2024	10,151
2025	311
2026	166
Thereafter	89
Total	57,552
SaaS Agreements
Long-term Purchase Commitment [Line Items]
Remainder of 2022	7,333
2023	17,882
2024	1,184
2025	277
2026	0
Thereafter	0
Total	$ 26,676

Commitments and Contingencies_2

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Long-term purchase obligations	$ 26.7
Other long term contracts	4.6
Sales and use tax liability	$ 8.5	$ 7.5

Stockholders' Equity - Equity I

Stockholders' Equity - Equity Incentive Plans (Details) shares in Millions	9 Months Ended
	Sep. 30, 2022 plan shares	Dec. 31, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive plans | plan	4
Common Stock—Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares outstanding (in shares)	122.8	118.8
Common stock, shares issued (in shares)	122.8	118.8
2019 Equity Incentive Plan | Common Stock—Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares available for future issuance (in shares)	9.8	15.9

Stockholders' Equity - Stock Op

Stockholders' Equity - Stock Options (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 39,378	$ 36,636	$ 114,378	$ 100,900
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,900	5,300	5,100	13,400
Modification expense	$ 700	2,400	$ 800	3,700
Modification expense, incremental fair value		$ 2,100		$ 3,300
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			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

Stockholders' Equity - Stock _2

Stockholders' Equity - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares
Number of Shares
Options outstanding, beginning balance (in shares) | shares	4,369
Granted (in shares) | shares	0
Exercised (in shares) | shares	(1,712)
Cancelled/forfeited (in shares) | shares	(143)
Options outstanding, ending balance (in shares) | shares	2,514	4,369
Options vested and exercisable (in shares) | shares	2,328
Weighted- Average  Exercise Price
Options outstanding, weighted average exercise price, beginning of period (in USD per share) | $ / shares	$ 6.01	$ 5.07
Granted, weighted average exercise price (in USD per share) | $ / shares	0
Exercised, weighted average exercise price (in USD per share) | $ / shares	3.11
Cancelled/forfeited, weighted average exercise price (in USD per share) | $ / shares	12.14
Options outstanding, weighted average exercise price, end of period (in USD per share) | $ / shares	6.01	$ 5.07
Vested and exercisable, weighted-average exercise price (in USD per share) | $ / shares	$ 5.58
Stock Option Activity, Additional Disclosures
Weighted-average remaining contractual period	5 years 1 month 6 days	5 years 1 month 6 days
Vested and exercisable, weighted average contractual term	5 years
Aggregate intrinsic value | $	$ 9,912	$ 132,721
Vested and exercisable, aggregate intrinsic value | $	$ 9,805

Stockholders' Equity - RSUs and

Stockholders' Equity - RSUs and Revest Shares (Details)		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 cofounder shares	Dec. 31, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 39,378,000	$ 36,636,000	$ 114,378,000	$ 100,900,000
Signal Sciences Corp.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of cofounders with shares subject to revesting | cofounder						3
Shares held back for restricted stock awards, revesting period						2 years
Signal Sciences Corp. | Common Stock—Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares restricted for stock awards (in shares) | shares						896,499
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				4 years
Stock-based compensation expense		27,800,000	23,000,000	$ 72,900,000	52,000,000
Modification expense		1,900,000	3,900,000	$ 1,900,000	3,900,000
RSUs | First Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				4 years
Award vesting percentage				25%
RSUs | Remaining Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				36 months
Revest Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		7,300,000	$ 11,000,000	$ 27,600,000	$ 32,900,000
Nonvested shares sold that remain unvested (in shares) | shares							224,124
Proceeds from nonvested shares sold	$ 10,700,000
Modification expense, incremental fair value		$ 0		$ 5,600,000

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Restricted, Revest, and Performance Shares (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2022 $ / shares shares
RSUs
Number of Shares
Beginning balance (in shares) | shares	5,285
Granted (in shares) | shares	11,088
Vested (in shares) | shares	(1,918)
Cancelled/forfeited (in shares) | shares	(1,474)
Ending balance (in shares) | shares	12,981
Weighted-Average  Grant Date Fair Value Per Share
Beginning balance (in USD per share) | $ / shares	$ 42.80
Granted (in USD per share) | $ / shares	15
Vested (in USD per share) | $ / shares	35.41
Forfeited (in USD per share) | $ / shares	32.54
Ending balance (in USD per share) | $ / shares	$ 21.32
Revest Shares
Number of Shares
Beginning balance (in shares) | shares	336
Granted (in shares) | shares	0
Modification of shares subject to revest (in shares) | shares	(224)
Vested (in shares) | shares	(112)
Cancelled/forfeited (in shares) | shares	0
Ending balance (in shares) | shares	0
Weighted-Average  Grant Date Fair Value Per Share
Beginning balance (in USD per share) | $ / shares	$ 97.84
Granted (in USD per share) | $ / shares	0
Modification of shares subject to revest (in USD per share) | $ / shares	97.84
Vested (in USD per share) | $ / shares	97.84
Forfeited (in USD per share) | $ / shares	0
Ending balance (in USD per share) | $ / shares	$ 0

Stockholders' Equity - Performa

Stockholders' Equity - Performance-Based Restricted Stock Units (PSUs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Feb. 11, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 39,378	$ 36,636	$ 114,378	$ 100,900
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 (benefit)	100	$ (500)	1,100	$ 3,800
Modification expense	400		400
PSUs | 2022 Bonus Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 3,900		$ 10,900

Stockholders' Equity - MPSU (De

Stockholders' Equity - MPSU (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 39,378	$ 36,636	$ 114,378	$ 100,900
MPSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 400		$ 400

Stockholders' Equity - ESPP (De

Stockholders' Equity - ESPP (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contributions withheld for taxes	$ 1,200	$ 3,500	$ 1,200	$ 6,000
Stock-based compensation expense	$ 39,378	$ 36,636	$ 114,378	$ 100,900
Stock repurchased during period (in shares)	0.3	0.2	0.3	0.2
Shares issuable pursuant to the ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum employee contribution as a percentage of salary			15%
Offering period duration			6 months
Purchase price of common stock, percent			85%
Stock-based compensation expense	$ 500	$ 600	$ 2,300	$ 2,700

Stockholders' Equity - Stock-ba

Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 39,378,000	$ 36,636,000	$ 114,378,000	$ 100,900,000
Share-based payment arrangement, amount capitalized	2,500,000	2,600,000	6,034,000	3,411,000
Liability Classified Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	5,600,000	0	21,500,000	0
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2,978,000	1,897,000	9,112,000	4,911,000
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	14,488,000	14,752,000	46,966,000	31,344,000
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	10,920,000	9,121,000	31,198,000	19,760,000
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 10,992,000	$ 10,866,000	$ 27,102,000	$ 44,885,000

Net Loss Per Share Attributab_3

Net Loss Per Share Attributable to Common Stockholders - Computation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Class of Stock [Line Items]
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	122,339	116,475	121,094	115,320
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	122,339	116,475	121,094	115,320
Net loss per share attributable to common stockholders, basic (in US dollar per share)	$ (0.52)	$ (0.48)	$ (1.19)	$ (1.43)
Net loss per share attributable to common stockholders, diluted (in US dollar per share)	$ (0.52)	$ (0.48)	$ (1.19)	$ (1.43)
Common Stock—Class A
Class of Stock [Line Items]
Net loss attributable to common stockholders, basic	$ (63,420)	$ (55,109)	$ (144,121)	$ (154,623)
Net loss attributable to common stockholders, diluted	$ (63,420)	$ (55,109)	$ (144,121)	$ (154,623)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	122,339	114,218	121,094	107,952
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	122,339	114,218	121,094	107,952
Net loss per share attributable to common stockholders, basic (in US dollar per share)	$ (0.52)	$ (0.48)	$ (1.19)	$ (1.43)
Net loss per share attributable to common stockholders, diluted (in US dollar per share)	$ (0.52)	$ (0.48)	$ (1.19)	$ (1.43)
Common Stock—Class B
Class of Stock [Line Items]
Net loss attributable to common stockholders, basic		$ (1,089)		$ (10,553)
Net loss attributable to common stockholders, diluted		$ (1,089)		$ (10,553)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)		2,257		7,368
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)		2,257		7,368
Net loss per share attributable to common stockholders, basic (in US dollar per share)		$ (0.48)		$ (1.43)
Net loss per share attributable to common stockholders, diluted (in US dollar per share)		$ (0.48)		$ (1.43)

Net Loss Per Share Attributab_4

Net Loss Per Share Attributable to Common Stockholders - Antidilutive Securities (Details) - shares shares in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	25,468	19,550
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	2,514	5,175
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	12,981	4,458
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	267	109
MPSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	2,174	0
Revest shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0	448
Early exercised stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0	48
Shares issuable pursuant to the ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	194	83
Convertible senior notes (if-converted)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	7,338	9,229

Net Loss Per Share Attributab_5

Net Loss Per Share Attributable to Common Stockholders - Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 993,738	$ 1,029,090	$ 1,013,953	$ 1,061,865
Foreign currency translation adjustment	(22)	(186)	(192)	(228)
Unrealized loss on available-for-sale securities	(114)	27	(9,859)	(198)
Ending balance	966,979	1,015,579	966,979	1,015,579
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(12,542)	(261)	(2,627)	6
Ending balance	(12,678)	(420)	(12,678)	(420)
Unrealized Loss on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(11,987)	(120)	(2,242)	105
Foreign currency translation adjustment	0	0	0	0
Unrealized loss on available-for-sale securities	(114)	27	(9,859)	(198)
Ending balance	(12,101)	(93)	(12,101)	(93)
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(555)	(141)	(385)	(99)
Foreign currency translation adjustment	(22)	(186)	(192)	(228)
Unrealized loss on available-for-sale securities	0	0	0	0
Ending balance	$ (577)	$ (327)	$ (577)	$ (327)

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Tax Examination [Line Items]
Income tax expense	$ 118	$ 30	$ 317	$ 44
Less than
Income Tax Examination [Line Items]
Income tax expense		$ 100		$ 100

Information About Revenue and_3

Information About Revenue and Geographic Areas (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) segment	Dec. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	1
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 250,911	$ 236,592
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	178,473	177,990
All other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 72,438	$ 58,602