AppLovin (APP) S-1 24 Nov 21 IPO registration Financial data

Cover Page

Cover Page	12 Months Ended
	Dec. 31, 2020
Document Information [Line Items]
Document Type	S-1
Amendment Flag	false
Entity Filer Category	Non-accelerated Filer
Entity Registrant Name	AppLovin Corporation
Entity Central Index Key	0001751008
Entity Small Business	false
Entity Emerging Growth Company	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 1,049,617	$ 317,235	$ 396,247
Accounts receivable, net	412,884	296,964	161,346
Prepaid expenses and other current assets	163,864	48,795	28,628
Total current assets	1,626,365	662,994	586,221
Property and equipment, net	62,910	28,587	7,901
Operating lease right-of-use assets	77,435	84,336	14,895
Goodwill	997,661	249,773	137,121
Intangible assets, net	1,758,796	1,086,332	440,905
Other assets	44,593	42,571	15,442
Total assets	4,567,760	2,154,593	1,202,485
Current liabilities:
Accounts payable	208,539	147,275	70,522
Accrued liabilities	131,877	95,057	37,299
Licensed asset obligation	17,808	18,760	0
Short-term debt	18,310	15,210	12,210
Deferred revenue	84,884	86,886	8,198
Operating lease liabilities	21,278	22,206	2,510
Deferred acquisition costs, current	87,072	212,658	108,136
Total current liabilities	569,768	598,052	238,875
Non-current liabilities:
Long-term debt	1,731,020	1,583,990	1,168,374
Operating lease liabilities, non-current	65,705	71,755	12,745
Other non-current liabilities	152,048	59,032	39,058
Total liabilities	2,518,541	2,312,829	1,459,052
Commitments and contingencies (Note 5)
Redeemable noncontrolling interest	160	309	0
Stockholders' equity (deficit):
Convertible preferred stock, 100,000,000 and 109,090,908 shares authorized, nil and 109,090,908 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	0	399,589	399,589
Common stock	11	7
Additional paid-in capital	3,084,928	453,655	235,190
Accumulated other comprehensive income (loss)	(27,560)	604	(4,140)
Accumulated deficit	(1,008,320)	(1,012,400)	(887,213)
Total stockholders' equity (deficit)	2,049,059	(158,545)	(256,567)
Total liabilities, redeemable noncontrolling interest, and stockholders' equity (deficit)	$ 4,567,760	2,154,593	1,202,485
Common Class A [Member]
Stockholders' equity (deficit):
Common stock		6	6
Common Class F [Member]
Stockholders' equity (deficit):
Common stock		$ 1	$ 1

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Common stock par or stated value per share	$ 0.00003	$ 0.00003
Common stock shares authorized	1,700,000,000	429,600,000
Common stock shares issued	373,641,135	226,364,401
Common stock shares outstanding	373,641,135	226,364,401
Convertible Preferred Stock [Member]
Preferred stock shares authorized	100,000,000	109,090,908	109,090,908
Preferred stock shares issued	0	109,090,908	109,090,908
Preferred stock shares outstanding	0	109,090,908	109,090,908
Common Class A [Member]
Common stock par or stated value per share		$ 0.00003	$ 0.00003
Common stock shares authorized	1,500,000,000	386,400,000	360,000,000
Common stock shares issued	225,833,513	183,800,251	177,593,772
Common stock shares outstanding	225,833,513	183,800,251	177,593,772
Common Class B [Member]
Common stock shares authorized	200,000,000	0
Common stock shares issued	147,807,622	0
Common stock shares outstanding	147,807,622	0
Common Class F [Member]
Common stock par or stated value per share		$ 0.00003	$ 0.00003
Common stock shares authorized	0	43,200,000	43,200,000
Common stock shares issued	0	42,564,150	42,564,150
Common stock shares outstanding	0	42,564,150	42,564,150

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenue	$ 726,951	$ 381,740	$ 1,999,634	$ 941,249	$ 1,451,086	$ 994,104	$ 483,363
Costs and expenses:
Cost of revenue	254,052	163,060	722,966	357,564	555,578	241,274	53,758
Sales and marketing	285,224	153,014	816,200	417,000	627,796	481,781	166,799
Research and development	108,523	51,136	246,861	99,950	180,652	44,966	16,270
General and administrative	34,104	15,276	122,116	41,256	66,431	31,712	14,854
Lease modification and abandonment of leasehold improvements	0	0	0	7,851	7,851	0
Extinguishments of acquisition-related contingent consideration	0	74,712	0	74,712	74,820	0	(10,763)
Total costs and expenses	681,903	457,198	1,908,143	998,333	1,513,128	799,733	240,918
Income (loss) from operations	45,048	(75,458)	91,491	(57,084)	(62,042)	194,371	242,445
Other income (expense):
Interest expense and loss on settlement of debt	(18,756)	(20,110)	(72,796)	(57,548)	(77,873)	(73,955)	(484,805)
Other income (expense), net	(9,217)	1,169	(997)	5,347	4,209	5,818	2,101
Total other income (expense)	(27,973)	(18,941)	(73,793)	(52,201)	(73,664)	(68,137)	(482,704)
Income (loss) before income taxes	17,075	(94,399)	17,698	(109,285)	(135,706)	126,234	(240,259)
Provision for (benefit from) income taxes	16,933	(4,485)	13,767	(2,324)	(9,772)	7,194	19,736
Net income (loss)	142	(89,914)	3,931	(106,961)	(125,934)	119,040	(259,995)
Add: Net loss attributable to noncontrolling interest	36	226	149	546	(747)	0
Net income (loss) attributable to AppLovin	178	(89,688)	4,080	(106,415)	(125,187)	119,040	(259,995)
Less: Net income attributable to participating securities	(1)	0	(568)	0	0	(42,664)
Net income (loss) attributable to common stock—Basic	177	(89,688)	3,512	(106,415)	(125,187)	76,376	(259,995)
Net income (loss) attributable to common stock—Diluted	$ 177	$ (89,688)	$ 3,539	$ (106,415)	$ (125,187)	$ 76,561	$ (259,995)
Net income (loss) per share attributable to common stockholders:
Basic	$ 0	$ (0.42)	$ 0.01	$ (0.50)	$ (0.58)	$ 0.36	$ (1.37)
Diluted	$ 0	$ (0.42)	$ 0.01	$ (0.50)	$ (0.58)	$ 0.36	$ (1.37)
Weighted average common shares used to compute net income (loss) per share attributable to common stockholders:
Basic	368,427,532	214,638,272	309,353,304	212,998,263	214,936,545	210,937,147	189,533,630
Diluted	384,324,785	214,638,272	327,426,792	212,998,263	214,936,545	212,365,429	189,533,630

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income (loss)	$ 142	$ (89,914)	$ 3,931	$ (106,961)	$ (125,934)	$ 119,040	$ (259,995)
Net income (loss) attributable to common stockholders	178	(89,688)	4,080	(106,415)	(125,187)	119,040	(259,995)
Other comprehensive income (loss), net of tax:
Foreign currency translation gain (loss), net of tax effect of $5.4 million and $8.0 million for the three and nine months ended September 30, 2021	(18,255)	218	(28,164)	278	579	(11)	30
Interest rate swap gain, net of tax effect of $1.5 million and $2.5 million for the three and nine months ended September 30, 2020	0	4,338	0	4,926	4,165	(1,511)	(2,651)
Total other comprehensive income (loss)	(18,255)	4,556	(28,164)	5,204	4,744	(1,522)	(2,621)
Add: Net loss attributable to noncontrolling interest	36	226	149	546
Total comprehensive loss attributable to AppLovin	$ (18,077)	$ (85,132)	$ (24,084)	$ (101,211)	$ (120,443)	$ 117,518	$ (262,616)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Foreign currency translation gain (loss) tax component	$ 5.4		$ 8
Interest rate swap gain tax component		$ 1.5		$ 2.5	$ 1.7	$ 0.4	$ 0.7

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Redeemable Noncontrolling Interest and Stockholders' Equity (Deficit) - USD ($)	Total	Redeemable Non Controlling Equity [Member]	Common Class A [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]Common Class A [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]	Common Stock [Member]	Common Stock [Member]Common Class A [Member]	Common Stock [Member]Common Class F [Member]	Preferred Stock [Member]Convertible Preferred Stock [Member]	Preferred Stock [Member]Series A Convertible Preferred Stock [Member]
Beginning balance at Dec. 31, 2017	$ (580,860,000)			$ 165,390,000		$ 3,000	$ (746,258,000)		$ 4,000	$ 1,000
Beginning balance (Shares) at Dec. 31, 2017									131,361,300	42,564,150
Issuance of common stock warrants and options in connection with an acquisition	735,000			735,000
Issuance of common stock warrants and options in connection with an acquisition (Shares)									4,754,130
Issuance of Series A preferred stock, net of issuance costs	399,589,000											$ 399,589,000
Issuance of Series A preferred stock, net of issuance costs (Shares)												109,090,908
Repurchase of unvested Class A common stock related to early exercised stock options	(21,000)			(21,000)
Repurchase of unvested Class A common stock related to early exercised stock options (Shares)									(19,689)
Exercises of Class A common stock options	979,000			979,000
Exercises of Class A common stock options (Shares)									24,750
Modification of Class A common stock warrant related to settlement of debt	58,374,000			58,374,000
Repurchase of unvested restricted stock awards									(238,554)
Total other comprehensive loss, net	(2,621,000)					(2,621,000)
Stock-based compensation	5,465,000			5,465,000
Net income (loss)	(259,995,000)						(259,995,000)
Ending balance at Dec. 31, 2018	(378,355,000)			230,922,000		(2,618,000)	(1,006,253,000)		$ 4,000	$ 1,000		$ 399,589,000
Ending balance (Shares) at Dec. 31, 2018									135,881,937	42,564,150		109,090,908
Issuance of common stock warrants and options in connection with an acquisition	192,000			192,000
Issuance of common stock warrants and options in connection with an acquisition (Shares)									3,267,792
Exercises and vesting of early exercised Class A common stock options	2,940,000			2,939,000					$ 1,000
Exercises and vesting of early exercised Class A common stock options (Shares)									6,771,873
Repurchase of unvested Class A common stock related to early exercised stock options	(11,000)			(11,000)
Repurchase of unvested Class A common stock related to early exercised stock options (Shares)									(8,595)
Repurchase of Class A common stock	(9,074,000)			(9,074,000)
Repurchase of Class A common stock (Shares)									(2,775,000)
Repurchase of unvested restricted stock awards									(360,552)
Exercise of warrant	1,000								$ 1,000
Exercise of warrant (Shares)									34,816,317
Total other comprehensive loss, net	(1,522,000)					(1,522,000)
Stock-based compensation	10,222,000			10,222,000
Net income (loss)	119,040,000						119,040,000
Net loss - Temporary Equity	0
Ending balance, Temporary Equity at Dec. 31, 2019	0
Ending balance at Dec. 31, 2019	(256,567,000)			235,190,000		(4,140,000)	(887,213,000)	$ 7,000	$ 6,000	$ 1,000	$ 399,589,000	$ 399,589,000
Ending balance (Shares) at Dec. 31, 2019								220,157,922	177,593,772	42,564,150	109,090,908	109,090,908
Exercises and vesting of early exercised Class A common stock options	145,000			145,000
Exercises and vesting of early exercised Class A common stock options (Shares)								442,503
Repurchase of unvested Class A common stock related to early exercised stock options (Shares)								(425,001)
Repurchase of Class A common stock	(760,000)			(760,000)
Repurchase of Class A common stock (Shares)								(114,000)
Total other comprehensive loss, net	(1,903,000)					(1,903,000)
Stock-based compensation	3,462,000			3,462,000
Net income (loss)	4,664,000						4,664,000
Ending balance at Mar. 31, 2020	(250,959,000)			238,037,000		(6,043,000)	(882,549,000)	$ 7,000			$ 399,589,000
Ending balance (Shares) at Mar. 31, 2020								220,061,424			109,090,908
Beginning balance, Temporary Equity at Dec. 31, 2019	0
Beginning balance at Dec. 31, 2019	(256,567,000)			235,190,000		(4,140,000)	(887,213,000)	$ 7,000	$ 6,000	$ 1,000	$ 399,589,000	$ 399,589,000
Beginning balance (Shares) at Dec. 31, 2019								220,157,922	177,593,772	42,564,150	109,090,908	109,090,908
Net income (loss)	(106,415,000)
Net loss - Temporary Equity	(546,000)
Ending balance, Temporary Equity at Sep. 30, 2020		$ 2,010,000
Ending balance at Sep. 30, 2020	(194,059,000)			398,909,000		1,064,000	(993,628,000)	$ 7,000			$ 399,589,000
Ending balance (Shares) at Sep. 30, 2020								224,931,718			109,090,908
Beginning balance, Temporary Equity at Dec. 31, 2019	0
Beginning balance at Dec. 31, 2019	(256,567,000)			235,190,000		(4,140,000)	(887,213,000)	$ 7,000	$ 6,000	$ 1,000	$ 399,589,000	$ 399,589,000
Beginning balance (Shares) at Dec. 31, 2019								220,157,922	177,593,772	42,564,150	109,090,908	109,090,908
Issuance of common stock warrants and options in connection with an acquisition	39,040,000		$ 106,133,000	39,040,000	$ 106,133,000
Issuance of common stock warrants and options in connection with an acquisition (Shares)									2,479,996
Exercises and vesting of early exercised Class A common stock options	2,303,000			2,303,000
Exercises and vesting of early exercised Class A common stock options (Shares)									3,559,168
Issuance of Series A preferred stock, net of issuance costs	9,318,000			9,318,000
Issuance of Series A preferred stock, net of issuance costs (Shares)									764,472
Repurchase of unvested Class A common stock related to early exercised stock options (Shares)									(425,001)
Repurchase of Class A common stock	(1,766,000)			(1,766,000)
Repurchase of Class A common stock (Shares)									(249,000)
Issuance of common stock warrants in connection with lease modification	433,000			433,000
Acquisition of noncontrolling interest		2,556,000
Issuance of Class A common stock in exchange for noncontrolling equity interest	1,500,000	(1,500,000)		1,500,000
Issuance of Class A common stock in exchange for noncontrolling equity interest (Shares)									76,844
Total other comprehensive loss, net	4,744,000					4,744,000
Stock-based compensation	61,504,000			61,504,000
Net income (loss)	(125,187,000)						(125,187,000)
Net loss - Temporary Equity	747,000	(747,000)
Ending balance, Temporary Equity at Dec. 31, 2020	309,000	309,000
Ending balance at Dec. 31, 2020	(158,545,000)			453,655,000		604,000	(1,012,400,000)	$ 7,000	$ 6,000	$ 1,000	$ 399,589,000	$ 399,589,000
Ending balance (Shares) at Dec. 31, 2020								226,364,401	183,800,251	42,564,150	109,090,908	109,090,908
Beginning balance at Mar. 31, 2020	(250,959,000)			238,037,000		(6,043,000)	(882,549,000)	$ 7,000			$ 399,589,000
Beginning balance (Shares) at Mar. 31, 2020								220,061,424			109,090,908
Issuance of common stock warrants and options in connection with an acquisition	39,040,000			39,040,000
Exercises and vesting of early exercised Class A common stock options	117,000			117,000
Exercises and vesting of early exercised Class A common stock options (Shares)								37,593
Repurchase of Class A common stock	(1,006,000)			(1,006,000)
Repurchase of Class A common stock (Shares)								(135,000)
Issuance of common stock warrants in connection with lease modification	433,000			433,000
Acquisition of noncontrolling interest		2,556,000
Total other comprehensive loss, net	2,551,000					2,551,000
Stock-based compensation	4,747,000			4,747,000
Net income (loss)	(21,391,000)						(21,391,000)
Net loss - Temporary Equity		(320,000)
Ending balance, Temporary Equity at Jun. 30, 2020		2,236,000
Ending balance at Jun. 30, 2020	(226,468,000)			281,368,000		(3,492,000)	(903,940,000)	$ 7,000			$ 399,589,000
Ending balance (Shares) at Jun. 30, 2020								219,964,017			109,090,908
Issuance of common stock warrants and options in connection with an acquisition	106,133,000			106,133,000
Issuance of common stock warrants and options in connection with an acquisition (Shares)								2,479,996
Exercises and vesting of early exercised Class A common stock options	840,000			840,000
Exercises and vesting of early exercised Class A common stock options (Shares)								2,487,705
Total other comprehensive loss, net	4,556,000					4,556,000
Stock-based compensation	10,568,000			10,568,000
Net income (loss)	(89,688,000)						(89,688,000)
Net loss - Temporary Equity	(226,000)	(226,000)
Ending balance, Temporary Equity at Sep. 30, 2020		2,010,000
Ending balance at Sep. 30, 2020	(194,059,000)			398,909,000		1,064,000	(993,628,000)	$ 7,000			$ 399,589,000
Ending balance (Shares) at Sep. 30, 2020								224,931,718			109,090,908
Beginning balance, Temporary Equity at Dec. 31, 2020	309,000	309,000
Beginning balance at Dec. 31, 2020	(158,545,000)			453,655,000		604,000	(1,012,400,000)	$ 7,000	$ 6,000	$ 1,000	$ 399,589,000	$ 399,589,000
Beginning balance (Shares) at Dec. 31, 2020								226,364,401	183,800,251	42,564,150	109,090,908	109,090,908
Exercises and vesting of early exercised Class A common stock options	10,143,000			10,143,000
Exercises and vesting of early exercised Class A common stock options (Shares)								1,232,156
Repurchase of Class A common stock								$ (214,509,000)
Total other comprehensive loss, net	(721,000)					(721,000)
Stock-based compensation	29,667,000			29,667,000
Net income (loss)	(10,521,000)						(10,521,000)
Net loss - Temporary Equity		(54,000)
Ending balance, Temporary Equity at Mar. 31, 2021		255,000
Ending balance at Mar. 31, 2021	(129,977,000)			493,465,000		(117,000)	(1,022,921,000)	$ 7,000			$ 399,589,000
Ending balance (Shares) at Mar. 31, 2021								227,382,048			109,090,908
Beginning balance, Temporary Equity at Dec. 31, 2020	309,000	309,000
Beginning balance at Dec. 31, 2020	(158,545,000)			453,655,000		604,000	(1,012,400,000)	$ 7,000	$ 6,000	$ 1,000	$ 399,589,000	$ 399,589,000
Beginning balance (Shares) at Dec. 31, 2020								226,364,401	183,800,251	42,564,150	109,090,908	109,090,908
Net income (loss)	4,080,000
Net loss - Temporary Equity	(149,000)
Ending balance, Temporary Equity at Sep. 30, 2021	160,000	160,000
Ending balance at Sep. 30, 2021	2,049,059,000			3,084,928,000		(27,560,000)	(1,008,320,000)	$ 11,000
Ending balance (Shares) at Sep. 30, 2021								373,641,135
Beginning balance, Temporary Equity at Mar. 31, 2021		255,000
Beginning balance at Mar. 31, 2021	(129,977,000)			493,465,000		(117,000)	(1,022,921,000)	$ 7,000			$ 399,589,000
Beginning balance (Shares) at Mar. 31, 2021								227,382,048			109,090,908
Issuance of common stock warrants and options in connection with an acquisition	342,170,000			342,170,000
Issuance of common stock warrants and options in connection with an acquisition (Shares)								6,320,688
Exercises and vesting of early exercised Class A common stock options	5,190,000			5,190,000
Exercises and vesting of early exercised Class A common stock options (Shares)								1,020,588
Issuance of Series A preferred stock, net of issuance costs (Shares)								12,006
Issuance of Class A common stock in connection with initial public offering, net of issuance costs as adjusted for cost reimbursement	$ 1,747,971,000			1,747,970,000				$ 1,000
Issuance of Class A common stock in connection with initial public offering, net of issuance costs as adjusted for cost reimbursement (Shares)								22,500,000
Conversion of preferred stock to common stock in connection with initial public offering				399,586,000				$ 3,000			$ (399,589,000)
Conversion of preferred stock to common stock in connection with initial public offering (Shares)	109,090,908										(109,090,908)
Repurchase of Class A common stock (Shares)								(390,000)
Exercise of warrant (Shares)								6,229,081
Total other comprehensive loss, net	$ (9,188,000)					(9,188,000)
Stock-based compensation	26,852,000			26,852,000
Net income (loss)	14,423,000						14,423,000
Net loss - Temporary Equity		(59,000)
Ending balance, Temporary Equity at Jun. 30, 2021		196,000
Ending balance at Jun. 30, 2021	1,997,441,000			3,015,233,000		(9,305,000)	(1,008,498,000)	$ 11,000
Ending balance (Shares) at Jun. 30, 2021								372,165,319
Issuance of common stock warrants and options in connection with an acquisition	$ 25,000,000			25,000,000
Issuance of common stock warrants and options in connection with an acquisition (Shares)	405,205							405,205
Exercises and vesting of early exercised Class A common stock options	$ 7,782,000			7,782,000
Exercises and vesting of early exercised Class A common stock options (Shares)								991,787
Issuance of Series A preferred stock, net of issuance costs	2,503,000			2,503,000
Issuance of Series A preferred stock, net of issuance costs (Shares)								78,824
Total other comprehensive loss, net	(18,255,000)					(18,255,000)
Stock-based compensation	34,410,000			34,410,000
Net income (loss)	178,000						178,000
Net loss - Temporary Equity	(36,000)	(36,000)
Ending balance, Temporary Equity at Sep. 30, 2021	160,000	$ 160,000
Ending balance at Sep. 30, 2021	$ 2,049,059,000			$ 3,084,928,000		$ (27,560,000)	$ (1,008,320,000)	$ 11,000
Ending balance (Shares) at Sep. 30, 2021								373,641,135

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities
Net income (loss)	$ 3,931	$ (106,961)	$ (125,934)	$ 119,040	$ (259,995)
Adjustments to reconcile net income (loss) to operating activities:
Amortization, depreciation and write-offs	315,409	157,223	254,951	92,806	16,061
Amortization of debt issuance costs and discount	8,980	5,753	8,152	4,979	428,211
Stock-based compensation	91,828	19,362	62,387	10,222	5,465
Change in operating right-of-use asset	18,199	4,375	9,333	2,602	0
Lease modification and abandonment of leasehold improvements	0	7,851	7,851	0
(Gain) loss on extinguishments of acquisition related contingent consideration			74,820		(10,763)
Loss on extinguishments of acquisition related contingent consideration	0	74,712
Change in fair value of contingent consideration	(230)	0	442	0
Loss on settlement of debt	16,852	0
Gain on embedded derivative			(5,680)	0
Change in the fair value remeasurement of convertible security			1,500	0
Net unrealized gains on fair value remeasurement of financial instruments	(9,305)	(4,400)
Net (gain) loss on foreign currency remeasurement	(4,080)	1,304	2,097	14
Changes in operating assets and liabilities:
Accounts receivable	(99,999)	(27,062)	(113,234)	(33,524)	(30,191)
Prepaid expenses and other current assets	(107,461)	(32,515)	(13,289)	(19,867)	11,087
Other assets	7,729	2,572	(19,092)	(1,485)	(907)
Accounts payable	49,345	(4,205)	49,120	13,534	(21,071)
Operating lease liabilities	(18,270)	(3,674)	(8,812)	(2,242)
Accrued and other liabilities	11,211	(2,389)	2,783	5,661	1,133
Deferred revenue	(7,303)	30,780	35,488	6,722
Net cash provided by operating activities	276,836	122,726	222,883	198,462	139,030
Investing Activities
Purchase of property and equipment	(962)	(2,842)	(3,241)	(3,358)	(1,399)
Acquisitions, net of cash acquired	(1,198,789)	(559,080)	(674,650)	(404,196)	(65,943)
Purchase of non-marketable investments and other	(15,000)	(1,500)
Purchase of Nonmarketable Securities			(2,000)	(4,000)	0
Refund of lease deposits					173
Proceeds from other investing activities	11,358	0
Capitalized software development costs	(2,859)	0
Net cash used in investing activities	(1,206,252)	(563,422)	(679,891)	(411,554)	(67,169)
Financing Activities
Proceeds from issuance of common stock in initial public offering, net of issuance costs as adjusted for cost reimbursement	1,745,228	0
Proceeds from debt issuance, net of issuance costs	844,729	331,346	481,273	388,859	791,062
Payments of debt principal	(711,482)	(60,493)	(64,295)	(11,208)	(1,183,000)
Payments of finance leases	(9,690)	(7,342)	(9,708)	(5,663)	(5,930)
Payments Of Revolver Fess					(1,041)
Proceeds from issuance of preferred stock, net of issuance costs					399,589
Proceeds From Early Exercise Of Stock Awards					909
Proceeds from exercise of stock options	25,486	1,104	2,303	2,637	70
Proceeds from issuance of common stock			9,318
Payments of deferred acquisition costs	(231,664)	(14,442)	(17,586)	(41,454)	0
Payments of Licensed Asset Obligation			(18,940)
Repurchases of common stock	0	(1,766)	(1,766)	(11)	(21)
Payments of deferred IPO costs	0	(220)	(2,744)	0
Net cash provided by financing activities	1,662,607	248,187	377,855	333,160	1,638
Effect of foreign exchange rate on cash and cash equivalents	(809)	65	141	60	39
Net increase (decrease) in cash and cash equivalents	732,382	(192,444)	(79,012)	120,128	73,538
Cash and cash equivalents at beginning of the period	317,235	396,247	396,247	276,119	202,581
Cash and cash equivalents at end of the period	1,049,617	203,803	317,235	396,247	276,119
Supplemental non-cash investing and financing activities disclosures:
Issuance of convertible security related to acquisitions	342,170	0	45,000	0
Acquisitions not yet paid	74,347	16,073
Settlement of convertible security through issuance of common stock	25,000	0
Settlement of contingent consideration through issuance of common stock	0	31,422	31,422	0
Assets acquired under finance leases	12,584	5,459	7,475	3,061	3,917
Right of use assets acquired under operating leases	3,508	6,937
Settlement of bonus compensation through issuance of common stock	2,503	0
Acquisitions of business through issuance of common stock and common stock warrants	0	38,167	38,167	192
Common stock issued in exchange for redeemable noncontrolling interest			1,500	0
Deferred IPO costs not yet paid	0	530	888	0
Accretion of Interest on Related Party Promissory Notes			553	48
Common stock warrant issued in connection with lease modification			433	0
Repurchases of common stock from related parties financed by promissory notes				9,074
Interest expense offset by non-cash financing activities			0	3,549
Supplemental disclosure of cash flow information:
Cash paid for income taxes	72,182	12,362	12,666	30,474	15,311
Cash paid for interest on debt	$ 47,021	$ 44,687	$ 59,360	$ 62,278	$ 44,628

Description of Business and Pri

Description of Business and Principles of Consolidation	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Principles of Consolidation	1. Description of Business and Principles of Consolidation Description of Business AppLovin Corporation (the “Company” or “AppLovin”) was incorporated in the state of Delaware on July 18, 2011. The Company is a leader in the mobile app industry with a focus on building a software-based platform for mobile app developers to improve the marketing and monetization of their apps. The Company also has a globally diversified portfolio of apps—free-to-play mobile The Company’s operations are headquartered in Palo Alto, California, and has several operating locations in the U.S. as well as various international office locations in North America, Asia and Europe. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial reporting. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, the unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in the Company’s final prospectus related to its initial public offering (“IPO”) dated April 14, 2021 and filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933, as amended. The condensed consolidated balance sheet data as of December 31, 2020 was derived from the audited consolidated financial statements at that date but does not include all disclosures required by GAAP. The accompanying unaudited condensed consolidated financial statements reflect all adjustments, consisting only of normal recurring adjustments, that are, in the opinion of management, necessary for the fair presentation of the Company’s financial position, results of operations, cash flows and stockholders’ equity for the interim periods presented. The results of operations for the three and nine months ended September 30, 2021 shown in this report are not necessarily indicative of the results to be expected for the full year ending December 31, 2021 or any other period. Principles of Consolidation The unaudited condensed consolidated financial statements reflect the accounts of AppLovin Corporation and its subsidiaries in which the Company has a controlling financial interest. In accordance with the provisions of Accounting Standards Codification (“ASC”) 810, Consolidation, the Company consolidates any variable interest entity (“VIE”) of which the Company is the primary beneficiary. The Company engages in business relationships with certain entities in the ordinary course of business to develop game Apps. The typical condition for a controlling financial interest ownership is holding a majority of the voting interests of an entity; however, a controlling financial interest may also exist in entities, such as VIEs, through arrangements that do not involve controlling voting interests. ASC 810 requires a variable interest holder to consolidate a VIE if that party has the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and the obligation to absorb losses of the VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. The Company does not consolidate a VIE in which it has a majority ownership interest when the Company is not considered the primary beneficiary. The Company evaluates its relationships with all VIEs on an ongoing basis. All intercompany transactions and balances have been eliminated upon consolidation. Initial Public Offering and Capital Structure Change The Company’s registration statement on Form S-1 (the Following the effectiveness of the IPO Registration Statement, the Company filed its Amended and Restated Certificate of Incorporation, which became effective immediately prior to the closing of the IPO (the “IPO Certificate”). The IPO Certificate authorizes a total of 1,500,000,000 shares of Class A common stock, 200,000,000 shares of Class B common stock, 150,000,000 shares of Class C common stock, and 100,000,000 shares of preferred stock. Upon the filing and effectiveness of the IPO Certificate, all shares of Class F common stock and Series A convertible preferred stock then outstanding automatically converted into the equivalent number of shares of Class A common stock, respectively (the “Capital Stock Conversions”). Following the Capital Stock Conversions and immediately prior to the completion of the IPO, a total of 150,307,622 shares of Class A common stock held by Adam Foroughi, the Company’s co-founder, CEO, and The rights of the holders of all classes of stock pursuant to the IPO Certificate are as follows: Common Stock The rights of the holders of Class A common stock, Class B common stock, and Class C common stock (referred to together as the “common stock”) are identical, except with respect to voting and conversion. Voting Rights Holders of the Class A common stock are entitled to one vote for each share held on all matters submitted to a vote of stockholders, holders of the Class B common stock are entitled to 20 votes for each share held on all matters submitted to a vote of stockholders, and holders of the Class C common stock are not entitled to vote on any matter that is submitted to a vote of stockholders, except as otherwise required by law. The holders of the Class A common stock and Class B common stock will vote together as a single class, unless otherwise required by law. Under the IPO Certificate, approval of the holders of at least a majority of the outstanding shares of the Class B common stock voting as a separate class will be required to increase the number of authorized shares of the Class B common stock. In addition, Delaware law could require either holders of the Class A common stock, the Class B common stock, or the Class C common stock to vote separately as a single class in the following circumstances: • if the Company were to seek to amend the IPO Certificate to increase or decrease the par value of a class of stock, then that class would be required to vote separately to approve the proposed amendment; and • if the Company were to seek to amend the IPO Certificate in a manner that alters or changes the powers, preferences or special rights of a class of stock in a manner that affected its holders adversely, then that class would be required to vote separately to approve the proposed amendment. Until the date on which the final conversion of all outstanding shares of Class B common stock pursuant to the terms of the IPO Certificate occurs, approval of at least two-thirds of Upon the closing of the IPO, the Class B Stockholders held all of the issued and outstanding shares of the Company’s Class B common stock. The Class B Stockholders have entered into a voting agreement (the “Voting Agreement”) whereby all Class B common stock held by the Class B Stockholders and their respective permitted entities and permitted transferees will be voted as determined by two of Mr. Foroughi, Mr. Chen, and KKR Denali (one of which must be Mr. Foroughi). Dividend Rights Subject to preferences that may apply to any shares of preferred stock outstanding at the time, the holders of the Company’s common stock will be entitled to receive dividends out of funds legally available if the Company’s board of directors, in its discretion, determines to issue dividends and then only at the times and in the amounts that the Company’s board of directors may determine. No Preemptive or Similar Rights The Company’s common stock will not be entitled to preemptive rights, and is not subject to conversion, redemption or sinking fund provisions. Right to Receive Liquidation Distributions If the Company becomes subject to a liquidation, dissolution or winding-up, the Conversion of Class B Common Stock Each share of Class B common stock will be convertible at any time at the option of the holder into one share of Class A common stock. Following the closing of the IPO, shares of Class B common stock will automatically convert into shares of Class A common stock upon sale or transfer except for certain transfers described in the IPO Certificate, including transfers for estate planning, transfers among KKR Denali and its affiliates, or other transfers among the Class B Stockholders. Withdrawal from the Voting Agreement constitutes a transfer. Each share of Class B common stock will convert automatically into one share of Class A common stock upon the date fixed by the Company’s board of directors that is no less than 61 days and no more than 180 days following the date on which (i) the Voting Agreement is terminated or (ii) Adam Foroughi is no longer involved with the Company as a member of the board of directors or as an executive officer. Conversion of Class C Common Stock After the conversion or exchange of all outstanding shares of the Company’s Class B common stock into shares of Class A common stock, all outstanding shares of Class C common stock will convert automatically into Class A common stock, on a share-for-share basis, Preferred Stock The Company’s IPO Certificate also authorizes the issuance of undesignated preferred stock with rights and preferences, including voting rights, designated from time to time by the board of directors.	1. Description of Business AppLovin Corporation (the “Company” or “AppLovin” or “we”) was incorporated in the state apps—free-to-play The Company’s operations are headquartered in Palo Alto, California, and has several operating locations in the U.S. as well as various international office locations in North America, Asia and Europe. In May 2020, the Company amended its restated certificate of incorporation (“Restated Certificate of Incorporation”) to implement a 3-for-1

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Revenue from Contracts with Customers The Company generates Business and Consumer revenue. Business Revenue includes fees paid by mobile app advertisers that use the Company’s software platform (“Software Platform”), and revenue generated from the sale of digital advertising inventory of the Company’s apps (“Apps”). Consumer Revenue consists of mobile in-app purchases Business Revenue The Software Platform provides the technology to match advertisers and third-party owners of digital advertising inventory (“Publishers”) via auctions at large scale and microsecond-level speeds. The pricing and terms for all mobile advertising arrangements are governed by the Company’s terms and conditions and generally stipulate payment terms of 30 days subsequent to the end of the month. The contract is fully cancellable at any time. For Business Revenue generated through placement of advertisements on mobile applications owned by Publishers, the Company’s performance obligation is to provide an advertiser with access to the Software Platform which facilitates the advertiser’s purchase of advertising inventory from Publishers. The Company does not control the advertising inventory prior to its transfer to the advertiser, the Company’s customer, because the Company does not have the substantive ability to direct the use of, nor obtain substantially all of the remaining benefits from the advertising inventory. The Company is not primarily responsible for fulfillment and does not have any inventory risk. The Company is an agent as it relates to the sale of third-party advertising inventory and presents revenue on a net basis. The transaction price is the product of either the number of completions of agreed upon actions or advertisements displayed and the contractually agreed upon price per advertising unit with the advertiser less consideration paid or payable to Publishers. Advertisers purchase Apps advertising inventory either through the Software Platform or through third-party advertising networks (“Ad Networks”). Revenue from the sale of advertising inventory through Ad Networks is recognized net of the amounts retained by Ad Networks as the Company is unable to determine the gross amount paid by the advertisers to Ad Networks. The Company recognizes mobile advertising revenue when the agreed upon action is completed or when the ad is displayed to users, depending on the agreed upon pricing mechanism with an advertiser Network number Consumer Revenue IAPs include fees collected from users for the purchase of virtual goods to enhance their gameplay experience. The identified performance obligation is to provide users with the ability to acquire, use, and hold virtual items over the estimated period of time the virtual items are available to the user or until the virtual item is consumed. The Company categorizes its virtual goods as either consumable or durable. Consumable virtual goods represent goods that can be consumed by a specific player action in gameplay; accordingly, the Company recognizes revenue from the sale of consumable virtual goods as the goods are consumed and the Company’s performance obligation is satisfied. Durable virtual goods represent goods that are accessible to the user over an extended period of time; accordingly, the Company recognizes revenue from the sale of durable virtual goods ratably over the period of time the goods are available to the user and the Company’s performance obligation is satisfied, which is generally the estimated average user life (“EAUL”). Payment is required at the time of purchase and the purchase price is a fixed amount. Users make IAPs through the Company’s distribution partners. The transaction price is equal to the gross amount charged to users because the Company is the principal in the transaction. IAPs fees are non-refundable. Such The EAUL represents the Company’s best estimate of the expected life of paying users for the applicable game. The EAUL begins when a user makes a first purchase of durable virtual goods and ends when a user is determined to be inactive. The Company determines the EAUL on a game-by-game basis. six The Company presents taxes collected from customers and remitted to governmental authorities on a net basis. Asset Acquisitions and Business Combinations The Company performs an initial test to determine whether substantially all of the fair value of the gross assets transferred are concentrated in a single identifiable asset or a group of similar identifiable assets, such that the acquisition would not represent a business. If that test suggests that the set of assets and activities is a business, the Company then performs a second test to evaluate whether the assets and activities transferred include inputs and substantive processes that together, significantly contribute to the ability to create outputs, which would constitute a business. If the result of the second test suggests that the acquired assets and activities constitute a business, the Company accounts for the transaction as a business combination. For transactions accounted for as business combinations, the Company allocates the fair value of acquisition consideration to the tangible assets acquired, liabilities assumed, and intangible assets acquired based on their estimated fair values. Acquisition consideration includes the fair value of any promised contingent consideration. The excess of the fair value of acquisition consideration over the fair value of acquired identifiable assets and liabilities is recorded as goodwill. Contingent consideration is remeasured to its fair value each reporting period with changes in the fair value of contingent consideration recorded in general and administrative expenses. Such valuations require management to make significant estimates and assumptions, especially with respect to intangible assets. Management’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable, and as a result, actual results may differ from estimates. In certain circumstances, the allocations of the excess purchase price are based upon preliminary estimates and assumptions and subject to revision when the Company receives final information, including appraisals and other analyses. During the measurement period, which is one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period, any subsequent adjustments are recorded to earnings. Acquisition-related costs are expensed as incurred. For transactions accounted for as asset acquisitions, the cost, including certain transaction costs, is allocated to the assets acquired on the basis of relative fair values. The Company generally includes contingent consideration in the cost of the assets acquired only when the uncertainty is resolved. The Company recognizes contingent consideration adjustments to the cost of the acquired assets prospectively using the straight-line method over the remaining useful life of the assets. No goodwill is recognized in asset acquisitions. Services and Development Agreements The Company enters into strategic agreements with mobile gaming studios (“Partner Studios”). The Company has historically allowed these Partner Studios to continue their operations with a significant degree of autonomy. In some cases, the Company bought Apps from Partner Studios and entered into service and development agreements whereby Partner Studios provide support in improving existing Apps and developing new Apps. The substantial majority of payments associated with service agreements for existing Apps are expensed to research and development when the services are rendered as the payments primarily relate to developing enhancements for the Apps. Payments for new Apps associated with development agreements are generally made in connection with the development of a particular App, and therefore, the Company is subject to development risk prior to the release of the App. Accordingly, payments that are due prior to completion of an App are generally expensed to research and development over the development period as the services are incurred. Payments due after completion of an App are generally capitalized and expensed as cost of revenue. See Note 6, “Acquisitions” for additional information. Recent Accounting Pronouncements (Issued and Not Yet Adopted) In August 2020, the FASB issued ASU 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity In May 2021, the FASB issued ASU 2021-04, Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Option. Recent Accounting Pronouncements (Issued and Adopted) In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes. In January 2020, the FASB issued ASU 2020-01, Clarifying the Interactions between Investments—Equity Securities, Investments—Equity Method and Joint Ventures, and Derivatives and Hedging.	2. Summary of Significant Accounting Policies Principles of Consolidation Reclassification Use of Estimates and long-lived assets, goodwill impairment, and fair value of derivatives and other financial instruments among others. The Company bases its estimates on assumptions, both historical and forward-looking, that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Risk and Uncertainties COVID-19 COVID-19 COVID-19 in-app COVID-19 COVID-19 Revenue from Contracts with Customers in-app Business Revenue The Software Platform provides the technology to match advertisers and third-party owners of digital advertising inventory (“Publishers”) via auctions at large scale and microsecond-level speeds. The pricing and terms for all mobile advertising arrangements are governed by the Company’s terms and conditions and generally stipulate payment terms of 30 days subsequent to the end of the month. The contract is fully cancellable at any time. For Business Revenue generated through placement of advertisements on mobile applications owned by Publishers, the Company’s performance obligation is to provide an advertiser with access to the Software Platform which facilitates the advertiser’s purchase of advertising inventory from Publishers. The Company does not control the advertising inventory prior to its transfer to the advertiser, the Company’s customer, because the Company does not have the substantive ability to direct the use of, nor obtain substantially all of the remaining benefits from the advertising inventory. The Company is not primarily responsible for fulfillment and does not have any inventory risk. The Company is an agent as it relates to the sale of third-party advertising inventory and presents revenue on a net basis. The transaction price is the product of either the number of completions of agreed upon actions or advertisements displayed and the contractually agreed upon price per advertising unit with the advertiser less consideration paid or payable to Publishers. Advertisers purchase Apps advertising inventory either through the Software Platform or through third-party advertising networks (“Ad Networks”). Revenue from the sale of advertising inventory through Ad Networks is recognized net of the amounts retained by Ad Networks as the Company is unable to determine the gross amount paid by the advertisers to Ad Networks. The Company recognizes mobile advertising revenue when the agreed upon action is completed or when the ad is displayed to users, depending on the agreed upon pricing mechanism with an advertiser or Ad Network. The number of advertisements delivered and completions of agreed upon actions is determined at the end of each month, which resolves any uncertainty in the transaction price during the reporting period. Consumer Revenue IAPs include fees collected from users for the purchase of virtual goods to enhance their gameplay experience. The identified performance obligation is to provide users with the ability to acquire, use, and hold virtual items over the estimated period of time the virtual items are available to the user or until the virtual item is consumed. The Company categorizes its virtual goods as either consumable or durable. Consumable virtual goods represent goods that can be consumed by a specific player action in gameplay; accordingly, the Company recognizes revenue from the sale of consumable virtual goods as the goods are consumed and the Company’s performance obligation is satisfied. Durable virtual goods represent goods that are accessible to the user over an extended period of time; accordingly, the Company recognizes revenue from the sale of durable virtual goods ratably over the period of time the goods are available to the user and the Company’s performance obligation is satisfied, which is generally the estimated average user life (“EAUL”). Payment is required at the time of purchase and the purchase price is a fixed amount. Users make IAPs through the Company’s distribution partners. The transaction price is equal to the gross amount charged to users because the Company is the principal in the transaction. IAPs fees are non-refundable. The EAUL represents the Company’s best estimate of the expected life of paying users for the applicable game. The EAUL begins when a user makes a first purchase of durable virtual goods and ends when a user is determined to be inactive. The Company determines the EAUL on a game-by-game The Company presents taxes collected from customers and remitted to governmental authorities on a net basis. Disaggregation of Revenue The following table present revenue disaggregated by type (in thousands): Year Ended December 31, 2018 2019 2020 Business Revenue—Apps $ 166,259 $ 397,643 $ 503,867 Consumer Revenue—Software Platform 262,997 198,305 207,285 Total Business Revenue 429,256 595,948 711,152 Consumer Revenue 54,107 398,156 739,934 Total Revenue $ 483,363 $ 994,104 $ 1,451,086 Revenue disaggregated by geography, based on user location, consists of the following (in thousands): Year Ended December 31, 2018 2019 2020 United States $ 261,734 $ 622,051 $ 895,987 United Kingdom $ 47,982 60,073 78,681 Rest of the World $ 173,647 311,980 476,418 Total Revenue $ 483,363 $ 994,104 $ 1,451,086 Cash and Cash Equivalents Accounts Receivable, net Derivatives . Fair Value of Financial Instruments non-recurring Level 1 Level 2 Level 3 Concentration of Credit Risk and Uncertainties The Company’s accounts receivable balance is derived from both domestic and international sales. The Company reviews its exposure to accounts receivable credit risk and generally requires no collateral for its accounts receivable. The Company uses various distribution partners to collect and remit payments from users of Apps for virtual goods. As of December 31, 2019, one distribution partner accounted for 12% of the accounts receivable, net. As of December 31, 2020, two distribution partners accounted for 20% and 13% of the accounts receivable, net. No individual customer accounted for 10% or more of the Company’s accounts receivable or revenue during the years ended December 31, 2019 and 2020. Property and Equipment, net Useful Life Computer equipment 3 5 Software and licenses 3 years Furniture and fixtures 3 - 5 years Leasehold improvements Over the shorter of useful life (up to 10 years) or lease term When assets are retired or otherwise disposed of, the cost and accumulated depreciation and amortization are removed from the accounts and any resulting gain or loss is reflected in operations in the period realized. Maintenance and repairs are charged to operations as incurred. Deferred Offering Costs Segment Reporting Asset Acquisitions and Business Combinations For transactions accounted for as business combinations, the Company allocates the fair value of acquisition consideration to the tangible assets acquired, liabilities assumed, and intangible assets acquired based on their estimated fair values. Acquisition consideration includes the fair value of any promised contingent consideration. The excess of the fair value of acquisition consideration over the fair value of acquired identifiable assets and liabilities is recorded as goodwill. Contingent consideration is remeasured to its fair value each reporting period with changes in the fair value of contingent consideration recorded in general and administrative expenses. Such valuations require management to make significant estimates and assumptions, especially with respect to intangible assets. Management’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable, and as a result, actual results may differ from estimates. In certain circumstances, the allocations of the excess purchase price are based upon preliminary estimates and assumptions and subject to revision when the Company receives final information, including appraisals and other analyses. During the measurement period, which is one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period, any subsequent adjustments are recorded to earnings. Acquisition-related costs are expensed as incurred. For transactions accounted for as asset acquisitions, the cost, including certain transaction costs, is allocated to the assets acquired on the basis of relative fair values. The Company generally includes contingent consideration in the cost of the assets acquired only when the uncertainty is resolved. The Company recognizes contingent consideration adjustments to the cost of the acquired assets prospectively using the straight-line method over the remaining useful life of the assets. No goodwill is recognized in asset acquisitions. Services and Development Agreements Software Development Costs internal-use Goodwill reporting unit is recorded as an impairment to goodwill. As of December 31, 2018, 2019 and 2020, no impairment of goodwill has been identified. Intangible Assets Intangible assets also include costs of intellectual property that the Company licenses from third parties for use of their content in the Company’s game. The licensing agreements include license payments, which are due over the terms of the agreements. The Company recognizes these license payments as a license asset and a license obligation at the fair value on the contract date, based on a discounted cash flow model. The amortization of the licensed asset commences when the game with licensed content is launched and when licensed agreement is executed and is recorded in cost of revenue on a straight-line method over the remaining license terms or estimated useful life of the game with licensed content, whichever is shorter. The classification of the license obligations between current and long-term is based on the expected timing of the payments to the licensor. Impairment of Long-Lived Assets Cost of Revenue co-located Sales and Marketing included in sales and marketing expenses. Costs for advertising are expensed as incurred. Advertising costs, which consist primarily of user acquisition costs, totaled $143.9 million, $436.1 million and $550.9 million for the years ended December 31, 2018, 2019 and 2020, respectively. Research and Development General and Administrative Stock-Based Compensation non-employee Income Taxes The Company recognizes deferred tax assets to the extent that these assets are more likely than not to be realized. In making such a determination, the Company considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning The Company records uncertain tax positions on the basis of a two-step more-likely-than-not The Company recognizes interest and penalties related to unrecognized tax benefits on the income tax expense line in the accompanying consolidated statements of operations. Accrued interest and penalties are included on the related tax liability line in the consolidated balance sheets. Foreign Currency Transactions Comprehensive Income (Loss) Net Income (Loss) Per Share Attributable to Common Stockholders two-class two-class Noncontrolling Interests and Redeemable Noncontrolling Interests L Recent Accounting Pronouncements (Issued and Not Yet Adopted) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. In January 2020, the FASB issued ASU No. 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815), In August 2020, the FASB issued ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) 815-40): Recent Accounting Pronouncements (Issued and Adopted) No. 2016-02, Leases (Topic 842) No. 2018-11, Targeted Improvements—Leases (Topic 842) right-of-use non-current, In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805) Clarifying the Definition of a Business, In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment 2017-04 In August 2017, the FASB issued ASU 2017-12 Derivatives and Hedging (Topic 815) Targeted Improvements to Accounting for Hedging Activities those risk management activities; and reduces the complexity of and simplifies the application of hedge accounting by preparers. This standard is effective for interim and annual reporting periods beginning after December 15, 2018. The Company adopted the standard on January 1, 2019 with no material financial statement impact upon adoption. In June 2018, the FASB issued ASU 2018-07, Compensation-Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting Compensation—Stock Compensation 2018-07 In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments 2016-13 In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement 2018-13 In March 2020, the FASB issued ASU No. 2020-04, Facilitation of the Effects of Reference Rate Reform on Financial Reporting (Topic 848) No. 2021-01, No. 2020-04 No. 2020-04.

Fair Value Measurements

Fair Value Measurements	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	4. Fair Value Measurements The following table sets forth the Company’s financial instruments that were measured at fair value by level within the fair value hierarchy on a recurring basis as of the dates indicated (in thousands): As of December 31, 2020 Balance Sheet Location Total Level 1 Level 2 Level 3 Financial Assets: Money market funds Cash and cash $ 6,413 $ 6,413 $ — $ — Embedded derivative Long-term debt 5,680 — — 5,680 Total financial assets $ 12,093 $ 6,413 $ — $ 5,680 Financial Liability: Convertible security Deferred $ 46,500 $ — $ — $ 46,500 As of September 30, 2021 Balance Sheet Location Total Level 1 Level 2 Level 3 Financial Assets: Money market funds Cash and cash $ 820,594 $ 820,594 $ — $ — Marketable equity securities Prepaid expenses and 5,165 5,165 Total financial assets $ 825,759 $ 825,759 $ — $ — Financial Liability: Convertible security Deferred acquisition $ 25,000 $ 25,000 $ — $ — Convertible Security In November 2020, the Company issued a convertible security as part of the consideration exchanged for certain mobile game Apps acquired from an independent foreign-based mobile game developer (the “Seller”). The Company elected to account for the convertible security using the fair value option. Under the fair value option, the financial liability is initially measured at its issue-date estimated fair value and subsequently remeasured at estimated fair value on a recurring basis at each reporting period date. The fair value of the convertible security was determined using the probability- weighted expected return method (“PWERM”). This valuation methodology is based on unobservable estimates and judgements, and therefore is classified as a Level 3 fair value measurement. The significant unobservable input used in the fair value measurement of the convertible security is the expected timing of occurrence of an IPO and a discount for lack of marketability derived based on the remaining term of the lock up period related to the Company’s Class A common stock into which the convertible security is convertible. Fair value measurements are highly sensitive to changes in this input and significant changes in this input would result in a significantly higher or lower fair value. For the three and nine months ended September 30, 2021, the Company recorded a total loss of $1.0 million and $3.5 million, respectively, in other income (expense), net in the Company’s condensed consolidated statements of operations due to the change in fair value of the convertible security. The convertible security is recorded in deferred acquisition costs, current, in the Company’s condensed consolidated balance sheets. In August 2021, the Seller elected to convert 50% of the convertible security with a stated value of $20.0 million into 405,205 shares of the Company’s Class A common stock at a conversion price of $49.4 per share. The lock-up Embedded Derivative Loans issued under Company’s credit agreement with the lenders party thereto and Bank of America, N.A., as administrative agent for the lenders (the “Credit Agreement”), contain certain interest adjustment features which were determined to be an embedded derivative requiring bifurcation and separate accounting as the features are not clearly and closely related to the host debt instrument. The embedded derivative was initially valued and remeasured using the “with-and-without” “with-and-without” the pre-existing terms Marketable Equity Securities The Company’s marketable equity securities consist entirely of its investment in the ordinary shares of Huuuge, Inc., a foreign-based independent mobile game developer, which completed its initial public offering and became listed on the Warsaw Stock Exchange in the first quarter of 2021. The Company had carried the investment at cost in other assets on the Company’s consolidated balance sheets in prior fiscal years. The cost basis of the investment was immaterial. The fair value of the marketable equity securities was based on the quoted market price of Huuuge, Inc.’s ordinary shares as of September 30, 2021, and therefore was classified as a Level 1 fair value measurement. For the three and nine months ended September 30, 2021, the Company recorded a total unrealized gain of $0.4 million and $5.2 million, respectively, in other income (expense), net in the Company’s condensed consolidated statements of operations as a result of remeasuring the investment to fair value. The following table presents a reconciliation of the Company’s financial asset and liability measured at fair value as of September 30, 2021 using significant unobservable inputs (Level 3), and the change in fair value (in thousands): Embedded Convertible Balance as of December 31, 2020 $ 5,680 $ 46,500 Addition related to the issuance of term loans in February 2021 5,630 — Extinguishment of term loans in February 2021 (1,130 ) — Change in fair value recognized in earnings 7,640 3,500 Settlements (17,820 ) (25,000 ) Transfers — (25,000 ) Balance as of September 30, 2021 $ — $ —	3. Fair Value Measurements The following table sets forth the Company’s financial instruments that were measured at fair value by level within the fair value hierarchy on a recurring basis as of the dates indicated (in thousands): As of December 31, 2019 Balance Sheet Location Total Level 1 Level 2 Level 3 Financial Asset: Money market funds Cash and cash equivalents $ 340,532 $ 340,532 $ — $ — Financial Liability: Interest rate swap Accrued liabilities $ 5,336 $ — $ 5,336 $ — As of December 31, 2020 Balance Sheet Location Total Level 1 Level 2 Level 3 Financial Assets: Money market funds Cash and cash equivalents $ 6,413 $ 6,413 $ — $ — Embedded derivative Long-term debt 5,680 — — 5,680 Total financial assets $ 12,093 $ 6,413 $ — $ 5,680 Financial Liability: Convertible security Deferred acquisition costs, current $ 46,500 $ — $ — $ 46,500 Convertible Security In November 2020, the Company issued a convertible security as part of the consideration exchanged for certain mobile game Apps acquired from an independent foreign-based mobile game developer, as discussed in Note 6. The Company has elected to account for the convertible security using the fair value option. Under the fair value option, the financial liability is initially measured at its issue-date estimated fair value and subsequently remeasured at estimated fair value on a recurring basis at each reporting period date. The fair value of the convertible security was determined using the probability-weighted expected return method (“PWERM”). This valuation methodology is based on unobservable estimates and judgements, and therefore is classified as a Level 3 fair value measurement. The significant unobservable input used in the fair value measurement of the convertible security is the expected timing of occurrence of an IPO, which was estimated to be 50% and 25% probable of occurring in the first and second half of 2021, respectively, as of December 31, 2020. Fair value measurements are highly sensitive to changes in this input and significant changes in this input would result in a significantly higher or lower fair value. The fair value of the convertible security was determined to be $45 million as of the issuance date. For the year ended December 31, 2020, the Company recorded a total loss of $1.5 million in other income (expense), net in the Company’s consolidated statements of operations due to the change in fair value of the convertible security. The convertible security is included in deferred acquisition costs, current, in the Company’s consolidated balance sheets. Embedded Derivative Loans issued under the Credit Agreement contain certain interest adjustment feature that was determined to be an embedded derivative requiring bifurcation and separate accounting, as discussed in Note 9. The embedded derivative was initially valued and remeasured using a “with-and-without” method. The “with-and-without” methodology involves valuing the whole instrument with and without the embedded derivative using a discounted cash flow approach. The difference of the estimated fair value between the instrument with the embedded derivative and the instrument without the embedded derivative is the fair value of the embedded derivative. This valuation methodology is based on unobservable estimates and judgements, and therefore is classified as a Level 3 fair value measurement. The significant unobservable input used in the fair value measurement of the embedded derivative is the expected timing of occurrence of an IPO, which was estimated to be 50% and 25% probable of occurring in the first and second half of 2021, respectively, as of December 31, 2020. Fair value measurements are highly sensitive to changes in these inputs and significant changes in these inputs would result in a significantly higher or lower fair value. The fair value of the embedded derivative was determined to be nominal as of the respective loan issuance dates. For the year ended December 31, 2020, the Company recorded a total gain of $5.7 million in other income (expense), net in the Company’s consolidated statements of operations due to the change in fair value of the embedded derivative. The following table presents a reconciliation of the Company’s financial asset and liability measured at fair value as of December 31, 2020 using significant unobservable inputs (Level 3), and the change in fair value (in thousands): Embedded Derivative Convertible Security Balance as of December 31, 2019 $ — $ — Initial fair value recognition — 45,000 Change in fair value recognized in earnings 5,680 1,500 Balance as of December 31, 2020 $ 5,680 $ 46,500

Revenue

Revenue	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue	3. Revenue Disaggregation of Revenue The following table presents revenue disaggregated by type (in thousands): Three Months Ended Nine Months Ended 2020 2021 2020 2021 Business Revenue—Apps $ 132,583 $ 156,208 $ 327,915 $ 475,394 Business Revenue—Software Platform 39,841 193,307 127,262 427,390 Total Business Revenue 172,424 349,515 455,177 902,784 Consumer Revenue 209,316 377,436 486,072 1,096,850 Total Revenue $ 381,740 $ 726,951 $ 941,249 $ 1,999,634 Revenue disaggregated by geography, based on user location, consists of the following (in thousands): Three Months Ended Nine Months Ended 2020 2021 2020 2021 United States 234,430 437,501 586,330 1,209,846 Rest of the World 147,310 289,450 354,919 789,788 Total Revenue $ 381,740 $ 726,951 $ 941,249 $ 1,999,634 Contract Balances Contract liabilities consist of deferred revenue and include payments received in advance of the satisfaction of performance obligations. During the three months ended September 30, 2020 and 2021, the Company recognized $44.0 million and $ million of revenue that was included in deferred revenue as of June 30, 2020 and 2021, respectively. During the nine months ended September 30, 2020 and 2021, the Company recognized $8.2 million and $ million of revenue that was included in deferred revenue as of December 31, 2019 and 2020 respectively. Unsatisfied Performance Obligations All of the Company’s unsatisfied performance obligations relate to contracts with an original expected length of one year or less.

Property and Equipment, Net

Property and Equipment, Net	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure [Text Block]	4. Property and Equipment, Net Property and equipment, net consists of the following (in thousands): December 31, 2019 2020 Computer equipment $ 29,505 $ 33,977 Leasehold improvements 421 18,176 Software and licenses 2,994 3,191 Furniture and fixtures 333 2,824 Total property and equipment 33,253 58,168 Less: accumulated depreciation (25,352 ) (29,581 ) Total property and equipment, net $ 7,901 $ 28,587 Depreciation expenses were $7.6 million, $7.9 million and $14.2 million for the years ended December 31, 2018, 2019 and 2020, respectively. As of December equipment respectively, was included in computer equipment.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	5. Commitments and Contingencies Commitments In May 2021, the Company amended a certain agreement with a cloud service provider to increase the aggregate spend commitment from $130.0 million to $300.0 million through May 2026. Contingencies From time to time, the Company may have certain contingent liabilities that arise in the ordinary course of business activities. The Company accrues a liability for such matters when it is probable that future expenditures will be made, and such expenditures can be reasonably estimated. Letters of Credit As of December 31, 2020 and September 30, 2021 the Company had outstanding letters of credit in the aggregate amount of $ 11.1 million, which were issued as security for certain leased office facilities under the Credit Agreement. These letters of credit have never been drawn upon. Legal Proceedings The Company is involved from time to time in litigation, claims, and proceedings. The outcomes of the Company’s legal proceedings are inherently unpredictable and subject to significant uncertainty. The Company records a liability when it is probable that a loss has been incurred and the amount can be reasonably estimated. If it is determined that a loss is reasonably possible and the loss or range of loss can be estimated, the reasonably possible loss is disclosed. The Company evaluates developments in legal matters that could affect the amount of liability that has been previously accrued, and related reasonably possible losses disclosed, and makes adjustments as appropriate. Significant judgment is required to determine the likelihood of matters and the estimated amount of losses related to such matters. To date, losses in connection with legal proceedings have not been material. The Company expenses legal fees in the period in which they are incurred. Indemnifications The Company enters into indemnification provisions under agreements with other parties in the ordinary course of business, including certain customers, business partners, investors, contractors and the Company’s officers, directors and certain employees. It is not possible to determine the maximum potential loss under these indemnification provisions due to the Company’s limited history of prior indemnification claims and the unique facts and circumstances involved in each particular provision. To date, losses recorded in the Company’s condensed consolidated statements of operations in connection with the indemnification provisions have not been material. As of September 30, 2021, the Company did not have any material indemnification claims that were probable or reasonably possible. Non-income Taxes The Company may be subject to audit by various tax authorities with regard to non-income tax of non-income tax for non-income taxes	5. Commitments and Contingencies Commitments had $131.2 million and $5.0 million of non-cancelable non-cancelable 2021 $ 16,389 2022 27,436 2023 28,423 2024 31,000 2025 33,000 Total non-cancelable $ 136,248 Payments made under these non-cancelable Contingencies Letters of Credit Legal Proceedings The Company is involved from time to time in litigation, claims, and proceedings. The outcomes of the Company’s legal proceedings are inherently unpredictable and subject to significant uncertainty. The Company records a liability when it is probable that a loss has been incurred and the amount can be reasonably estimated. If it is determined that a loss is reasonably possible and the loss or range of loss can be estimated, the reasonably possible loss is disclosed. The Company evaluates developments in legal matters that could affect the amount of liability that has been previously accrued, and related reasonably possible losses disclosed, and makes adjustments as appropriate. Significant judgment is required to determine the likelihood of matters and the estimated amount of a loss related to such matters. To date, losses in connection with legal proceedings have not been material. The Company expenses legal fees in the period in which they are incurred. Indemnifications Non-income non-income non-income interpretations on tax treatment and tax rates applied. The Company accrues liabilities for non-income

Acquisitions

Acquisitions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Business Combinations [Abstract]
Acquisitions	6. Acquisitions 2020 Acquisitions Business Combinations Geewa The following table summarizes the fair value of identifiable assets acquired and liabilities assumed (in thousands): Cash $ 1,043 Accounts receivable and other current assets 1,457 Intangible assets Apps—estimated useful life of 5 years 17,040 Tradename—estimated useful life of 5 years 260 Developed Technology—estimated useful life of 2 years 590 Property, equipment and other tangible asset s 369 Goodwill 9,805 Accounts payable, accrued liabilities and other liabilities (4,935 ) Total purchase consideration $ 25,629 The income approach was used to value the developed Apps and tradename. Goodwill represents the excess of the purchase price over the fair value of identifiable assets acquired and liabilities assumed at the acquisition date and is primarily attributable to the assembled workforce and expected synergies at the time of the acquisition. Goodwill is not deductible for tax purposes. Pro forma results of operations have not been presented because the effect of the acquisition was not material to the condensed consolidated statements of operations. Redemption Games— The following table summarizes the fair value of identifiable assets acquired and liabilities assumed (in thousands): Cash $ 2,787 Accounts receivable, net 1,850 Intangible assets Apps—estimated useful life of 5 years 44,000 Tradename—estimated useful life of 5 years 900 Goodwill 20,198 Other tangible assets 131 Accounts payable (2,492 ) Other liabilities (11,142 ) Total valuation 56,232 Redeemable noncontrolling interes t (2,556 ) Total purchase consideration $ 53,676 The income approach was used to value the developed Apps and tradename. Goodwill represents the excess of the purchase price over the fair value of identifiable assets acquired and liabilities assumed at the acquisition date and is primarily attributable to the assembled workforce and expected synergies at the time of the acquisition. Goodwill is not deductible for tax purposes. Pro forma results of operations have not been presented because the effect of the acquisition was not material. Machine Zone, Inc.— lenders, common stock warrants issued to Machine Zone lenders and preferred stockholders with the aggregate fair value of $ million and a settlement of the preexisting accounts receivable balance of $ million. Transaction costs incurred by the Company in connection with the acquisition, including professional fees, were $ million. The Company also assumed an intellectual property license agreement with a third-party game content provider that was included in the Machine Zone acquisition. The term of the intellectual property license agreement is set to expire in December 2021 with the option to renew for additional terms by the mutual agreement of the parties. The remaining future fixed payments under the intellectual property license agreement as of the date of the Machine Zone acquisition amounted to $37.1 million. The following table summarizes the fair value of identifiable assets acquired and liabilities assumed (in thousands): Cash $ 37,767 Accounts receivable and other current assets 27,284 Intangible assets Tradename—estimated useful life of 10 years 13,000 Apps—estimated useful life of 3—5 years 272,000 Intellectual property license—useful life of 2 years 28,551 Goodwill 82,353 Right-of-use 125,639 Property, equipment and other tangible assets 42,312 Accounts payable, accrued liabilities and other liabilitie s (81,591 ) Deferred revenue (43,200 ) License obligation (35,685 ) Operating lease liabilities (139,875 ) Total purchase consideration $ 328,555 The income approach was used to value the developed Apps and tradename. The replacement cost approach was used to value the intellectual property license asset. Goodwill represents the excess of the purchase price over the fair value of identifiable assets acquired and liabilities assumed at the acquisition date and is primarily attributable to the assembled workforce and expected synergies at the time of the acquisition. Goodwill is deductible for tax purposes. Contemporaneously with the closing of the acquisition, the Company exited from one of Machine Zone’s real estate leases. The Company accounted for this lease termination as a transaction separate right-of-use wrote-off The Company’s consolidated statements of operations for the nine months ended September 30, 2020 includes Machine Zone’s revenue of $64.2 million and pretax loss of $66.2 million for the period from the acquisition date of May 19, 2020 to September 30, 2020. See Pro forma results of operations below under “Supplemental Pro Forma Information”. Asset Acquisitions Zenlife asset acquisition earn-out earn-out earn-out In March and April 2020, the Company completed two asset acquisitions to acquire two mobile Apps from two separate independent foreign-based mobile game developers in exchange for an aggregate upfront cash consideration of $35.0 million and future earn-out three earn-out two-year earn-out During the three and nine months ended September 30, 2020, the Company recognized total earn-out costs earn-out Modification of asset acquisition-related contingent consideration earn-out earn-out, 2021 Acquisitions Business Combinations On April 20, 2021, the Company acquired adjust GmbH (“Adjust”), a mobile application tracking and analytics company. The Company purchased all of the outstanding shares of the capital stock of Adjust and settled all of Adjust’s debt for the stated purchase consideration of $980.0 million, which was composed of $352.0 million stated value of convertible securities convertible into a variable The following table summarizes the preliminary allocation of the purchase consideration to the fair value of the assets acquired and liabilities assumed (in thousands): Cash and cash equivalents $ 12,155 Accounts receivable and other current assets 21,840 Intangible assets Customer Relationships—estimated useful life of 12 years 155,000 Developed Technology—estimated useful life of 6 years 77,000 Tradename—estimated useful life of 5 years 8,000 Goodwill 776,147 Operating lease right-of-use 8,130 Property and equipment, net 1,897 Finance lease right-of-use 43,156 Other assets 3,191 Accounts payable, accrued liabilities and other current liabilities (15,540 ) Deferred revenue (5,600 ) Operating lease liabilities (8,130 ) Finance lease liabilities (43,156 ) Deferred income tax liability (66,273 ) Total purchase consideration $ 967,817 The fair values assigned to assets acquired and liabilities assumed are based on management’s best estimates and assumptions as of the reporting date. The Company has completed a preliminary valuation and expects to finalize it as soon as practical, but no later than one year from the acquisition date. The income approach was used to determine the preliminary fair value of the customer relationships, developed technology and tradename. Goodwill represents the excess of the purchase price over the preliminary fair value of identifiable assets acquired and liabilities assumed at the acquisition date and is primarily attributable to the assembled workforce and expected synergies at the time of the acquisition. For tax purposes, an estimated tax deductible goodwill of $692.5 million was generated as a result of this acquisition. The Company’s condensed consolidated statement of operations for the nine months ended September 30, 2021 includes Adjust’s revenue of $49.4 million and pretax loss of $29.6 million for the period from the acquisition date of April 20, 2021 to September 30, 2021. See Pro forma results of operations below under “Supplemental Pro Forma Information”. In May 2021, the convertible securities were converted into 6,320,688 shares of the Company’s Class A common stock. As a result, the fair value of the convertible securities was reclassified into the stockholders’ equity. Asset Acquisitions In April 2021, the Company completed two separate transactions to acquire certain mobile Apps from two foreign-based independent mobile game developers in exchange for an aggregate upfront cash consideration of $300.0 million and potential future earn-out earn-out earn-out one-time earn-out In June 2021, the Company acquired certain mobile Apps from a foreign-based independent mobile game developer in exchange for an upfront cash consideration of $130.0 million and future earn-out earn-out In August 2021, the Company acquired certain mobile Apps from a foreign-based independent mobile game developer in exchange for a total cash consideration of $150.0 million. The transaction was accounted for as an asset acquisition with $150.0 million allocated to the acquired mobile Apps, which will be amortized over 6 years. During the three and nine months ended September 30, 2021, the Company also completed a number of other asset acquisitions for an aggregate upfront cash consideration of $28.8 million and $36.8 million, respectively, as well as potential future earn-out During the three and nine months ended September 30, 2021, the Company recognized total earn-out costs earn-out In January 2021 the Company paid $60.0 million to Recoded, an independent foreign-based mobile game developer, in relation to a new mobile App acquired in 2020. In February 2021, the Company paid an additional $90.0 million to Recoded related to deferred cash consideration for the acquisition that closed in 2019. Supplemental Pro Forma Information The unaudited supplemental pro forma information below presents the combined historical results of operations of the Company, Machine Zone and Adjust for each of the periods presented as if Adjust had been acquired as of January 1, 2020 and Machine Zone had been acquired as of January 1, 2019 (in thousands): Three Months Ended Nine Months Ended 2020 2021 2020 2021 Revenue $ 429,062 $ 727,633 $ 1,156,144 $ 2,034,908 Net income (loss) (102,917 ) (51 ) (230,779 ) 3,963 The unaudited supplemental pro forma information above include the following adjustments to net income (loss) in the appropriate pro forma periods (in thousands): Three Months Ended Nine Months Ended 2020 2021 2020 2021 An (increase) in amortization expense related to the fair value of acquired identifiable intangible assets, net of the amortization expense already reflected in actual historical result s $ (5,934 ) $ — $ (42,058 ) $ (7,325 ) A net increase in revenue related to fair value adjustment 22,542 682 31,584 1,219 A decrease (increase) in expenses related to transaction expenses — — (2,617 ) 14,115 An decrease (increase) in interest expense related to new debt financing, net of interest expense related to pre-existing (2,652 ) — 97,107 (2,640 ) A (decrease) in other income—liability classified warrants — — (1,730 ) — An (increase) in tax provision (3,201 ) (156 ) (18,877 ) (1,232 ) The unaudited supplemental pro forma information has been presented for illustrative purposes only and is not necessarily indicative of results of operations that would have been achieved had the acquisitions taken place on the date indicated, or of the Company’s future consolidated results of operations. The supplemental pro forma information presented above has been derived from the Company’s historical consolidated financial statements and from the historical accounting records of Adjust and Machine Zone.	6. Acquisitions 2018 Acquisitions PeopleFun, Inc. 2018 closed earn-out The following table summarizes the allocation of the purchase price and the identifiable assets acquired as of the amendment date (in thousands): Cash $ 714 Accounts receivable 6,398 Prepaid expenses and other current assets 121 Intangible assets: Tradename—estimated useful life of 5 years 230 Games—estimated useful life of 3 years 10,220 User install base—estimated useful life of 3 months 400 Goodwill 61,790 Property and equipment 42 Other assets 17 Accounts payable (2,947 ) Accrued expenses (3,049 ) Total purchase price $ 73,936 Contingent consideration (52,429 ) Cash consideration $ 21,507 The income approach was used to value the developed Apps, installed user-base, and tradename. Goodwill, which is not deductible for tax purposes, represents the exce s In December 2018, subsequent to the completion of this acquisition, the terms of the earn-out one-time acquisition date, a modification was made to the original terms and conditions, and the Company recognized a gain of $10.8 million, representing the difference between the carrying value of the contingent consideration liability and the fair value of the amended payment, in the period the amendment was made rather than recording a change to the purchase price. As part of the agreement, the Company also agreed to issue restricted stock awards for 3,120,738 shares of Class A common stock which vest ratably over a two-year MAX Advertising Systems, Inc The following table summarizes the allocation of the purchase price and the identifiable assets acquired as of the closing date (in thousands): Cash $ 1,093 Accounts receivable 52 Prepaid expenses and other current assets 11 Intangible assets: Developed technology—estimated useful life of 3 years 3,200 Goodwill 30,038 Property and equipment 32 Other assets 334 Accounts payable (2,124 ) Other current liabilities (1 ) Total purchase price $ 32,635 Issuance of common stock (735 ) Cash consideration $ 31,900 The cost approach was utilized to value the developed technology. Goodwill, which is not deductible for tax purposes, represents the excess of the purchase price over the fair value of the identifiable assets and assumed liabilities acquired and is primarily attributable to the assembled workforce and expected synergies at the time of the acquisition. 2019 Acquisitions Business Combinations attributed to the deferred consideration expected to be paid within 12 months. The weighted average amortization period of the acquired intangible assets was 3.5 years at acquisition. Goodwill is not deductible for tax purposes. The $3.0 million deferred consideration was subsequently paid in October 2020. Recoded asset acquisition one-time earn-out thirty-six one-time earn-out thirty-six Samfinaco games asset acquisition earn-out earn-out earn-out Other asset acquisitions The Company also acquired certain assets through a number of other asset acquisitions for an aggregated cash consideration of $16.2 million, substantially all of which was attributable to acquired mobile game Apps. 2020 Acquisitions Geewa The following table summarizes the fair value of identifiable assets acquired and liabilities assumed (in thousands): Cash $ 1,043 Accounts receivable and other current assets 1,457 Intangible assets Apps—estimated useful life of 5 years 17,040 Tradename—estimated useful life of 5 years 260 Developed Technology—estimated useful life of 2 years 590 Property, equipment and other tangible assets 369 Goodwill 9,805 Accounts payable, accrued liabilities and other liabilities (4,935 ) Total purchase consideration $ 25,629 The income approach was used to value the developed Apps and tradename. Goodwill represents the excess of the purchase price over the fair value of the identifiable assets and assumed liabilities acquired and is primarily attributable to the assembled workforce and expected synergies at the time of the acquisition. Goodwill is not deductible for tax purposes. Pro forma results of operations have not been presented because the effect of the acquisition was not material to the consolidated statements of operations. Redemption Games The following table summarizes the fair value of identifiable assets acquired and liabilities assumed (in thousands): Cash $ 2,787 Accounts receivable, net 1,850 Intangible Assets Apps—estimated useful life of 5 years 44,000 Tradename—estimated useful life of 5 years 900 Goodwill 20,198 Other tangible assets 131 Accounts payable (2,492 ) Other liabilitie s (11,142 ) Total valuation 56,232 Redeemable noncontrolling interest (2,556 ) Total purchase consideration $ 53,676 The income approach was used to value the developed Apps and tradename. Goodwill represents the excess of the purchase price over the fair value of the identifiable assets and assumed liabilities acquired and is primarily attributable to the assembled workforce and expected synergies at the time of the acquisition. Goodwill is not deductible for tax purposes. Pro forma results of operations have not been presented because the effect of the acquisition was not material. Machine Zone, Inc. The Company also assumed an IP license agreement with a third-party game content provider that was included in the Machine Zone acquisition. The term of the IP license agreement is set to expire in December 2021 with the option to renew for additional terms by the mutual agreement of the parties. The remaining future fixed payments under the IP license agreement as of the date of the Machine Zone acquisition amounted to $37.1 million. The following table summarizes the fair value of identifiable assets acquired and liabilities assumed (in thousands): Cash $ 37,767 Accounts receivable and other current assets 27,284 Intangible assets Tradename—estimated useful life of 10 years 13,000 Apps—estimated useful life of 3—5 years 272,000 IP license—useful life of 2 years 28,551 Goodwill 82,353 Right-of-use assets under operating leases 125,639 Property, equipment and other tangible assets 42,312 Accounts payable, accrued liabilities and other liabilitie s (81,591 ) Deferred revenue (43,200 ) License obligations (35,685 ) Operating lease liabilities (139,875 ) Total purchase consideration $ 328,555 The income approach was used to value the developed Apps and tradename. The replacement cost approach was used to value the IP license asset. Goodwill represents the excess of the purchase price over the fair value of the identifiable assets and assumed liabilities acquired and is primarily attributable to the assembled workforce and expected synergies at the time of the acquisition. Goodwill is deductible for tax purposes. Contemporaneously with the closing of the acquisition, the Company exited from one of Machine Zone’s real estate leases. The Company accounted for this lease termination as a transaction separate from the business combination since the lease termination was negotiated primarily for the benefit of the combined entity; the Company was the party who directly negotiated this lease amendment with the lessor; and such negotiation took place contemporaneously with the negotiation of the business combination. The Company decreased the operating lease right-of-use wrote-off The Company’s consolidated statements of operations include Machine Zone’s revenue of $113.8 million and pretax loss of $89.7 million for the period from the acquisition date of May 19, 2020 to December 31, 2020. The following unaudited supplemental pro forma information presents the combined historical results of operations of the Company and Machine Zone as if the business combination had been completed on January 1, 2019. The pro forma financial information includes amortization of fair value adjustments in the appropriate pro forma periods as though the companies were combined as of the beginning of 2019. These adjustments include: • An increase in amortization expense of $62.0 million and $23.6 million related to the fair value of acquired identifiable intangible assets in 2019 and 2020, respectively; • A decrease in revenue of $61.9 million related to fair value adjustment of the deferred revenue balance in 2019 with a corresponding increase in revenue of $61.9 million in 2020; • A decrease in expenses of $8.7 million related to acquisition transaction expenses in 2020; there was no such adjustment necessary for 2019; • A decrease in interest expense of $ 147.9 106.0 • A decrease in other income of $ 9.0 • An increase in provision for income taxes of $3.3 million and $ 34.7 m The following table includes unaudited pro forma results (in thousands, except per share data): Year Ended December 31, 2019 2020 Revenue $ 1,332,476 $ 1,625,476 Net (loss) (105,353 ) (179,415 ) Net (loss) per share — basic and diluted $ (0.50 ) $ (0.83 ) Zenlife asset acquisition earn-out earn-out earn-out Athena asset acquisition earn-out 20-day tax liability. The recorded value of acquired mobile game Apps and tradename is amortized over 6 years. Additionally, the Company entered into a service and development agreement with the independent mobile game developer to support the initially acquired mobile game Apps as well as to develop new game Apps during the four-year term of the agreement. The Company is not required to make additional earn-out Other asset acquisitions earn-out three earn-out two-year earn-out earn-out The Company also acquired certain assets through a number of other asset acquisitions for an aggregated cash consideration of $ 46.4 Modification of asset acquisition-related contingent consideration — earn-out earn-out,

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Net	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, Net	7. Goodwill and Intangible Assets, Net The following table presents goodwill activity (in thousands): December 31, 2020 $ 249,773 Goodwill acquired 776,147 Foreign currency translation (28,259 ) September 30, 2021 $ 997,661 Intangible assets, net consisted of the following (in thousands): Weighted- Average Remaining Useful Life (Years) As of December 31, 2020 As of September 30, 2021 Gross Carrying Value Accumulated Amortization Net Book Value Gross Carrying Value Accumulated Amortization Net Book Value Long-lived intangible assets: Apps 4.9 $ 1,222,417 $ (232,832 ) $ 989,585 $ 1,905,750 $ (439,885 ) $ 1,465,865 Customer Relationships 11.6 — — — 149,389 (5,533 ) 143,856 User base 4.5 68,817 (17,617 ) 51,200 68,817 (24,931 ) 43,886 License asset 0.2 28,551 (10,918 ) 17,633 28,551 (24,107 ) 4,444 Developed technology 5.4 14,946 (8,489 ) 6,457 89,532 (17,645 ) 71,887 Other 6.3 23,321 (1,864 ) 21,457 33,868 (5,010 ) 28,858 Total long-lived intangible assets 1,358,052 (271,720 ) 1,086,332 2,275,907 (517,111 ) 1,758,796 Short-lived intangible assets: Apps 0.4 29,869 (25,599 ) 4,270 38,779 (36,886 ) 1,893 Total intangible assets $ 1,387,921 $ (297,319 ) $ 1,090,602 $ 2,314,686 $ (553,997 ) $ 1,760,689 As of December 31, 2020 and September 30, 2021, short-lived mobile Apps were included in prepaid expenses and other current assets. The Company recorded amortization expenses related to acquired intangible assets as follows (in thousands): Three Months Ended Nine Months Ended 2020 2021 2020 2021 Cost of revenue $ 65,535 $ 96,059 $ 137,673 $ 273,444 Sales and marketing 3,050 6,765 8,470 16,008 Total $ 68,585 $ 102,824 $ 146,143 $ 289,452	7. Goodwill and Acquired Intangible Assets, Net The following table presents goodwill activity (in thousands): December 31, 2018 $ 98,645 Goodwill acquired 38,515 Foreign currency translation (39 ) December 31, 2019 $ 137,121 Goodwill acquired 112,356 Foreign currency translation 296 December 31, 2020 $ 249,773 Acquired intangible assets, net consisted of the following (in thousands): Weighted- Remaining As of December 31, 2019 As of December 31, 2020 Gross Accumulated Amortization Net Book Gross Accumulated Amortization Net Book Value Long-lived intangible assets: Apps 4.3 $ 433,805 $ (65,838 ) $ 367,967 $ 1,222,417 $ (232,832 ) $ 989,585 User base 5.3 68,817 (7,638 ) 61,179 68,817 (17,617 ) 51,200 License asset 0.8 — — — 28,551 (10,918 ) 17,633 Developed technology 1.4 14,356 (3,224 ) 11,132 14,946 (8,489 ) 6,457 Other 7.5 804 (177 ) 627 23,321 (1,864 ) 21,457 Total long-lived intangible assets 517,782 (76,877 ) 440,905 1,358,052 (271,720 ) 1,086,332 Short-lived intangible assets: Apps 0.5 15,511 (13,086 ) 2,425 29,869 (25,599 ) 4,270 Total intangible assets $ 533,293 $ (89,963 ) $ 443,330 $ 1,387,921 $ (297,319 ) $ 1,090,602 As of December 31, 2019 and 2020, short-lived mobile Apps were included in prepaid expenses and other current assets. The Company recorded amortization expenses related to acquired intangible assets as follows (in thousands): Year Ended December 31, 2018 2019 2020 Cost of revenue $ 7,932 $ 74,787 $ 228,339 Sales and marketing 495 7,641 11,587 Total $ 8,427 $ 82,428 $ 239,926 As of December 31, 2020, the expected future amortization expense related to acquired intangible assets is estimated as follows (in thousands): 2021 $ 270,818 2022 246,333 2023 244,396 2024 244,396 2025 75,036 Thereafter 9,623 Total $ 1,090,602

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Lessee Disclosure [Abstract]
Leases	8. Leases Leases (Topic 842) and subsequently issued amendments require a lessee to recognize leases with a term greater than 12 months on the consolidated balance sheets. The Company elected the package of transition practical expedients available for expired or existing contracts, which allowed the Company to carryforward the historical assessments of (1) whether contracts are or contain leases, (2) lease classification and (3) initial direct costs. Also, for leases with a term greater than 12 months, the Company records the related right-of-use non-lease The Company leases real estate property under operating leases. The Company also leases networking equipment under arrangements with certain providers of IT infrastructure services which were accounted as finance leases or short-term operating leases. The Company’s leases do not provide a readily determinable implicit rate. Therefore, the Company estimates its incremental borrowing rate to discount the lease payments based on information available at lease commencement. The Company determines its incremental borrowing rate based on the rate of interest it would have to pay to borrow on a collateralized basis with an equal lease payment amount, over a similar term, and in a similar economic environment. Operating Leases right-of-use The Company leases networking equipment from several vendors under month-to-month Further, the Company leases networking equipment colocation space from one of its vendors located in two sectors. For one of the sectors the lease term is less than 12 months, and such leases are classified as short-term leases. The table below presents the operating lease-related assets and liabilities (in thousands): Year Ended 2019 2020 Balance Sheet Classification Operating lease right-of-use $ 14,895 $ 84,336 Operating lease right-of-use Current operating lease liabilities $ 2,510 $ 22,206 Operating lease liabilities Non-current $ 12,745 $ 71,755 Operating lease liabilities, non-current Weighted-average remaining term (years) 5.0 3.7 Weighted-average discount rate 6.0 % 4.7 % The table below presents certain information related to the lease costs for operating leases which are allocated to cost of revenue, sales and marketing, research and development, and general and administrative expenses (in thousands): Year Ended December 31, 2018 2019 2020 Operating lease cost $ 2,784 $ 3,520 $ 17,372 Short-term lease cost 3,559 3,231 8,196 Variable lease cost 276 479 2,147 Total lease cost $ 6,619 $ 7,230 $ 27,715 Cash paid for amounts included in the measurement of operating lease liabilities was $3.2 million and $23.8 million for the years ended December 31, 2019 and 2020, respectively. Right-of-use assets acquired under operating leases was $7.4 million and $10.8 million for the years ended December 31, 2019 and 2020, respectively. Networking equipment finance leases 32- right-of-use The table below presents the finance lease-related assets and liabilities (in thousands): Year Ended December 31, 2019 2020 Balance Sheet Classification Finance lease right-of-use $ 2,343 $ 5,067 Property and equipment, net Current finance lease liabilities $ 1,387 $ 2,821 Accrued liabilities Non-current $ 940 $ 2,340 Other non-current Weighted-average remaining term (years) 0.49 0.61 Weighted-average discount rate 6.0 % 6.0 % The Company recognized depreciation expenses related to finance lease of networking equipment of $5.7 million, $5.5 million and $8.4 million for the years ended December 31, 2018, 2019 and 2020, respectively. The Company recognized interest expenses related to finance lease of networking equipment of $0.4 million, $0.2 million, and $0.3 million for the years ended December 31, 2018, 2019 and 2020, respectively. Cash paid for amounts included in the measurement of finance lease liabilities was $5.9 million and $9.7 million for the years ended December 31, 2019 and 2020, respectively. One of the Company’s 2020 acquired companies entered into a sublease agreement in 2017. This agreement Year Ended Fixed sublease expense $ 5,769 Variable sublease expense 836 Sublease income (5,678 ) Variable sublease income (836 ) Net Loss $ 91 Undiscounted cash flow As of December 31, 2020 Operating Networking Total 2021 $ 26,123 $ 3,581 $ 29,704 2022 17,874 2,015 19,889 2023 12,279 596 12,875 2024 12,288 — 12,288 2025 12,601 — 12,601 Thereafter 29,783 — 29,783 Total lease payments 110,948 6,192 117,140 Less: amount representing interest 16,987 1,031 18,018 Present value of future lease payments 93,961 5,161 99,122 Less: current obligations under leases 22,206 2,821 25,027 Non-current $ 71,755 $ 2,340 $ 74,095 In addition, the Company will receive $9.4 million and $4.8 million of sublease income from one of its real estate leases in 2021 and 2022 respectively. As of December 31, 2020, we did not have any additional significant lease that had not yet commenced.

Credit Agreement

Credit Agreement	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Credit Agreement	8. Credit Agreement On August 15, 2018, the Company entered into a Credit Agreement which provided for senior secured term loans in an aggregate principal amount of $820.0 million (the “Closing Term Loans”) and a revolving credit facility of $50.0 million. On April 23, 2019, the Credit Agreement was amended to increase the senior secured term loan facility by $400.0 million, on terms identical to those applicable to the Closing Term Loans (together with the Closing Term Loans, the “Initial Term Loans”). On April 27, 2020, the Credit Agreement was further amended to modify certain negative covenants. On May 6, 2020, the Credit Agreement was further amended (the “Third Amendment”) to increase the senior secured term loan facility by an additional $300.0 million (the “Third Amendment Term Loans”). On October 27, 2020, the Credit Agreement was further amended to increase the aggregate principal amount of the revolving credit facility by an additional $540.0 million. On November 30, 2020, the Company borrowed $150.0 million under the revolving credit facility. On February 12, 2021, the Company amended the Credit Agreement to 1) increase the senior secured term loan facility by an aggregate principal amount of $597.8 million (the “Fifth Amendment Term Loans”, and together with the Initial Term Loans, the “Term Loans”), on terms identical to those applicable to the existing Initial Term Loans, the proceeds of which was partially used to repay in full the outstanding principal and accrued and unpaid interest of the Third Amendment Term Loans, totaling $298.2 million, in accordance with the pre-existing The Company evaluated the accounting for the Fifth Amendment Term Loans on a creditor-by-creditor The Company accounted for the early repayment of the Third Amendment Term loans as a debt extinguishment. As a result, the Company recognized a loss on debt extinguishment of $16.9 million during the three months ended March 31, 2021, which was recorded in interest expense and loss on extinguishment of debt on the Company’s condensed consolidated statements of operations. The loss on debt extinguishment consisted primarily of the unamortized original issue discount and debt issuance cost. On March 31, 2021, the Company drew down an additional $250.0 million from the Company’s $600.0 million revolving credit facility. A lender under the revolving credit facility is an affiliate of KKR Denali, a principal stockholder of the Company. Following such draw down, the Company had an aggregate amount of $400.0 million outstanding under the revolving credit facility, which was repaid in full with the net proceeds from the IPO in April 2021. After the effectiveness of the IPO Registration Statement, the applicable margins for both the Term Loans and the Revolving Credit Loans were reduced by 0.25% on April 16, 2021 in accordance with the pre-existing terms As of September 30, 2021, the Company was in compliance with all of the covenants.	9. Credit Agreement On August 15, 2018, the Company entered into a Credit Agreement which provided for senior secured term loans in an aggregate principal amount of $820.0 million (the “Closing Term Loans”) and a revolving credit facility of $50.0 million. On April 23, 2019, the Credit Agreement was amended to increase the senior secured term loan facility by $400.0 million, on terms identical to those applicable to the Closing Term Loans (together with the Closing Term Loans, the “Initial Term Loans”). On April 27, 2020, the Credit Agreement was further amended to modify certain negative covenants. On May 6, 2020, the Credit Agreement was further amended (the “Third Amendment”) to increase the senior secured term loan facility by an additional $300.0 million (the “Third Amendment Term Loans”, and together with the Initial Term Loans, the “Term Loans”). On October 27, 2020, the Credit Agreement was further amended to increase the aggregate principal amount of the revolving credit facility by an additional $540.0 million. The revolving loan facility has a $50.0 million letter of credit sublimit. On November 30, 2020, the Company borrowed $150.0 million under the revolving credit facility (the “Revolving Credit Loans”). The Company is required under the Credit Agreement, as amended, to make equal quarterly repayments of (i) with respect to the Initial Term Loans, $3.1 million, and (ii) with respect to the Third Amendment Term Loans, 0.25% of the aggregate principal amount of the Third Amendment Term Loans made on the effective date of the Third Amendment. The remaining principal amounts of the Term Loans are due on August 15, 2025. With respect to the Revolving Credit Loans, the principal amount is due on February 15, 2025. The Term Loans and the Revolving Credit Loans bear interest due on a quarterly basis at a rate equal to an applicable margin plus, at the Company’s option, either (a) a base rate equal to the highest of (i) the prime rate then in effect, (ii) the federal funds rate, plus 0.50% and (iii) the LIBOR rate, plus 1.0% (the “base rate”), or (b) an adjusted LIBOR rate (the “LIBOR rate”). The applicable margin with respect to the Term Loans is equal to 3.50% in the case of LIBOR rate loans and 2.50% in the case of base rate loans. The applicable margin with respect to the Revolving Credit Loans is equal to 2.50% in the case of LIBOR rate loans and 1.50% in the case of base rate loans. The applicable margins for both the Term Loans and the Revolving Credit Loans are subject to a reduction of 0.25% upon the closing of an IPO and an additional reduction of 0.25% based on the Company’s consolidated first lien secured debt to consolidated EBITDA ratio. The Credit Agreement requires the Company to prepay, subject to certain exceptions, the term loan with: • 100% of net cash proceeds above a threshold amount of certain asset sales, certain debt incurrences and casualty events, subject to, in the case of asset sales, casualty events, and sale leasebacks, (i) step-downs to (x) 50% if the Company’s consolidated first lien secured debt to consolidated EBITDA ratio is less than or equal to 3.50 to 1.00 1.00 1.00 • 50% of annual excess cash flow above a threshold amount, subject to (i) a step-down to 25% if the Company’s consolidated first lien secured debt to consolidated EBITDA ratio is less than or equal to 4.00 to 1.00, but greater than 3.50 to 1.00, and (ii) a step-down to 0% if the Company’s first lien net leverage ratio is less than or equal to 3.50 to 1.00; provided that such prepayment is required only in the amount (if any) by which such prepayment exceeds $10 million in such fiscal year. The amount of excess cash flow is subject to certain deductions and exceptions, including a dollar-for-dollar reduction based on the amount of voluntary prepayments of term loans and loans under the revolving credit facility (to the extent accompanied by a permanent commitment reduction); and • 100% of the net cash proceeds of certain other debt incurrences. The Company is permitted to voluntarily prepay or repay outstanding loans under the Revolving Credit Facility or Term Loans at any time, in whole or in part, subject to prior written notice, minimum amount requirements, and customary “breakage” costs with respect to LIBOR rate loans. Amounts prepaid under the Revolving Credit Facility may subsequently be reborrowed. The Company’s obligations under the Credit Agreement are secured by substantially all of the assets of the Company and its domestic subsidiary guarantors (other than customarily excluded assets). The Credit Agreement contains customary affirmative and negative covenants, including covenants limiting the ability of AppLovin and its restricted subsidiaries to, among other things, incur debt, grant liens, undergo certain fundamental business changes, make investments, pay-out dividends to third parties, dispose of assets, and enter into transactions with affiliates, in each case, subject to limitations and exceptions set forth in the Credit Agreement. The Credit Agreement also contains customary events of default that include, among other things, certain payment defaults, cross defaults to other indebtedness, covenant defaults, change of control defaults, judgment defaults, and bankruptcy and insolvency defaults. If an event of default exists, the lenders may require the immediate payment of all obligations under the Credit Agreement and may exercise certain other rights and remedies provided for under the Credit Agreement, the other loan documents and applicable law. As of December 31, 2020, the Company was in compliance with all of the covenants. At the time of issuances, the Company evaluated the Term Loans and Revolving Credit Loans and determined that the contingent interest adjustment feature, which reduces the applicable margins for both the Term Loans and the Revolving Credit Loans upon the closing of an IPO, is an embedded derivative that requires bifurcation and separate accounting as the feature is not clearly and closely related to the host instrument. The Company determined that the value of this embedded derivative was nominal as of the issuance dates. The embedded derivative was recorded at fair value each reporting period, with changes in fair value recorded in interest income and other gains in the Company’s consolidated statements of operations. No hedge accounting treatment was applied. For details regarding the fair value measurement of the embedded derivative, see Note 3. The Company incurred $53.1 million of discounts and debt issuance costs in connection with the Term Loans which were capitalized and recorded as a reduction to the carrying amount of the Term Loan in the consolidated balance sheets. The Company amortizes these costs to interest expense under the effective interest rate method. During the years ended December 31, 2019 and 2020, the Company recognized total interest expense of $65.9 million and $58.8 million, respectively. These amounts are included in interest expense in the Company’s consolidated statements of operations. The aggregate future maturities of long-term debt as of December 31, 2020 are as follows (in thousands): 2021 $ 15,210 2022 15,210 2023 15,210 2024 15,210 2025 1,583,492 Total outstanding term loan principal 1,644,332 Embedded derivative (5,680 ) Unaccreted discount and debt issuance costs (39,452 ) Total debt 1,599,200 Less: short-term debt 15,210 Long-term debt $ 1,583,990

Derivative Instruments

Derivative Instruments	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Derivative Instruments	9. Cash Flow Hedges The Company manages exposure to market risk associated with fluctuating interest rates with the use of interest rate derivative financial instruments, namely interest rate swaps. The Company does not use derivatives for trading or speculative purposes. On November 14, 2018, the Company entered into an interest rate swap agreement as part of its interest rate risk management strategy in connection with the term loan. The notional amount for the swap was $410.0 million. The swap was a receive-variable (one-month LIBOR) and pay-fixed (2.9065%) The Company applied the hedge accounting provisions of the critical terms match hedge, and formally documented at inception all relationships between hedging instruments and hedged items, as well as its risk management objectives and strategies for undertaking the various hedges. The critical terms of the swap and hedged item coincided (notional amount, interest rate reset dates, interest rate payment dates, and underlying index), the hedge was expected to offset changes in expected cash flows due to fluctuations in one-month LIBOR Unrealized changes in the fair value of derivatives accounted for as a critical term match hedge were reported in other comprehensive income (loss) and subsequently reclassified to earnings in the same period or periods during which the hedged forecasted transaction affected earnings. The interest rate swap contract expired on December 31, 2020 and the settlement value of the interest rate swap liability was reclassified to interest expense and loss on settlement of debt. For the three and nine months ended September 30, 2020, the Company recognized $2.9 million and $6.7 million of realized loss related to hedged transaction, respectively, which were recorded in interest expense and loss on settlement of debt in the Company’s condensed consolidated statements of operations. As of September 30, 2020, the settlement value of the interest rate swap liability before tax effect was $2.9 million and was included in accrued liabilities and reported in other comprehensive income net of tax effect.	10. Derivative Instruments The Company manages exposure to market risk associated with fluctuating interest rates with the use of interest rate derivative financial instruments, namely interest rate swaps. The Company does not use derivatives for trading or speculative purposes. On November 14, 2018, the Company entered into an interest rate swap agreement as part of its interest rate risk management strategy in connection with the term loan (See Note 9). The notional amount for the swap was $410.0 million. The swap was a receive-variable (one-month pay-fixed The Company applied the hedge accounting provisions of the critical terms match hedge, and formally documented at inception all relationships between hedging instruments and hedged items, as well as its risk management objectives and strategies for undertaking the various hedges. The critical terms of the swap and hedged item coincided (notional amount, interest rate reset dates, interest rate payment dates, and underlying index), the hedge was expected to offset changes in expected cash flows due to fluctuations in one-month Unrealized changes in the fair value of derivatives accounted for as a critical term match hedge were reported in other comprehensive income (loss) and subsequently reclassified to earnings in the same period or periods during which the hedged forecasted transaction affected earnings. For the years ended December 31, 2018, 2019 and 2020, the Company recognized zero, $2.7 million and $9.5 million, respectively, of realized loss related to hedged transaction which were recorded in interest expense. As of December 31, 2019, the settlement value of the interest rate swap liability before tax effect was $5.3 million and was included in other accrued liabilities and other non-current

Convertible Preferred Stock

Convertible Preferred Stock	12 Months Ended
	Dec. 31, 2020
Class of Stock Disclosures [Abstract]
Convertible Preferred Stock	11. Convertible Preferred Stock On July 13, 2018, the Company signed an agreement with KKR Denali Holdings L.P. (“KKR Denali”) for a $400.0 million equity investment by KKR Denali. Pursuant to such agreement, on August 15, 2018, the Company issued 109,090,908 shares of Series A Preferred Stock to KKR Denali in exchange for their investment. The Company’s Restated Certificate of Incorporation designates and authorizes 109,090,908 shares of Series A Preferred Stock, $0.00003 par value per share, of the Company. The holders of Series A convertible preferred stock have various rights and preferences as follows: Voting— Holders of Series A convertible preferred stock, voting together as a single class on an as-converted preferred stock to approve, among other actions, a liquidation event, an amendment, waiver, or repeal of provisions of the Company’s Restated Certificate of Incorporation or Bylaws in a way that adversely affects the rights, privileges and obligations of the preferred stock, a change to the number of directors of the Company, and a declaration or payment of any dividend. Holders of Series A convertible preferred stock, voting as a separate class, are entitled to elect two members to the Company’s Board of Directors (the “Board”). Holders of common stock, voting as a separate class, are entitled to elect five members to the Board. Holders of common stock and preferred stock, voting together as a single class on an as converted basis, are entitled to elect all remaining directors. Dividends— Liquidation Preference— winding-up After payment of the Liquidation Preference to the holders of preferred stock, the remaining assets of the Company shall be distributed ratably to the holders of common stock. If the holders of preferred stock would have been entitled to a larger distribution had they converted their shares to common stock, then the preferred stock will be deemed to have converted to common stock. Redemption— Conversion— one-to-one. Each share of preferred stock will automatically be converted into shares of common stock at the then-effective conversion rate of such shares upon the earlier of (i) the closing of a firm commitment underwritten public offering pursuant to an effective registration statement under the Securities Act of 1933, as amended, covering the offer and sale of common stock of the Company to the public not less than $75.0 million or (ii) the consent of holders of at least a majority of the then-outstanding shares of preferred stock, voting together as a single class on an as-converted Notwithstanding anything to the contrary herein, in connection with the IPO, if (a) the price per share of common stock sold to the public in such IPO as set forth on the cover of the Company’s final prospectus (prior to underwriting discounts and expenses) (the “IPO Price”) is less than the Conversion Price of the Series A Preferred Stock prior to giving effect to this provision, then the Conversion Price of the Series A Preferred Stock shall be adjusted downward to an amount equal to the IPO Price (the “IPO Conversion Price Adjustment”) and the Conversion Price of the Series A preferred stock as so adjusted shall be used to determine the number of shares of Class A common stock to be received by the holders of Series A Preferred Stock upon conversion of the Series A preferred stock in connection with the IPO. The IPO Conversion Price Adjustment, if any, shall occur as of immediately prior to the effectiveness of the Company’s registration statement for such IPO. Anti-Dilution Protection

Common Stock

Common Stock	12 Months Ended
	Dec. 31, 2020
Common Stock [Abstract]
Common Stock	12. Common Stock The Company’s Restated Certificate of Incorporation, as restated as of May 20, 2020, authorizes the Company to issue 429,600,000 shares of common stock, consisting of 386,400,000 shares of Class A common stock, $0.00003 par value per share, and 43,200,000 shares of Class F common stock, $0.00003 par value per share. The holders of the Class F common stock and the holders of the Class A common stock shall be entitled to receive dividends from time to time when declared by the Board of Directors in the form of shares of common stock or rights to acquire common stock. In the event of any consolidation, merger, or other combination transactions in which shares of common stock are exchanged for or converted into other stock or securities, the shares of Class F common stock and Class A common stock shall be entitled to be exchanged or converted into the same kind. The number of common stock shares authorized, issued, outstanding and reserved for future issuance as of December 31, 2020 are as follows: Shares Issued and Options Common Stock A 386,400,000 183,800,251 202,599,749 Common Stock F 43,200,000 42,564,150 635,850 Total shares of Common Stock 429,600,000 226,364,401 203,235,599 Voting Rights So long as a majority of the shares of Class F common stock outstanding as of the date of the Company’s Restated Certificate of Incorporation, as restated as of May 20, 2020, remain outstanding, holders of Class F common stock, voting together as a single class on an as-converted Distribution Liquidation Conversion— Each share of Class F common stock will automatically be converted into one share of Class A common stock upon the earlier of (i) an initial public offering of the Company’s stock or (ii) the consent of holders of at least a majority of the then-outstanding shares of Class F common stock. Further, if a share of Class F common stock is purchased by an investor in connection with an equity financing, approved by the Board, in which the aggregate Class F common stock sold does not constitute more than 15% of the preferred stock offered by the Company in the equity financing, a holder may elect to convert such share of Class F common stock into a share of a subsequent series of preferred stock. Warrant L

Stock-based Compensation

Stock-based Compensation	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Stock-based Compensation	10. Stock-based Compensation In March 2021, the Company’s board of directors adopted, and its stockholders approved, the 2021 Equity Incentive Plan, the 2021 Partner Studio Incentive Plan and the Employee Stock Purchase Plan, all of which became effective on the business day immediately prior to the effective date of the IPO Registration Statement: 2021 Equity Incentive Plan The 2021 Equity Incentive Plan (the “2021 Plan”) provides for the grant of incentive stock options, within the meaning of Section 422 of the Internal Revenue Code of 1986, as amended (the “Code”), to the Company’s employees and any parent and subsidiary companies’ employees, and for the grant of nonstatutory stock options, restricted stock, restricted stock units (“RSUs”), stock appreciation rights (“SARs”), performance units, and performance shares to the Company’s employees, directors, and consultants and the Company’s parent and subsidiary companies’ employees and consultants. A total of 39,000,000 shares of the Company’s Class A common stock were reserved for issuance pursuant to the 2021 Plan. The number of shares available for issuance under the 2021 Plan will also include an annual increase on the first day of each fiscal year beginning on January 1, 2021, equal to the least of (a) 39,000,000 shares, (b) five percent (5%) of the outstanding shares of all classes of the Company’s common stock as of the last day of the immediately preceding fiscal year, or (c) such other amount as the Company’s board of directors may determine. Immediately prior to the effectiveness of the 2021 Plan, the 2011 Plan was terminated, and no further awards will be granted thereunder. All outstanding awards will continue to be governed by their existing terms. In the three and nine months ended September 30, 2021 the Company granted 870,410 and 6,908,924 RSUs to certain employees under the 2021 Plan at the weighted average grant date fair value of $58.92 and $58.60 per RSU, respectively. The RSUs generally vest over an approximate period of four five 2021 Partner Studio Incentive Plan The 2021 Partner Studio Incentive Plan (the “2021 Partner Plan”) provides for the grant of nonstatutory stock options, restricted stock, RSUs, SARs, performance units, and performance shares to individuals or entities engaged by the Company or a parent or subsidiary of the Company to render bona fide services to the party engaging such individual or entity. A total of 390,000 shares of the Company’s Class A common stock are reserved for issuance pursuant to the 2021 Partner Plan. In August 2021, the Company granted 359,623 RSUs under the 2021 Partner Plan. The RSUs generally vest over an approximate period of four five Employee Stock Purchase Plan The Employee Stock Purchase Plan (the “ESPP”) permits participants to purchase shares of the Company’s Class A common stock through contributions (in the form of payroll deductions or otherwise to the extent permitted by the administrator) of up to 15% of their eligible compensation. Amounts contributed and accumulated by the participant will be used to purchase shares of the Company’ Class A common stock at the end of each 6-month purchase overlapping 24-month offering A total of 7,800,000 shares of the Company’s Class A common stock are available for sale under the ESPP. The number of shares of the Company’s Class A common stock that will be available for sale under the ESPP also includes an annual increase on the first day of each fiscal year beginning with fiscal year 2022, equal to the least of: (a) 7,800,000 shares, (b) one percent (1%) of the outstanding shares of all classes of the Company’s common stock as of the last day of the immediately preceding fiscal year, or (c) such other amount as the Company’s board of directors may determine. 2011 Equity Incentive Plan The Company’s 2011 Equity Incentive Plan (the “2011 Plan”) provides for the grant of stock options to employees, consultants, and advisors of the Company. Options granted under the 2011 Plan may be either incentive stock options or nonqualified stock options. Incentive stock options may be granted only to Company employees, including directors who are also employees. As noted above, immediately prior to the effectiveness of the 2021 Plan, the 2011 Plan was terminated, and no further awards will be granted thereunder. All outstanding awards will continue to be governed by their existing terms. The Company recognized stock-based compensation expense for the periods indicated as follows (in thousands): Three Months Ended Nine Months Ended 2020 2021 2020 2021 Cost of revenue $ 126 $ 922 $ 204 $ 1,504 Sales and marketing 1,571 4,774 2,812 8,814 Research and development 6,823 20,110 10,692 40,148 General and administrative 2,348 8,919 5,654 41,362 Total $ 10,868 $ 34,725 $ 19,362 $ 91,828 For the three and nine months ended September 30, 2021, total stock-based compensation expense included $0.3 million and $0.9 million, respectively, associated with awards that may be settled in stock of one of the Company’s subsidiaries. Early Exercise of Stock Options additional paid-in-capital as During 2019 and 2020, the Company provided financing to certain employees in the form of promissory notes to early exercise stock options. These promissory notes are partially collateralized by shares and, for accounting purposes, in-substance to repurchase, respectively. The principal balances of nonrecourse promissory notes outstanding amounted to $40.4 million and $15.1 million as of December 31, 2020 and September 30, 2021, respectively.	13. Stock-based Compensation The Company’s 2011 Equity Incentive Plan (the “Plan”) provides for the granting of stock options to employees, consultants, and advisors of the Company. Options granted under the Plan may be either incentive stock options or nonqualified stock options. Incentive stock options may be granted only to Company employees, including officers and directors who are also employees. Nonqualified stock options may be granted to Company employees, consultants and advisors. The Plan also provides for grants of restricted stock. As of December 31, 2020, the Company reserved 125,316,000 shares of Class A common stock for issuance under the Plan. Options remaining available for issuance under the Plan were 3,486,785 as of December 31, 2020. Options under the Plan may be granted for periods of up to 10 years and generally vest over four years. The Company recognized stock-based compensation expense for the periods indicated as follows (in thousands): 2018 2019 2020 Cost of revenue $ 517 $ 124 $ 982 Sales and marketing 2,582 1,922 10,668 Research and development 1,009 5,009 36,852 General and administrative 1,357 3,167 13,885 Total stock-based compensation expense $ 5,465 $ 10,222 $ 62,387 For the year ended December 31, 2020 total stock-based compensation expense included $0.9 million associated with awards that may be settled with one of the Company’s subsidiaries. Stock Options The weighted-average assumptions used to estimate the fair va l Year Ended 2018 2019 2020 Weighted-average expected term 6.00 6.05 5.94 Expected volatility 62 % 43 % 39 % Risk-free interest rate 2.58 % 1.91 % 0.56 % Dividend yield 0 % 0 % 0 % The Company’s activity of the stock options under the Plan for the years ended December 31, 2019 and 2020 was as follows: Number of Weighted Weighted Balances at December 31, 2018 8,370,552 $ 2.66 9.2 Granted 12,199,200 4.36 Exercised (1,011,873 ) 2.61 Forfeited (1,158,528 ) 2.82 Expired (4,221 ) 2.81 Balances at December 31, 2019 18,395,130 $ 3.78 9.2 Granted 13,158,430 8.41 Exercised (871,668 ) 2.65 Forfeited (425,001 ) 1.68 Expired (1,367,367 ) 4.64 Balances at December 31, 2020 28,889,524 $ 5.92 8.8 Vested and exercisable at December 31, 2020 17,099,956 $ 5.26 8.6 Vested and expected to vest at December 31, 2020 25,023,502 $ 6.22 8.9 The intrinsic value of options outstanding as of December 31, 2019 and 2020, was $23.4 million and $1.8 billion, respectively. As of December 31, 2019 and 2020, there was approximately $26.8 million and $132.2 million, respectively, of total unrecognized compensation costs related to unvested options granted, which is expected to be recognized over the weighted-average vesting period of 2.9 years. Early Exercise of Stock Options paid-in-capital th one 36-months. The Company has 11,337 shares and 19,800 shares of Class A common stock subject to repurchase as of December 31, 2019 and 2020, respectively. The liability for the repurchase as of December 31, 2019 and 2020 included in accrued liabilities was $0.1 million and $0.1 million, respectively. During the years ended December 31, 2019 and 2020, the Company provided financing to certain employees in the form of promissory notes to early exercise stock options. These promissory notes are partially collateralized by shares and in-substance As of December 31 , 2019 and 2020 , Restricted Stock directors. The Company’s activity of the outstanding restricted stock awards for Cla s , Number of Weighted Balances at December 31, 2018 3,664,653 $ 1.68 Granted 3,267,792 1.97 Repurchased (59,637 ) 1.68 Vested (2,948,394 ) 1.83 Balances at December 31, 2019 3,924,414 $ 1.81 Granted — — Repurchased — — Vested (2,687,643 ) 1.85 Balances at December 31, 2020 1,236,771 $ 1.71 As of December 31, 2019 and 2020, there was $6.7 million and $1.8 million, respectively, of total unrecognized compensation cost related to unvested restricted stock awards. That cost is expected to be recognized over a weighted-average period of 1.1 years.

Net Income (Loss) Per Share

Net Income (Loss) Per Share	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	11. Net Income (Loss) Per Share Basic and diluted net income (loss) per share attributable to common stockholders is computed in conformity with the two-class two-class The following table sets forth the computation of basic and diluted net income (loss) per share attributable to common stockholders (in thousands, except share and per share data): Three Months Ended Nine Months Ended 2020 2021 2020 2021 Basic EPS Numerator: Net income (loss) attributable to AppLovin $ (89,688 ) $ 178 $ (106,415 ) $ 4,080 Less: Income attributable to convertible preferred stock — — — (499 ) Income attributable to options exercised via promissory notes — (1 ) — (49 ) Income attributable to unvested early exercised options — — — (13 ) Income attributable to unvested RSA’s — — — (7 ) Net income (loss) attributable to common stock—Basic $ (89,688 ) $ 177 $ (106,415 ) $ 3,512 Denominator: Weighted-average shares used in computing net income (loss) per share—Basic 214,638,272 368,427,532 212,998,263 309,353,304 Net income (loss) per share attributable to common stock—Basic $ (0.42 ) $ 0.00 $ (0.50 ) $ 0.01 Three Months Ended Nine Months Ended 2020 2021 2020 2021 Diluted EPS Numerator: Net income (loss) attributable to AppLovin $ (89,688 ) $ 178 $ (106,415 ) $ 4,080 Less: Income attributable to convertible preferred stock — — — (475 ) Income attributable to options exercised via promissory notes — (1 ) — (47 ) Income attributable to unvested early exercised options — — — (12 ) Income attributable to unvested RSA’s — — — (7 ) Net income (loss) attributable to common stock—Diluted $ (89,688 ) $ 177 $ (106,415 ) $ 3,539 Denominator: Weighted-average shares used in computing net income (loss) per share—Basic 214,638,272 368,427,532 212,998,263 309,353,304 Weighted-average dilutive stock options, RSUs, warrants and other convertible securities — 15,897,253 18,073,488 Weighted-average shares used in computing net income (loss) per share—Diluted 214,638,272 384,324,785 212,998,263 327,426,792 Net income (loss) per share attributable to common stock—Diluted $ (0.42 ) $ 0.00 $ (0.50 ) $ 0.01 The following table presents the forms of antidilutive potential common shares: As of September 30, 2020 2021 Convertible preferred stock 109,090,908 — Stock options exercised for promissory notes 7,862,499 2,884,999 Shares issuable upon conversion of Athena convertible security — 334,946 Early exercised stock options 19,800 879,600 Unvested RSAs 1,908,687 242,316 Stock options 20,439,544 23,736 Unvested RSUs — 2,828 ESPP — 223,448 Total antidilutive potential common shares 139,321,438 4,591,873	14. Net Income (Loss) Per Share The following table sets forth the computation of basic and diluted net income (loss) per share attributable to common stockholders for the years ended December 31, 2018, 2019 and 2020 (in thousands, except share and per share data): Year Ended December 31, 2018 2019 2020 Basic EPS Numerator: Net income (loss) $ (259,995 ) $ 119,040 $ (125,187 ) Less: Income attributable to convertible preferred stock — (39,500 ) — Income attributable to options exercises by promissory notes — (1,088 ) — Income attributable to unvested early exercised options — (39 ) — Income attributable to unvested RSA’s — (2,037 ) — Net income (loss) attributable to common stock $ (259,995 ) $ 76,376 $ (125,187 ) Denominator: Weighted-average shares used in computing net income (loss) per share: Basic 189,533,630 210,937,147 214,936,545 Net income (loss) per share attributable to common stock: Basic $ (1.37 ) $ 0.36 $ (0.58 ) Diluted EPS Numerator: Net income (loss) $ (259,995 ) $ 119,040 $ (125,187 ) Less: Income attributable to convertible preferred stock — (39,329 ) — Income attributable to options exercises by promissory notes — (1,083 ) — Income attributable to unvested early exercised options — (39 ) — Income attributable to unvested RSA’s — (2,028 ) — Net income (loss) attributable to common stock $ (259,995 ) $ 76,561 $ (125,187 ) Denominator: Weighted-average shares used in computing net income (loss) per share: Basic 189,533,630 210,937,147 214,936,545 Weighted-average dilutive stock options — 1,428,282 — Weighted-average shares used in computing net income (loss) per share: Diluted 189,533,630 212,365,429 214,936,545 Net income (loss) per share attributable to common stock: Diluted $ (1.37 ) $ 0.36 $ (0.58 ) The following table presents the forms of antidilutive potential common shares: Year Ended December 31, 2019 2020 Convertible preferred stock 109,090,908 109,090,908 Options exercised for promissory notes 5,760,000 8,022,499 Early exercised options 11,337 19,800 Unvested RSAs 3,924,414 1,236,771 Options 7,439,700 20,754,985 The table above does not include the convertible security issued in 2020. This security is convertible into the Company’s common stock starting 61 days following the effective date of an initial public offering of the Company. The convertible security may be converted, at the option of the holder, into a number of shares of the Company’s Class A Common Stock equal to $40.0 million divided by a conversion price equal to (i) the preceding 20-day

Income Taxes

Income Taxes	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes The Company is subject to income taxes in the U.S. and in foreign jurisdictions. The Company bases its interim tax accruals on an estimated annual effective tax rate applied to year-to-date income a year-to-date adjustment statutory rate primarily due to net excess tax benefits from stock-based compensation, foreign derived intangible income deduction, valuation allowance against losses which cannot be realized and the foreign tax rate differential. On March 11, 2021, the American Rescue Plan Act (“ARPA”) was enacted. The ARPA contains numerous income tax provisions, such as expanding the definition of covered employees. The ARPA has no impact on the income tax provision (benefit) for the nine months ended September 30, 2021. During the nine months ended September 30, 2021, there were no material changes to the Company’s unrecognized tax benefits, and the Company does not expect material changes in its unrecognized tax benefits within the next twelve months.	15. Income Taxes Net income (loss) before income taxes for the years ended December 31, 2018, 2019 and 2020, includes the following components (in thousands): Year Ended December 31, 2018 2019 2020 U.S. $ (286,809 ) $ 149,797 $ (118,296 ) Foreign 46,550 (23,563 ) (17,410 ) Net income (loss) before income tax $ (240,259 ) $ 126,234 $ (135,706 ) Provision for (benefit from) income taxes for the years ended December 31, 2018, 2019 and 2020 consist of the following (in thousands): Year Ended December 31, 2018 2019 2020 Current: Federal $ 16,905 $ 23,703 $ 20,162 State 689 1,888 4,087 Foreign 1,329 568 4,027 18,923 26,159 28,276 Deferred: Federa l 993 (720 ) (29,235 ) State (31 ) (99 ) (4,800 ) Foreign (149 ) (18,146 ) (4,013 ) 813 (18,965 ) (38,048 ) Total provision for (benefit from) income taxes $ 19,736 $ 7,194 $ (9,772 ) The reconciliation of federal statutory income tax rate to the effective income tax rate is as follows (in thousands): Year Ended December 31, 2018 2019 2020 Tax provision (benefit) at U.S. federal statutory rate $ (50,454 ) $ 26,509 $ (28,498 ) State income taxes, net of federal benefit 539 1,412 (1,137 ) Foreign income taxed at different rates (9,690 ) 2,887 8,710 Change in foreign deferred tax rate — (17,143 ) (6,038 ) Stock-based compensation 830 1,671 10,347 Foreign-derived intangible income (6,246 ) (8,600 ) (3,518 ) Research and development credits (933 ) (1,025 ) (2,561 ) Transaction costs — 428 601 Extinguishments of acquisition-related contingent consideration — — 12,237 Effect of the Tax Act—transition tax 1,074 — — Global intangible low-taxed income 7,453 — — Note premium costs 67,018 — — Warrant Expense 12,259 — — Other (2,114 ) 1,055 85 Total provision for (benefit from) income taxes $ 19,736 $ 7,194 $ (9,772 ) In August 2019, the Company acquired certain mobile game apps from an entity based in Cyprus. A deferred tax liability was created due to basis differences of assets acquired. In December 2019, pursuant to a year-end In December 2017, the Tax Cuts and Jobs Act of 2017 (“Tax Act”) was enacted into law and the new legislation contains several key provisions that affected the Company, including a reduction of the federal corporate income tax rate to 21% effective January 1, 2018. The following summarizes the current and deferred tax assets and liabilities (in thousands): As of December 31, 2019 2020 Deferred tax assets: Accrued expenses and reserves $ 1,871 $ 4,757 Stock-based compensation 1,134 1,955 Tax credit carryforwards 183 2,526 Federal benefit from state taxes 553 1,047 Net operating loss 2,959 3,787 Interest rate swap 1,171 — Embedded derivative — (1,303 ) Identified intangibles 6,028 8,996 Operating lease liability 3,785 20,551 Valuation allowance — (531 ) Total deferred tax assets 17,684 41,785 Deferred tax liabilities: Depreciation and amortization (8,419 ) (6,857 ) Operating lease right-of-use assets (3,270 ) (20,345 ) Total deferred tax liabilities (11,689 ) (27,202 ) Net deferred tax assets $ 5,995 $ 14,583 As of December 31 , 2019 and 2020, the Company has federal net operating loss carryforwards of $2.8 million and $19.6 million, respectively, to reduce future taxable income. The net operating losses are not subject to expiration. As of December 31, 2019 and 2020, the Company had federal tax credit carryforwards of $0 and $0.9 million, respectively, to offset future tax liability. The credit carryforwards will begin to expire in 2035. As of December 31, 2019 and 2020, the Company had California net operating loss carryforwards of $3.8 million and $9.2 million, respectively, to reduce future taxable income. The net operating losses will begin to expire in 2037. As of December 31, 2019 and 2020, the Company had California tax credit carryforwards of $1.4 million and $4.8 million, respectively, to offset future tax liability. The credit carryforwards are not subject to expiration. As of December 31, 2019 and 2020, the Company had Texas tax credit carryforwards of $0 and $0.3 million, respectively, to offset future tax liability. The credit carryforwards will begin to expire in 2040. The valuation allowance increased by $0.5 million during the calendar year 2020. In assessing the realizability of the Company’s deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management’s assessment is based on the weight of available evidence, including cumulative losses since inception and expected future losses and as such, management believes it is more likely than not that the deferred tax assets will be realized. Accordingly, no valuation allowance has been established in the U.S. and all foreign jurisdictions except as noted above. Internal Revenue Code Section 382 places a limitation on the amount of taxable income that can be offset by net operating loss carryforwards and tax credits after a greater than 50% change in control in ownership; California has similar rules. The Company’s capitalization described herein may have resulted in such a change. Utilization of the net operating loss carryforwards may be subject to annual limitations under IRC Section 382 and similar state provisions. The annual limitation may result in the expiration of the net operating loss carryforwards before utilization. The Company has not provided U.S. income or foreign withholding taxes on the undistributed earnings of its foreign subsidiaries as of December 31, 2019 and 2020, because it intends to permanently reinvest such earnings outside of the U.S. If these foreign earnings were to be repatriated in the future, the related U.S. tax liability will be immaterial, due to the participation exemption put in place in the Tax Act . Uncertain Tax Positions The following table summarizes the activity related to the gross unrecognized tax benefits (in thousands): As of December 31, 2019 2020 Balance at beginning of year $ 2,858 $ 6,646 Increases related to prior year positions 2,377 4,681 Increases related to current year positions 1,581 3,498 Decreases related to lapse of statutes (170 ) (424 ) Balance at end of year $ 6,646 $ 14,401 The Company accounts for uncertain tax positions under ASC 740. As of December 31, 2019 and 2020, there was approximately $6.6 million and $14.4 million of unrecognized tax benefits, respectively. Of the unrecognized tax benefits, $5.8 million and $13.0 million represents the amount that if recognized, would favorably affect the effective income tax rate in 2019 and 2020, respectively. The Company does not expect a significant change to its unrecognized tax benefits or recorded liabilities over the next twelve months. The unrecognized tax benefits may increase or change during the next year for items that arise in the ordinary course of business. The Company records interest and penalties related to unrecognized tax benefits in income tax expense. As of December 31, 2018, 2019 and 2020, the Company had approximately $0.3 million, $0.7 million and $2.3 million of interest and penalties, respectively. The Company’s primary tax jurisdiction is the United States. The tax return for years 2017 through 2020 remain open to examination for federal purposes, and 2016 through 2020 for the other major domestic taxing jurisdictions to which the Company is subject.

Defined Contribution Plan

Defined Contribution Plan	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
Defined Contribution Plan	16. Defined Contribution Plan The Company sponsors a defined-contribution savings plan under Section 401(k) of the Internal Revenue Code of 1986, as amended, covering substantially all full-time U.S. employees. Participating employees may contribute up to 100% of their eligible compensation up to the annual Internal Revenue Service contribution limit. The 401(k) Plan was adopted in 2014. For 2019 and 2020, the Company matched employee contributions 100% for the first 1% and 50% through a maximum of 6%, totaling $0.9 million and $2.2 million, respectively.

Geographic Information

Geographic Information	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Geographic Information	17. Geographic Information The following table presents the property and equipment, net by geographic area (in thousands): As of December 31, 2018 2019 2020 United States $ 8,295 $ 7,679 $ 27,942 All other countries 232 222 645 Total property and equipment, net $ 8,527 $ 7,901 $ 28,587 For information regarding revenue disaggregated by geography, see Note 2—Summary of Significant Accounting policies, Revenue from Contracts with Customers.

Related Party Transactions

Related Party Transactions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions	13. Related Party Transactions On February 12, 2021, the Company amended the Credit Agreement. See Note 8. In connection with this amendment, the Company paid $0.8 million in fees to KKR Capital Markets LLC, which is affiliated with KKR Denali, one of the Company’s principal stockholders. On March 31, 2021, the Company drew down an additional $250.0 million from the Company’s $600.0 million revolving credit facility. A lender under the revolving credit facility is an affiliate of KKR Denali, a principal stockholder of the Company. Following such draw down, the Company had an aggregate amount of $400.0 million outstanding under the revolving credit facility, which was repaid in full with the net proceeds from the IPO in April 2021. See Note 8. On May 6, 2020, the Company amended the Credit Agreement. See Note 8. In connection with this amendment, the Company paid $1.5 million in fees to KKR Capital Markets LLC, which is affiliated with KKR Denali, one of the Company’s principal stockholders. The Company had no other material related parties for the three and nine months ended September 30, 2020 and 2021.	18. Related Party KKR Capital Markets LLC, an affiliate of KKR Denali, acted as joint lead arranger and joint bookrunner for the Credit Agreement. KKR Denali is also one of the Company’s principal stockholders. In 2018, 2019 and 2020, the Company paid $6.5 million, $2.0 million and $1.5 million, respectively, in fees to KKR Capital Markets LLC in connection with the Credit Agreement. On November 30, 2020, the Company borrowed $150.0 million under the revolving credit facility at a margin of 2.50% (the “Revolving Credit Loan”). A lender of the Revolving Credit Loans is an affiliate of KKR Denali, a principal stockholder of the Company. In December 2019, the Company purchased 2,475,000 shares and 300,000 principal stockholder. The fair value of the purchased shares was $ million. The purchase of shares was paid through the issuance of two unsecured 5-year promissory notes with the principal amount of $ million and $ million, respectively. The promissory notes are redeemable upon the earlier of (i) maturity, (ii) immediately prior to an acquisition of the Company as defined in the Company’s 2011 S-1 with the Securities and Exchange Commission. The % per annum paid annually. Both promissory notes were recorded in other non-current million representing a discount of % to its principal amount and resulting in a u were added to the pool of shares available for the grant under the paid-in capital.

Subsequent Events

Subsequent Events	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	14. Subsequent Events In October 2021, the remaining 50% of the convertible security with a stated value of $20.0 million was converted into 324,156 shares of the Company’s Class A common stock at a conversion price of $61.7 per share. On October 6, 2021, the Company entered into a definitive agreement to acquire from Twitter, Inc. the MoPub business for approximately $1.05 billion in cash. The transaction is subject to customary closing conditions and is expected to close in 2022. On October 25, 2021, the Company amended the Credit Agreement to increase the senior secured term loan facility by an aggregate principal amount of $1.50 billion. In connection with this amendment, the Company paid $1.4 million in fees to KKR Capital Markets LLC, who is affiliated with KKR Denali, one of the Company’s principal stockholders. Due to the timing of these transactions, as of the date of issuance of these condensed consolidated financial statements, the Company is in the process of finalizing the valuation and related accounting for these transactions.	19. Subsequent Events The Company has evaluated subsequent events through March 2, 2021 In January 2021 the Company paid $60.0 million to Recoded in relation to a new game App acquired in 2020. In February 2021, the Company paid an additional $90.0 million to Recoded related to deferred cash consideration on the acquisition closed in 2019. In January, 2021, a new director was elected to serve on the Company’s board of directors and received options to purchase a total of 206,000 shares of the Company’s common stock under the Company’s 2011 Plan. With respect to 21,000 shares, 1/12th of the shares will vest, subject to such director’s continued role as a service provider to the Company, on April 21, 2021 with 1/12th of the shares vesting every three months thereafter; provided that 100% of any unvested shares covered by the option will vest immediately prior to the closing of an Acquisition or Other Combination (each as defined in the Company’s 2011 Plan). The options to purchase 185,000 shares were fully vested on the date of grant and such options were exercised in full in January 2021. In February 2021, the Company signed a share purchase agreement with Adjust GmbH, a leading mobile app attribution, measurement and analytics company in Germany, to acquire all the outstanding shares of Adjust GmbH for an estimated purchase price of $1.0 billion, consisting of (i) $598.0 million in cash, subject to certain purchase price adjustments, (ii) a number of shares of the Company’s Class A common stock determined by dividing $352.0 million by the 15-day In February 2021, the Company amended the Credit Agreement to increase the senior secured term loan facility by $300.0 million to an aggregate principal amount of $1.82 billion, to add an additional $10.0 million in aggregate principal amount of revolving commitments, increasing the total revolving commitments to $600.0 million and to reduce the interest rate on the incremental term loans issued on May 6, 2020 to have the same interest rate as all other term loans. In connection with this amendment, the Company paid $0.8 million in fees to KKR Capital Markets LLC, who is one of the Company’s principal stockholders. In February 2021 , promissory notes issued to executive officers in the amount of $20.9 million were settled through either share repurchase, in the amount of $17.2 million, or cash payment, in the amount of $3.7 million. In connection with the repurchase of shares, the Company accelerated vesting of 60,968 shares of Class A common stock for one of the Company’s officers. Due to the timing of these transactions, as of the date of issuance of these consolidated financial statements, the Company is in the process of finalizing the valuation and related accounting for these transactions.

Subsequent Events (Unaudited)

Subsequent Events (Unaudited)	12 Months Ended
	Dec. 31, 2020
Subsequent Event [Member]
Subsequent Event [Line Items]
Subsequent Events (Unaudited)	20. Subsequent Events (Unaudited) On March 14, 2021, the Company amended and restated its share purchase agreement with adjust On March 31, 2021, the Company drew down an additional $250.0 million from the Company’s $600.0 million revolving credit facility. A lender under the revolving credit facility is an affiliate of KKR Denali, a principal stockholder of the Company. Capital Structure Change Following the effectiveness of the registration statement on Form S-1 Upon the closing of the IPO, Adam Foroughi, the Company’s co-founder, The rights of the holders of Class A common stock, Class B common stock, and Class C common stock (referred to together as the “common stock”) will be identical, except with respect to voting and conversion. Voting Rights Holders of the Class A common stock will be entitled to one vote for each share held on all matters submitted to a vote of stockholders, holders of the Class B common stock will be entitled to 20 votes for each share held on all matters submitted to a vote of stockholders, and holders of the Class C common stock will not be entitled to vote on any matter that is submitted to a vote of stockholders, except as otherwise required by law. The holders of the Class A common stock and Class B common stock will vote together as a single class, unless otherwise required by law. Under the IPO Certificate, approval of the holders of at least a majority of the outstanding shares of the Class B common stock voting as a separate class will be required to increase the number of authorized shares of the Class B common stock. In addition, Delaware law could require either holders of the Class A common stock, the Class B common stock, or the Class C common stock to vote separately as a single class in the following circumstances: • if the Company were to seek to amend the IPO Certificate to increase or decrease the par value of a class of stock, then that class would be required to vote separately to approve the proposed amendment; and • if the Company were to seek to amend the IPO Certificate in a manner that alters or changes the powers, preferences or special rights of a class of stock in a manner that affected its holders adversely, then that class would be required to vote separately to approve the proposed amendment. Until the date on which the final conversion of all outstanding shares of Class B common stock pursuant to the terms of the IPO Certificate occurs, approval of at least two-thirds Dividend Rights Subject to preferences that may apply to any shares of preferred stock outstanding at the time, the holders of the Company’s common stock will be entitled to receive dividends out of funds legally available if the Company’s board of directors, in its discretion, determines to issue dividends and then only at the times and in the amounts that the Company’s board of directors may determine. No Preemptive or Similar Rights The Company’s common stock will not be entitled to preemptive rights, and is not subject to conversion, redemption or sinking fund provisions. Right to Receive Liquidation Distributions If the Company becomes subject to a liquidation, dissolution or winding-up, Conversion of Class B Common Stock Each share of Class B common stock will be convertible at any time at the option of the holder into one share of Class A common stock. Following the closing of the IPO, shares of Class B common stock will automatically convert into shares of Class A common stock upon sale or transfer except for certain transfers described in the IPO Certificate, including transfers for estate planning, transfers among KKR Denali and its affiliates, or other transfers among the Class B Stockholders. Withdrawal from the Voting Agreement constitutes a transfer. Each share of Class B common stock will convert automatically into one share of Class A common stock upon the date fixed by the Company’s board of directors that is no less than 61 days and no more than 180 days following the date on which (i) the Voting Agreement is terminated or (ii) Adam Foroughi is no longer involved with the Company as a member of the board of directors or as an executive officer. Conversion of Class C Common Stock After the conversion or exchange of all outstanding shares of the Company’s Class B common stock into shares of Class A common stock, all outstanding shares of Class C common stock will convert automatically into Class A common stock, on a share-for-share

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Principles of Consolidation		Principles of Consolidation
Reclassification		Reclassification
Use of Estimates		Use of Estimates and long-lived assets, goodwill impairment, and fair value of derivatives and other financial instruments among others. The Company bases its estimates on assumptions, both historical and forward-looking, that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities.
Risk and Uncertainties		Risk and Uncertainties COVID-19 COVID-19 COVID-19 in-app COVID-19 COVID-19
Revenue from Contracts with Customers	Revenue from Contracts with Customers The Company generates Business and Consumer revenue. Business Revenue includes fees paid by mobile app advertisers that use the Company’s software platform (“Software Platform”), and revenue generated from the sale of digital advertising inventory of the Company’s apps (“Apps”). Consumer Revenue consists of mobile in-app purchases Business Revenue The Software Platform provides the technology to match advertisers and third-party owners of digital advertising inventory (“Publishers”) via auctions at large scale and microsecond-level speeds. The pricing and terms for all mobile advertising arrangements are governed by the Company’s terms and conditions and generally stipulate payment terms of 30 days subsequent to the end of the month. The contract is fully cancellable at any time. For Business Revenue generated through placement of advertisements on mobile applications owned by Publishers, the Company’s performance obligation is to provide an advertiser with access to the Software Platform which facilitates the advertiser’s purchase of advertising inventory from Publishers. The Company does not control the advertising inventory prior to its transfer to the advertiser, the Company’s customer, because the Company does not have the substantive ability to direct the use of, nor obtain substantially all of the remaining benefits from the advertising inventory. The Company is not primarily responsible for fulfillment and does not have any inventory risk. The Company is an agent as it relates to the sale of third-party advertising inventory and presents revenue on a net basis. The transaction price is the product of either the number of completions of agreed upon actions or advertisements displayed and the contractually agreed upon price per advertising unit with the advertiser less consideration paid or payable to Publishers. Advertisers purchase Apps advertising inventory either through the Software Platform or through third-party advertising networks (“Ad Networks”). Revenue from the sale of advertising inventory through Ad Networks is recognized net of the amounts retained by Ad Networks as the Company is unable to determine the gross amount paid by the advertisers to Ad Networks. The Company recognizes mobile advertising revenue when the agreed upon action is completed or when the ad is displayed to users, depending on the agreed upon pricing mechanism with an advertiser Network number Consumer Revenue IAPs include fees collected from users for the purchase of virtual goods to enhance their gameplay experience. The identified performance obligation is to provide users with the ability to acquire, use, and hold virtual items over the estimated period of time the virtual items are available to the user or until the virtual item is consumed. The Company categorizes its virtual goods as either consumable or durable. Consumable virtual goods represent goods that can be consumed by a specific player action in gameplay; accordingly, the Company recognizes revenue from the sale of consumable virtual goods as the goods are consumed and the Company’s performance obligation is satisfied. Durable virtual goods represent goods that are accessible to the user over an extended period of time; accordingly, the Company recognizes revenue from the sale of durable virtual goods ratably over the period of time the goods are available to the user and the Company’s performance obligation is satisfied, which is generally the estimated average user life (“EAUL”). Payment is required at the time of purchase and the purchase price is a fixed amount. Users make IAPs through the Company’s distribution partners. The transaction price is equal to the gross amount charged to users because the Company is the principal in the transaction. IAPs fees are non-refundable. Such The EAUL represents the Company’s best estimate of the expected life of paying users for the applicable game. The EAUL begins when a user makes a first purchase of durable virtual goods and ends when a user is determined to be inactive. The Company determines the EAUL on a game-by-game basis. six The Company presents taxes collected from customers and remitted to governmental authorities on a net basis.	Revenue from Contracts with Customers in-app Business Revenue The Software Platform provides the technology to match advertisers and third-party owners of digital advertising inventory (“Publishers”) via auctions at large scale and microsecond-level speeds. The pricing and terms for all mobile advertising arrangements are governed by the Company’s terms and conditions and generally stipulate payment terms of 30 days subsequent to the end of the month. The contract is fully cancellable at any time. For Business Revenue generated through placement of advertisements on mobile applications owned by Publishers, the Company’s performance obligation is to provide an advertiser with access to the Software Platform which facilitates the advertiser’s purchase of advertising inventory from Publishers. The Company does not control the advertising inventory prior to its transfer to the advertiser, the Company’s customer, because the Company does not have the substantive ability to direct the use of, nor obtain substantially all of the remaining benefits from the advertising inventory. The Company is not primarily responsible for fulfillment and does not have any inventory risk. The Company is an agent as it relates to the sale of third-party advertising inventory and presents revenue on a net basis. The transaction price is the product of either the number of completions of agreed upon actions or advertisements displayed and the contractually agreed upon price per advertising unit with the advertiser less consideration paid or payable to Publishers. Advertisers purchase Apps advertising inventory either through the Software Platform or through third-party advertising networks (“Ad Networks”). Revenue from the sale of advertising inventory through Ad Networks is recognized net of the amounts retained by Ad Networks as the Company is unable to determine the gross amount paid by the advertisers to Ad Networks. The Company recognizes mobile advertising revenue when the agreed upon action is completed or when the ad is displayed to users, depending on the agreed upon pricing mechanism with an advertiser or Ad Network. The number of advertisements delivered and completions of agreed upon actions is determined at the end of each month, which resolves any uncertainty in the transaction price during the reporting period. Consumer Revenue IAPs include fees collected from users for the purchase of virtual goods to enhance their gameplay experience. The identified performance obligation is to provide users with the ability to acquire, use, and hold virtual items over the estimated period of time the virtual items are available to the user or until the virtual item is consumed. The Company categorizes its virtual goods as either consumable or durable. Consumable virtual goods represent goods that can be consumed by a specific player action in gameplay; accordingly, the Company recognizes revenue from the sale of consumable virtual goods as the goods are consumed and the Company’s performance obligation is satisfied. Durable virtual goods represent goods that are accessible to the user over an extended period of time; accordingly, the Company recognizes revenue from the sale of durable virtual goods ratably over the period of time the goods are available to the user and the Company’s performance obligation is satisfied, which is generally the estimated average user life (“EAUL”). Payment is required at the time of purchase and the purchase price is a fixed amount. Users make IAPs through the Company’s distribution partners. The transaction price is equal to the gross amount charged to users because the Company is the principal in the transaction. IAPs fees are non-refundable. The EAUL represents the Company’s best estimate of the expected life of paying users for the applicable game. The EAUL begins when a user makes a first purchase of durable virtual goods and ends when a user is determined to be inactive. The Company determines the EAUL on a game-by-game The Company presents taxes collected from customers and remitted to governmental authorities on a net basis. Disaggregation of Revenue The following table present revenue disaggregated by type (in thousands): Year Ended December 31, 2018 2019 2020 Business Revenue—Apps $ 166,259 $ 397,643 $ 503,867 Consumer Revenue—Software Platform 262,997 198,305 207,285 Total Business Revenue 429,256 595,948 711,152 Consumer Revenue 54,107 398,156 739,934 Total Revenue $ 483,363 $ 994,104 $ 1,451,086 Revenue disaggregated by geography, based on user location, consists of the following (in thousands): Year Ended December 31, 2018 2019 2020 United States $ 261,734 $ 622,051 $ 895,987 United Kingdom $ 47,982 60,073 78,681 Rest of the World $ 173,647 311,980 476,418 Total Revenue $ 483,363 $ 994,104 $ 1,451,086
Fair Value of Financial Instruments		Fair Value of Financial Instruments non-recurring Level 1 Level 2 Level 3
Derivatives		Derivatives .
Accounts Receivable, net		Accounts Receivable, net
Net Income (Loss) Per Share Attributable to Common Stockholders		Net Income (Loss) Per Share Attributable to Common Stockholders two-class two-class
Noncontrolling Interests and Redeemable Noncontrolling Interests		Noncontrolling Interests and Redeemable Noncontrolling Interests L
Cash and Cash Equivalents		Cash and Cash Equivalents
Concentration of Credit Risk and Uncertainties		Concentration of Credit Risk and Uncertainties The Company’s accounts receivable balance is derived from both domestic and international sales. The Company reviews its exposure to accounts receivable credit risk and generally requires no collateral for its accounts receivable. The Company uses various distribution partners to collect and remit payments from users of Apps for virtual goods. As of December 31, 2019, one distribution partner accounted for 12% of the accounts receivable, net. As of December 31, 2020, two distribution partners accounted for 20% and 13% of the accounts receivable, net. No individual customer accounted for 10% or more of the Company’s accounts receivable or revenue during the years ended December 31, 2019 and 2020.
Property and Equipment, net		Property and Equipment, net Useful Life Computer equipment 3 5 Software and licenses 3 years Furniture and fixtures 3 - 5 years Leasehold improvements Over the shorter of useful life (up to 10 years) or lease term When assets are retired or otherwise disposed of, the cost and accumulated depreciation and amortization are removed from the accounts and any resulting gain or loss is reflected in operations in the period realized. Maintenance and repairs are charged to operations as incurred.
Deferred Offering Costs		Deferred Offering Costs
Segment Reporting		Segment Reporting
Asset Acquisitions and Business Combinations	Asset Acquisitions and Business Combinations The Company performs an initial test to determine whether substantially all of the fair value of the gross assets transferred are concentrated in a single identifiable asset or a group of similar identifiable assets, such that the acquisition would not represent a business. If that test suggests that the set of assets and activities is a business, the Company then performs a second test to evaluate whether the assets and activities transferred include inputs and substantive processes that together, significantly contribute to the ability to create outputs, which would constitute a business. If the result of the second test suggests that the acquired assets and activities constitute a business, the Company accounts for the transaction as a business combination. For transactions accounted for as business combinations, the Company allocates the fair value of acquisition consideration to the tangible assets acquired, liabilities assumed, and intangible assets acquired based on their estimated fair values. Acquisition consideration includes the fair value of any promised contingent consideration. The excess of the fair value of acquisition consideration over the fair value of acquired identifiable assets and liabilities is recorded as goodwill. Contingent consideration is remeasured to its fair value each reporting period with changes in the fair value of contingent consideration recorded in general and administrative expenses. Such valuations require management to make significant estimates and assumptions, especially with respect to intangible assets. Management’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable, and as a result, actual results may differ from estimates. In certain circumstances, the allocations of the excess purchase price are based upon preliminary estimates and assumptions and subject to revision when the Company receives final information, including appraisals and other analyses. During the measurement period, which is one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period, any subsequent adjustments are recorded to earnings. Acquisition-related costs are expensed as incurred. For transactions accounted for as asset acquisitions, the cost, including certain transaction costs, is allocated to the assets acquired on the basis of relative fair values. The Company generally includes contingent consideration in the cost of the assets acquired only when the uncertainty is resolved. The Company recognizes contingent consideration adjustments to the cost of the acquired assets prospectively using the straight-line method over the remaining useful life of the assets. No goodwill is recognized in asset acquisitions.	Asset Acquisitions and Business Combinations For transactions accounted for as business combinations, the Company allocates the fair value of acquisition consideration to the tangible assets acquired, liabilities assumed, and intangible assets acquired based on their estimated fair values. Acquisition consideration includes the fair value of any promised contingent consideration. The excess of the fair value of acquisition consideration over the fair value of acquired identifiable assets and liabilities is recorded as goodwill. Contingent consideration is remeasured to its fair value each reporting period with changes in the fair value of contingent consideration recorded in general and administrative expenses. Such valuations require management to make significant estimates and assumptions, especially with respect to intangible assets. Management’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable, and as a result, actual results may differ from estimates. In certain circumstances, the allocations of the excess purchase price are based upon preliminary estimates and assumptions and subject to revision when the Company receives final information, including appraisals and other analyses. During the measurement period, which is one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period, any subsequent adjustments are recorded to earnings. Acquisition-related costs are expensed as incurred. For transactions accounted for as asset acquisitions, the cost, including certain transaction costs, is allocated to the assets acquired on the basis of relative fair values. The Company generally includes contingent consideration in the cost of the assets acquired only when the uncertainty is resolved. The Company recognizes contingent consideration adjustments to the cost of the acquired assets prospectively using the straight-line method over the remaining useful life of the assets. No goodwill is recognized in asset acquisitions.
Services and Development Agreements	Services and Development Agreements The Company enters into strategic agreements with mobile gaming studios (“Partner Studios”). The Company has historically allowed these Partner Studios to continue their operations with a significant degree of autonomy. In some cases, the Company bought Apps from Partner Studios and entered into service and development agreements whereby Partner Studios provide support in improving existing Apps and developing new Apps. The substantial majority of payments associated with service agreements for existing Apps are expensed to research and development when the services are rendered as the payments primarily relate to developing enhancements for the Apps. Payments for new Apps associated with development agreements are generally made in connection with the development of a particular App, and therefore, the Company is subject to development risk prior to the release of the App. Accordingly, payments that are due prior to completion of an App are generally expensed to research and development over the development period as the services are incurred. Payments due after completion of an App are generally capitalized and expensed as cost of revenue. See Note 6, “Acquisitions” for additional information.	Services and Development Agreements
Software Development Costs		Software Development Costs internal-use
Goodwill		Goodwill reporting unit is recorded as an impairment to goodwill. As of December 31, 2018, 2019 and 2020, no impairment of goodwill has been identified.
Intangible Assets		Intangible Assets Intangible assets also include costs of intellectual property that the Company licenses from third parties for use of their content in the Company’s game. The licensing agreements include license payments, which are due over the terms of the agreements. The Company recognizes these license payments as a license asset and a license obligation at the fair value on the contract date, based on a discounted cash flow model. The amortization of the licensed asset commences when the game with licensed content is launched and when licensed agreement is executed and is recorded in cost of revenue on a straight-line method over the remaining license terms or estimated useful life of the game with licensed content, whichever is shorter. The classification of the license obligations between current and long-term is based on the expected timing of the payments to the licensor.
Impairment of Long-Lived Assets		Impairment of Long-Lived Assets
Cost of Revenue		Cost of Revenue co-located
Sales and Marketing		Sales and Marketing included in sales and marketing expenses. Costs for advertising are expensed as incurred. Advertising costs, which consist primarily of user acquisition costs, totaled $143.9 million, $436.1 million and $550.9 million for the years ended December 31, 2018, 2019 and 2020, respectively.
Research and Development		Research and Development
General and Administrative		General and Administrative
Stock-Based Compensation		Stock-Based Compensation non-employee
Income Taxes		Income Taxes The Company recognizes deferred tax assets to the extent that these assets are more likely than not to be realized. In making such a determination, the Company considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning The Company records uncertain tax positions on the basis of a two-step more-likely-than-not The Company recognizes interest and penalties related to unrecognized tax benefits on the income tax expense line in the accompanying consolidated statements of operations. Accrued interest and penalties are included on the related tax liability line in the consolidated balance sheets. (Topic 815), In August 2020, the FASB issued ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) 815-40):
Recent Accounting Pronouncements (Issued and Not Yet Adopted)	Recent Accounting Pronouncements (Issued and Not Yet Adopted) In August 2020, the FASB issued ASU 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity 2021-04, Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Option.	Recent Accounting Pronouncements (Issued and Not Yet Adopted) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.
Recent Accounting Pronouncements	Recent Accounting Pronouncements (Issued and Adopted) In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes. In January 2020, the FASB issued ASU 2020-01, Clarifying the Interactions between Investments—Equity Securities, Investments—Equity Method and Joint Ventures, and Derivatives and Hedging.	Recent Accounting Pronouncements (Issued and Adopted) No. 2016-02, Leases (Topic 842) No. 2018-11, Targeted Improvements—Leases (Topic 842) right-of-use non-current, In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805) Clarifying the Definition of a Business, In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment 2017-04 In August 2017, the FASB issued ASU 2017-12 Derivatives and Hedging (Topic 815) Targeted Improvements to Accounting for Hedging Activities those risk management activities; and reduces the complexity of and simplifies the application of hedge accounting by preparers. This standard is effective for interim and annual reporting periods beginning after December 15, 2018. The Company adopted the standard on January 1, 2019 with no material financial statement impact upon adoption. In June 2018, the FASB issued ASU 2018-07, Compensation-Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting Compensation—Stock Compensation 2018-07 In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments 2016-13 In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement 2018-13 In March 2020, the FASB issued ASU No. 2020-04, Facilitation of the Effects of Reference Rate Reform on Financial Reporting (Topic 848) No. 2021-01, No. 2020-04 No. 2020-04.
Foreign Currency Transactions		Foreign Currency Transactions
Comprehensive Income, Policy [Policy Text Block]		Comprehensive Income (Loss)

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Summary of revenue disaggregated by type	The following table presents revenue disaggregated by type (in thousands): Three Months Ended Nine Months Ended 2020 2021 2020 2021 Business Revenue—Apps $ 132,583 $ 156,208 $ 327,915 $ 475,394 Business Revenue—Software Platform 39,841 193,307 127,262 427,390 Total Business Revenue 172,424 349,515 455,177 902,784 Consumer Revenue 209,316 377,436 486,072 1,096,850 Total Revenue $ 381,740 $ 726,951 $ 941,249 $ 1,999,634	The following table present revenue disaggregated by type (in thousands): Year Ended December 31, 2018 2019 2020 Business Revenue—Apps $ 166,259 $ 397,643 $ 503,867 Consumer Revenue—Software Platform 262,997 198,305 207,285 Total Business Revenue 429,256 595,948 711,152 Consumer Revenue 54,107 398,156 739,934 Total Revenue $ 483,363 $ 994,104 $ 1,451,086
Summary of revenue disaggregated by geography	Revenue disaggregated by geography, based on user location, consists of the following (in thousands): Three Months Ended Nine Months Ended 2020 2021 2020 2021 United States 234,430 437,501 586,330 1,209,846 Rest of the World 147,310 289,450 354,919 789,788 Total Revenue $ 381,740 $ 726,951 $ 941,249 $ 1,999,634	Revenue disaggregated by geography, based on user location, consists of the following (in thousands): Year Ended December 31, 2018 2019 2020 United States $ 261,734 $ 622,051 $ 895,987 United Kingdom $ 47,982 60,073 78,681 Rest of the World $ 173,647 311,980 476,418 Total Revenue $ 483,363 $ 994,104 $ 1,451,086
Schedule of Estimated Ueful Life of Property Plant And Equipment		Useful Life Computer equipment 3 5 Software and licenses 3 years Furniture and fixtures 3 - 5 years Leasehold improvements Over the shorter of useful life (up to 10 years) or lease term

Revenue (Tables)

Revenue (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Summary of Revenue Disaggregated by Type	The following table presents revenue disaggregated by type (in thousands): Three Months Ended Nine Months Ended 2020 2021 2020 2021 Business Revenue—Apps $ 132,583 $ 156,208 $ 327,915 $ 475,394 Business Revenue—Software Platform 39,841 193,307 127,262 427,390 Total Business Revenue 172,424 349,515 455,177 902,784 Consumer Revenue 209,316 377,436 486,072 1,096,850 Total Revenue $ 381,740 $ 726,951 $ 941,249 $ 1,999,634	The following table present revenue disaggregated by type (in thousands): Year Ended December 31, 2018 2019 2020 Business Revenue—Apps $ 166,259 $ 397,643 $ 503,867 Consumer Revenue—Software Platform 262,997 198,305 207,285 Total Business Revenue 429,256 595,948 711,152 Consumer Revenue 54,107 398,156 739,934 Total Revenue $ 483,363 $ 994,104 $ 1,451,086
Summary of Revenue Disaggregated by Geography	Revenue disaggregated by geography, based on user location, consists of the following (in thousands): Three Months Ended Nine Months Ended 2020 2021 2020 2021 United States 234,430 437,501 586,330 1,209,846 Rest of the World 147,310 289,450 354,919 789,788 Total Revenue $ 381,740 $ 726,951 $ 941,249 $ 1,999,634	Revenue disaggregated by geography, based on user location, consists of the following (in thousands): Year Ended December 31, 2018 2019 2020 United States $ 261,734 $ 622,051 $ 895,987 United Kingdom $ 47,982 60,073 78,681 Rest of the World $ 173,647 311,980 476,418 Total Revenue $ 483,363 $ 994,104 $ 1,451,086

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Summary of company's financial instruments that were measured at fair value by level within the fair value hierarchy on a recurring basis	The following table sets forth the Company’s financial instruments that were measured at fair value by level within the fair value hierarchy on a recurring basis as of the dates indicated (in thousands): As of December 31, 2020 Balance Sheet Location Total Level 1 Level 2 Level 3 Financial Assets: Money market funds Cash and cash $ 6,413 $ 6,413 $ — $ — Embedded derivative Long-term debt 5,680 — — 5,680 Total financial assets $ 12,093 $ 6,413 $ — $ 5,680 Financial Liability: Convertible security Deferred $ 46,500 $ — $ — $ 46,500 As of September 30, 2021 Balance Sheet Location Total Level 1 Level 2 Level 3 Financial Assets: Money market funds Cash and cash $ 820,594 $ 820,594 $ — $ — Marketable equity securities Prepaid expenses and 5,165 5,165 Total financial assets $ 825,759 $ 825,759 $ — $ — Financial Liability: Convertible security Deferred acquisition $ 25,000 $ 25,000 $ — $ —	The following table sets forth the Company’s financial instruments that were measured at fair value by level within the fair value hierarchy on a recurring basis as of the dates indicated (in thousands): As of December 31, 2019 Balance Sheet Location Total Level 1 Level 2 Level 3 Financial Asset: Money market funds Cash and cash equivalents $ 340,532 $ 340,532 $ — $ — Financial Liability: Interest rate swap Accrued liabilities $ 5,336 $ — $ 5,336 $ — As of December 31, 2020 Balance Sheet Location Total Level 1 Level 2 Level 3 Financial Assets: Money market funds Cash and cash equivalents $ 6,413 $ 6,413 $ — $ — Embedded derivative Long-term debt 5,680 — — 5,680 Total financial assets $ 12,093 $ 6,413 $ — $ 5,680 Financial Liability: Convertible security Deferred acquisition costs, current $ 46,500 $ — $ — $ 46,500
Summary of reconciliation of the Company's financial asset and liability measured at fair value	The following table presents a reconciliation of the Company’s financial asset and liability measured at fair value as of September 30, 2021 using significant unobservable inputs (Level 3), and the change in fair value (in thousands): Embedded Convertible Balance as of December 31, 2020 $ 5,680 $ 46,500 Addition related to the issuance of term loans in February 2021 5,630 — Extinguishment of term loans in February 2021 (1,130 ) — Change in fair value recognized in earnings 7,640 3,500 Settlements (17,820 ) (25,000 ) Transfers — (25,000 ) Balance as of September 30, 2021 $ — $ —	The following table presents a reconciliation of the Company’s financial asset and liability measured at fair value as of December 31, 2020 using significant unobservable inputs (Level 3), and the change in fair value (in thousands): Embedded Derivative Convertible Security Balance as of December 31, 2019 $ — $ — Initial fair value recognition — 45,000 Change in fair value recognized in earnings 5,680 1,500 Balance as of December 31, 2020 $ 5,680 $ 46,500

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Schedule Of Property Plant And Equipment Table	Property and equipment, net consists of the following (in thousands): December 31, 2019 2020 Computer equipment $ 29,505 $ 33,977 Leasehold improvements 421 18,176 Software and licenses 2,994 3,191 Furniture and fixtures 333 2,824 Total property and equipment 33,253 58,168 Less: accumulated depreciation (25,352 ) (29,581 ) Total property and equipment, net $ 7,901 $ 28,587

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Loss Contingencies by Contingency	Future minimum payments under these non-cancelable 2021 $ 16,389 2022 27,436 2023 28,423 2024 31,000 2025 33,000 Total non-cancelable $ 136,248

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Summary of the fair value of identifiable assets acquired and liabilities assumed	The following table summarizes the preliminary allocation of the purchase consideration to the fair value of the assets acquired and liabilities assumed (in thousands): Cash and cash equivalents $ 12,155 Accounts receivable and other current assets 21,840 Intangible assets Customer Relationships—estimated useful life of 12 years 155,000 Developed Technology—estimated useful life of 6 years 77,000 Tradename—estimated useful life of 5 years 8,000 Goodwill 776,147 Operating lease right-of-use 8,130 Property and equipment, net 1,897 Finance lease right-of-use 43,156 Other assets 3,191 Accounts payable, accrued liabilities and other current liabilities (15,540 ) Deferred revenue (5,600 ) Operating lease liabilities (8,130 ) Finance lease liabilities (43,156 ) Deferred income tax liability (66,273 ) Total purchase consideration $ 967,817 The following table summarizes the fair value of identifiable assets acquired and liabilities assumed (in thousands): Cash $ 1,043 Accounts receivable and other current assets 1,457 Intangible assets Apps—estimated useful life of 5 years 17,040 Tradename—estimated useful life of 5 years 260 Developed Technology—estimated useful life of 2 years 590 Property, equipment and other tangible asset s 369 Goodwill 9,805 Accounts payable, accrued liabilities and other liabilities (4,935 ) Total purchase consideration $ 25,629 The following table summarizes the fair value of identifiable assets acquired and liabilities assumed (in thousands): Cash $ 2,787 Accounts receivable, net 1,850 Intangible assets Apps—estimated useful life of 5 years 44,000 Tradename—estimated useful life of 5 years 900 Goodwill 20,198 Other tangible assets 131 Accounts payable (2,492 ) Other liabilities (11,142 ) Total valuation 56,232 Redeemable noncontrolling interes t (2,556 ) Total purchase consideration $ 53,676 The following table summarizes the fair value of identifiable assets acquired and liabilities assumed (in thousands): Cash $ 37,767 Accounts receivable and other current assets 27,284 Intangible assets Tradename—estimated useful life of 10 years 13,000 Apps—estimated useful life of 3—5 years 272,000 Intellectual property license—useful life of 2 years 28,551 Goodwill 82,353 Right-of-use 125,639 Property, equipment and other tangible assets 42,312 Accounts payable, accrued liabilities and other liabilitie s (81,591 ) Deferred revenue (43,200 ) License obligation (35,685 ) Operating lease liabilities (139,875 ) Total purchase consideration $ 328,555	The following table summarizes the allocation of the purchase price and the identifiable assets acquired as of the amendment date (in thousands): Cash $ 714 Accounts receivable 6,398 Prepaid expenses and other current assets 121 Intangible assets: Tradename—estimated useful life of 5 years 230 Games—estimated useful life of 3 years 10,220 User install base—estimated useful life of 3 months 400 Goodwill 61,790 Property and equipment 42 Other assets 17 Accounts payable (2,947 ) Accrued expenses (3,049 ) Total purchase price $ 73,936 Contingent consideration (52,429 ) Cash consideration $ 21,507 The following table summarizes the allocation of the purchase price and the identifiable assets acquired as of the closing date (in thousands): Cash $ 1,093 Accounts receivable 52 Prepaid expenses and other current assets 11 Intangible assets: Developed technology—estimated useful life of 3 years 3,200 Goodwill 30,038 Property and equipment 32 Other assets 334 Accounts payable (2,124 ) Other current liabilities (1 ) Total purchase price $ 32,635 Issuance of common stock (735 ) Cash consideration $ 31,900 The following table summarizes the fair value of identifiable assets acquired and liabilities assumed (in thousands): Cash $ 1,043 Accounts receivable and other current assets 1,457 Intangible assets Apps—estimated useful life of 5 years 17,040 Tradename—estimated useful life of 5 years 260 Developed Technology—estimated useful life of 2 years 590 Property, equipment and other tangible assets 369 Goodwill 9,805 Accounts payable, accrued liabilities and other liabilities (4,935 ) Total purchase consideration $ 25,629 The following table summarizes the fair value of identifiable assets acquired and liabilities assumed (in thousands): Cash $ 2,787 Accounts receivable, net 1,850 Intangible Assets Apps—estimated useful life of 5 years 44,000 Tradename—estimated useful life of 5 years 900 Goodwill 20,198 Other tangible assets 131 Accounts payable (2,492 ) Other liabilitie s (11,142 ) Total valuation 56,232 Redeemable noncontrolling interest (2,556 ) Total purchase consideration $ 53,676 The following table summarizes the fair value of identifiable assets acquired and liabilities assumed (in thousands): Cash $ 37,767 Accounts receivable and other current assets 27,284 Intangible assets Tradename—estimated useful life of 10 years 13,000 Apps—estimated useful life of 3—5 years 272,000 IP license—useful life of 2 years 28,551 Goodwill 82,353 Right-of-use assets under operating leases 125,639 Property, equipment and other tangible assets 42,312 Accounts payable, accrued liabilities and other liabilitie s (81,591 ) Deferred revenue (43,200 ) License obligations (35,685 ) Operating lease liabilities (139,875 ) Total purchase consideration $ 328,555
Supplemental Pro Forma Information	The unaudited supplemental pro forma information below presents the combined historical results of operations of the Company, Machine Zone and Adjust for each of the periods presented as if Adjust had been acquired as of January 1, 2020 and Machine Zone had been acquired as of January 1, 2019 (in thousands): Three Months Ended Nine Months Ended 2020 2021 2020 2021 Revenue $ 429,062 $ 727,633 $ 1,156,144 $ 2,034,908 Net income (loss) (102,917 ) (51 ) (230,779 ) 3,963 The unaudited supplemental pro forma information above include the following adjustments to net income (loss) in the appropriate pro forma periods (in thousands): Three Months Ended Nine Months Ended 2020 2021 2020 2021 An (increase) in amortization expense related to the fair value of acquired identifiable intangible assets, net of the amortization expense already reflected in actual historical result s $ (5,934 ) $ — $ (42,058 ) $ (7,325 ) A net increase in revenue related to fair value adjustment 22,542 682 31,584 1,219 A decrease (increase) in expenses related to transaction expenses — — (2,617 ) 14,115 An decrease (increase) in interest expense related to new debt financing, net of interest expense related to pre-existing (2,652 ) — 97,107 (2,640 ) A (decrease) in other income—liability classified warrants — — (1,730 ) — An (increase) in tax provision (3,201 ) (156 ) (18,877 ) (1,232 )	The following table includes unaudited pro forma results (in thousands, except per share data): Year Ended December 31, 2019 2020 Revenue $ 1,332,476 $ 1,625,476 Net (loss) (105,353 ) (179,415 ) Net (loss) per share — basic and diluted $ (0.50 ) $ (0.83 )

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, Net (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Goodwill Activity	The following table presents goodwill activity (in thousands): December 31, 2020 $ 249,773 Goodwill acquired 776,147 Foreign currency translation (28,259 ) September 30, 2021 $ 997,661	The following table presents goodwill activity (in thousands): December 31, 2018 $ 98,645 Goodwill acquired 38,515 Foreign currency translation (39 ) December 31, 2019 $ 137,121 Goodwill acquired 112,356 Foreign currency translation 296 December 31, 2020 $ 249,773
Summary of Intangible Assets Acquired Net	Intangible assets, net consisted of the following (in thousands): Weighted- Average Remaining Useful Life (Years) As of December 31, 2020 As of September 30, 2021 Gross Carrying Value Accumulated Amortization Net Book Value Gross Carrying Value Accumulated Amortization Net Book Value Long-lived intangible assets: Apps 4.9 $ 1,222,417 $ (232,832 ) $ 989,585 $ 1,905,750 $ (439,885 ) $ 1,465,865 Customer Relationships 11.6 — — — 149,389 (5,533 ) 143,856 User base 4.5 68,817 (17,617 ) 51,200 68,817 (24,931 ) 43,886 License asset 0.2 28,551 (10,918 ) 17,633 28,551 (24,107 ) 4,444 Developed technology 5.4 14,946 (8,489 ) 6,457 89,532 (17,645 ) 71,887 Other 6.3 23,321 (1,864 ) 21,457 33,868 (5,010 ) 28,858 Total long-lived intangible assets 1,358,052 (271,720 ) 1,086,332 2,275,907 (517,111 ) 1,758,796 Short-lived intangible assets: Apps 0.4 29,869 (25,599 ) 4,270 38,779 (36,886 ) 1,893 Total intangible assets $ 1,387,921 $ (297,319 ) $ 1,090,602 $ 2,314,686 $ (553,997 ) $ 1,760,689	Acquired intangible assets, net consisted of the following (in thousands): Weighted- Remaining As of December 31, 2019 As of December 31, 2020 Gross Accumulated Amortization Net Book Gross Accumulated Amortization Net Book Value Long-lived intangible assets: Apps 4.3 $ 433,805 $ (65,838 ) $ 367,967 $ 1,222,417 $ (232,832 ) $ 989,585 User base 5.3 68,817 (7,638 ) 61,179 68,817 (17,617 ) 51,200 License asset 0.8 — — — 28,551 (10,918 ) 17,633 Developed technology 1.4 14,356 (3,224 ) 11,132 14,946 (8,489 ) 6,457 Other 7.5 804 (177 ) 627 23,321 (1,864 ) 21,457 Total long-lived intangible assets 517,782 (76,877 ) 440,905 1,358,052 (271,720 ) 1,086,332 Short-lived intangible assets: Apps 0.5 15,511 (13,086 ) 2,425 29,869 (25,599 ) 4,270 Total intangible assets $ 533,293 $ (89,963 ) $ 443,330 $ 1,387,921 $ (297,319 ) $ 1,090,602
Summary of Finite-Lived Intangible Assets, Amortization Expense	The Company recorded amortization expenses related to acquired intangible assets as follows (in thousands): Three Months Ended Nine Months Ended 2020 2021 2020 2021 Cost of revenue $ 65,535 $ 96,059 $ 137,673 $ 273,444 Sales and marketing 3,050 6,765 8,470 16,008 Total $ 68,585 $ 102,824 $ 146,143 $ 289,452	The Company recorded amortization expenses related to acquired intangible assets as follows (in thousands): Year Ended December 31, 2018 2019 2020 Cost of revenue $ 7,932 $ 74,787 $ 228,339 Sales and marketing 495 7,641 11,587 Total $ 8,427 $ 82,428 $ 239,926
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]		As of December 31, 2020, the expected future amortization expense related to acquired intangible assets is estimated as follows (in thousands): 2021 $ 270,818 2022 246,333 2023 244,396 2024 244,396 2025 75,036 Thereafter 9,623 Total $ 1,090,602

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Lessee Disclosure [Abstract]
Summary of Operating Lease Asstes and Liabilites	The table below presents the operating lease-related assets and liabilities (in thousands): Year Ended 2019 2020 Balance Sheet Classification Operating lease right-of-use $ 14,895 $ 84,336 Operating lease right-of-use Current operating lease liabilities $ 2,510 $ 22,206 Operating lease liabilities Non-current $ 12,745 $ 71,755 Operating lease liabilities, non-current Weighted-average remaining term (years) 5.0 3.7 Weighted-average discount rate 6.0 % 4.7 %
Summary of Lease, Cost	The table below presents certain information related to the lease costs for operating leases which are allocated to cost of revenue, sales and marketing, research and development, and general and administrative expenses (in thousands): Year Ended December 31, 2018 2019 2020 Operating lease cost $ 2,784 $ 3,520 $ 17,372 Short-term lease cost 3,559 3,231 8,196 Variable lease cost 276 479 2,147 Total lease cost $ 6,619 $ 7,230 $ 27,715
Summary of Finance Lease Asstes and Liabilites	The table below presents the finance lease-related assets and liabilities (in thousands): Year Ended December 31, 2019 2020 Balance Sheet Classification Finance lease right-of-use $ 2,343 $ 5,067 Property and equipment, net Current finance lease liabilities $ 1,387 $ 2,821 Accrued liabilities Non-current $ 940 $ 2,340 Other non-current Weighted-average remaining term (years) 0.49 0.61 Weighted-average discount rate 6.0 % 6.0 %
Summary of operating sublease	or the year ended December 31, 2020, we have the following operating sublease information (in thousands): Year Ended Fixed sublease expense $ 5,769 Variable sublease expense 836 Sublease income (5,678 ) Variable sublease income (836 ) Net Loss $ 91
Summary of Lease Liability Maturity	Undiscounted cash flow As of December 31, 2020 Operating Networking Total 2021 $ 26,123 $ 3,581 $ 29,704 2022 17,874 2,015 19,889 2023 12,279 596 12,875 2024 12,288 — 12,288 2025 12,601 — 12,601 Thereafter 29,783 — 29,783 Total lease payments 110,948 6,192 117,140 Less: amount representing interest 16,987 1,031 18,018 Present value of future lease payments 93,961 5,161 99,122 Less: current obligations under leases 22,206 2,821 25,027 Non-current $ 71,755 $ 2,340 $ 74,095

Credit Agreement (Tables)

Credit Agreement (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Credit Agreement Summary of future maturities of long-term debt	The aggregate future maturities of long-term debt as of December 31, 2020 are as follows (in thousands): 2021 $ 15,210 2022 15,210 2023 15,210 2024 15,210 2025 1,583,492 Total outstanding term loan principal 1,644,332 Embedded derivative (5,680 ) Unaccreted discount and debt issuance costs (39,452 ) Total debt 1,599,200 Less: short-term debt 15,210 Long-term debt $ 1,583,990

Common Stock (Tables)

Common Stock (Tables)	12 Months Ended
	Dec. 31, 2020
Common Stock [Abstract]
Summary of Common Stock and Reserved for Future Issuance	The number of common stock shares authorized, issued, outstanding and reserved for future issuance as of December 31, 2020 are as follows: Shares Issued and Options Common Stock A 386,400,000 183,800,251 202,599,749 Common Stock F 43,200,000 42,564,150 635,850 Total shares of Common Stock 429,600,000 226,364,401 203,235,599

Stock-based Compensation (Table

Stock-based Compensation (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Summary of Stock-based Payment Arrangement Expenses	The Company recognized stock-based compensation expense for the periods indicated as follows (in thousands): Three Months Ended Nine Months Ended 2020 2021 2020 2021 Cost of revenue $ 126 $ 922 $ 204 $ 1,504 Sales and marketing 1,571 4,774 2,812 8,814 Research and development 6,823 20,110 10,692 40,148 General and administrative 2,348 8,919 5,654 41,362 Total $ 10,868 $ 34,725 $ 19,362 $ 91,828	The Company recognized stock-based compensation expense for the periods indicated as follows (in thousands): 2018 2019 2020 Cost of revenue $ 517 $ 124 $ 982 Sales and marketing 2,582 1,922 10,668 Research and development 1,009 5,009 36,852 General and administrative 1,357 3,167 13,885 Total stock-based compensation expense $ 5,465 $ 10,222 $ 62,387
Summary Of Weighted Average Assumptions Used To Estimate The Fair Value Of Options Granted		The weighted-average assumptions used to estimate the fair va l Year Ended 2018 2019 2020 Weighted-average expected term 6.00 6.05 5.94 Expected volatility 62 % 43 % 39 % Risk-free interest rate 2.58 % 1.91 % 0.56 % Dividend yield 0 % 0 % 0 %
Summary Of Stock Options Activity Under The Plan		The Company’s activity of the stock options under the Plan for the years ended December 31, 2019 and 2020 was as follows: Number of Weighted Weighted Balances at December 31, 2018 8,370,552 $ 2.66 9.2 Granted 12,199,200 4.36 Exercised (1,011,873 ) 2.61 Forfeited (1,158,528 ) 2.82 Expired (4,221 ) 2.81 Balances at December 31, 2019 18,395,130 $ 3.78 9.2 Granted 13,158,430 8.41 Exercised (871,668 ) 2.65 Forfeited (425,001 ) 1.68 Expired (1,367,367 ) 4.64 Balances at December 31, 2020 28,889,524 $ 5.92 8.8 Vested and exercisable at December 31, 2020 17,099,956 $ 5.26 8.6 Vested and expected to vest at December 31, 2020 25,023,502 $ 6.22 8.9
Summary Of Oustanding Restricted Stock Awards Activity		The Company’s activity of the outstanding restricted stock awards for Cla s , Number of Weighted Balances at December 31, 2018 3,664,653 $ 1.68 Granted 3,267,792 1.97 Repurchased (59,637 ) 1.68 Vested (2,948,394 ) 1.83 Balances at December 31, 2019 3,924,414 $ 1.81 Granted — — Repurchased — — Vested (2,687,643 ) 1.85 Balances at December 31, 2020 1,236,771 $ 1.71

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Summary of Basic and Diluted Net Income (Loss) Per Share Attributable to Common Stockholders	The following table sets forth the computation of basic and diluted net income (loss) per share attributable to common stockholders (in thousands, except share and per share data): Three Months Ended Nine Months Ended 2020 2021 2020 2021 Basic EPS Numerator: Net income (loss) attributable to AppLovin $ (89,688 ) $ 178 $ (106,415 ) $ 4,080 Less: Income attributable to convertible preferred stock — — — (499 ) Income attributable to options exercised via promissory notes — (1 ) — (49 ) Income attributable to unvested early exercised options — — — (13 ) Income attributable to unvested RSA’s — — — (7 ) Net income (loss) attributable to common stock—Basic $ (89,688 ) $ 177 $ (106,415 ) $ 3,512 Denominator: Weighted-average shares used in computing net income (loss) per share—Basic 214,638,272 368,427,532 212,998,263 309,353,304 Net income (loss) per share attributable to common stock—Basic $ (0.42 ) $ 0.00 $ (0.50 ) $ 0.01 Three Months Ended Nine Months Ended 2020 2021 2020 2021 Diluted EPS Numerator: Net income (loss) attributable to AppLovin $ (89,688 ) $ 178 $ (106,415 ) $ 4,080 Less: Income attributable to convertible preferred stock — — — (475 ) Income attributable to options exercised via promissory notes — (1 ) — (47 ) Income attributable to unvested early exercised options — — — (12 ) Income attributable to unvested RSA’s — — — (7 ) Net income (loss) attributable to common stock—Diluted $ (89,688 ) $ 177 $ (106,415 ) $ 3,539 Denominator: Weighted-average shares used in computing net income (loss) per share—Basic 214,638,272 368,427,532 212,998,263 309,353,304 Weighted-average dilutive stock options, RSUs, warrants and other convertible securities — 15,897,253 18,073,488 Weighted-average shares used in computing net income (loss) per share—Diluted 214,638,272 384,324,785 212,998,263 327,426,792 Net income (loss) per share attributable to common stock—Diluted $ (0.42 ) $ 0.00 $ (0.50 ) $ 0.01	The following table sets forth the computation of basic and diluted net income (loss) per share attributable to common stockholders for the years ended December 31, 2018, 2019 and 2020 (in thousands, except share and per share data): Year Ended December 31, 2018 2019 2020 Basic EPS Numerator: Net income (loss) $ (259,995 ) $ 119,040 $ (125,187 ) Less: Income attributable to convertible preferred stock — (39,500 ) — Income attributable to options exercises by promissory notes — (1,088 ) — Income attributable to unvested early exercised options — (39 ) — Income attributable to unvested RSA’s — (2,037 ) — Net income (loss) attributable to common stock $ (259,995 ) $ 76,376 $ (125,187 ) Denominator: Weighted-average shares used in computing net income (loss) per share: Basic 189,533,630 210,937,147 214,936,545 Net income (loss) per share attributable to common stock: Basic $ (1.37 ) $ 0.36 $ (0.58 ) Diluted EPS Numerator: Net income (loss) $ (259,995 ) $ 119,040 $ (125,187 ) Less: Income attributable to convertible preferred stock — (39,329 ) — Income attributable to options exercises by promissory notes — (1,083 ) — Income attributable to unvested early exercised options — (39 ) — Income attributable to unvested RSA’s — (2,028 ) — Net income (loss) attributable to common stock $ (259,995 ) $ 76,561 $ (125,187 ) Denominator: Weighted-average shares used in computing net income (loss) per share: Basic 189,533,630 210,937,147 214,936,545 Weighted-average dilutive stock options — 1,428,282 — Weighted-average shares used in computing net income (loss) per share: Diluted 189,533,630 212,365,429 214,936,545 Net income (loss) per share attributable to common stock: Diluted $ (1.37 ) $ 0.36 $ (0.58 )
Summary of Antidilutive Potential Common Shares	The following table presents the forms of antidilutive potential common shares: As of September 30, 2020 2021 Convertible preferred stock 109,090,908 — Stock options exercised for promissory notes 7,862,499 2,884,999 Shares issuable upon conversion of Athena convertible security — 334,946 Early exercised stock options 19,800 879,600 Unvested RSAs 1,908,687 242,316 Stock options 20,439,544 23,736 Unvested RSUs — 2,828 ESPP — 223,448 Total antidilutive potential common shares 139,321,438 4,591,873	The following table presents the forms of antidilutive potential common shares: Year Ended December 31, 2019 2020 Convertible preferred stock 109,090,908 109,090,908 Options exercised for promissory notes 5,760,000 8,022,499 Early exercised options 11,337 19,800 Unvested RSAs 3,924,414 1,236,771 Options 7,439,700 20,754,985

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Summary Of Net Income (Loss) Before Income Taxes	Net income (loss) before income taxes for the years ended December 31, 2018, 2019 and 2020, includes the following components (in thousands): Year Ended December 31, 2018 2019 2020 U.S. $ (286,809 ) $ 149,797 $ (118,296 ) Foreign 46,550 (23,563 ) (17,410 ) Net income (loss) before income tax $ (240,259 ) $ 126,234 $ (135,706 )
Summary Of Provision for Benefit From Income Taxes	Provision for (benefit from) income taxes for the years ended December 31, 2018, 2019 and 2020 consist of the following (in thousands): Year Ended December 31, 2018 2019 2020 Current: Federal $ 16,905 $ 23,703 $ 20,162 State 689 1,888 4,087 Foreign 1,329 568 4,027 18,923 26,159 28,276 Deferred: Federa l 993 (720 ) (29,235 ) State (31 ) (99 ) (4,800 ) Foreign (149 ) (18,146 ) (4,013 ) 813 (18,965 ) (38,048 ) Total provision for (benefit from) income taxes $ 19,736 $ 7,194 $ (9,772 )
Summary Of Reconciliation Of Federal Statutory Income Tax Rate To The Effective Income Tax Rate	The reconciliation of federal statutory income tax rate to the effective income tax rate is as follows (in thousands): Year Ended December 31, 2018 2019 2020 Tax provision (benefit) at U.S. federal statutory rate $ (50,454 ) $ 26,509 $ (28,498 ) State income taxes, net of federal benefit 539 1,412 (1,137 ) Foreign income taxed at different rates (9,690 ) 2,887 8,710 Change in foreign deferred tax rate — (17,143 ) (6,038 ) Stock-based compensation 830 1,671 10,347 Foreign-derived intangible income (6,246 ) (8,600 ) (3,518 ) Research and development credits (933 ) (1,025 ) (2,561 ) Transaction costs — 428 601 Extinguishments of acquisition-related contingent consideration — — 12,237 Effect of the Tax Act—transition tax 1,074 — — Global intangible low-taxed income 7,453 — — Note premium costs 67,018 — — Warrant Expense 12,259 — — Other (2,114 ) 1,055 85 Total provision for (benefit from) income taxes $ 19,736 $ 7,194 $ (9,772 )
Summary Of Current And Deferred Tax Assets And Liabilities	The following summarizes the current and deferred tax assets and liabilities (in thousands): As of December 31, 2019 2020 Deferred tax assets: Accrued expenses and reserves $ 1,871 $ 4,757 Stock-based compensation 1,134 1,955 Tax credit carryforwards 183 2,526 Federal benefit from state taxes 553 1,047 Net operating loss 2,959 3,787 Interest rate swap 1,171 — Embedded derivative — (1,303 ) Identified intangibles 6,028 8,996 Operating lease liability 3,785 20,551 Valuation allowance — (531 ) Total deferred tax assets 17,684 41,785 Deferred tax liabilities: Depreciation and amortization (8,419 ) (6,857 ) Operating lease right-of-use assets (3,270 ) (20,345 ) Total deferred tax liabilities (11,689 ) (27,202 ) Net deferred tax assets $ 5,995 $ 14,583
Summary Of Activity Related To The Gross Unrecognized Tax Benefits	limitations under IRC Section 382 and similar state provisions. The annual limitation may result in the expiration of the net operating loss carryforwards before utilization. The Company has not provided U.S. income or foreign withholding taxes on the undistributed earnings of its foreign subsidiaries as of December 31, 2019 and 2020, because it intends to permanently reinvest such earnings outside of the U.S. If these foreign earnings were to be repatriated in the future, the related U.S. tax liability will be immaterial, due to the participation exemption put in place in the Tax Act . Uncertain Tax Positions The following table summarizes the activity related to the gross unrecognized tax benefits (in thousands): As of December 31, 2019 2020 Balance at beginning of year $ 2,858 $ 6,646 Increases related to prior year positions 2,377 4,681 Increases related to current year positions 1,581 3,498 Decreases related to lapse of statutes (170 ) (424 ) Balance at end of year $ 6,646 $ 14,401

Geographic Information (Tables)

Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Summary Of Property And Equipment	The following table presents the property and equipment, net by geographic area (in thousands): As of December 31, 2018 2019 2020 United States $ 8,295 $ 7,679 $ 27,942 All other countries 232 222 645 Total property and equipment, net $ 8,527 $ 7,901 $ 28,587

Description of Business and P_2

Description of Business and Principles of Consolidation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 19, 2021	May 20, 2020	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Date of incorporation				Jul. 18, 2011
Entity incorporation state or country code				DE
Common stock shares authorized			1,700,000,000	429,600,000
Common stock shares issued			373,641,135	226,364,401
Common stock shares outstanding			373,641,135	226,364,401
Stockholders equity note stock split		3-for-1
Conversion Of Stock Shares Issued For Each Share Converted			1	1
Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Conversion Of Stock Conversion Period			180 days
Minimum [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Conversion Of Stock Conversion Period			61 days
KKR Denali Holdings L P [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Repayment of revolving credit facility	$ 400
Restated Certificate of Incorporation
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common stock shares authorized		429,600,000
Common Class A [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common stock shares authorized			1,500,000,000	386,400,000	360,000,000
Common stock shares issued			225,833,513	183,800,251	177,593,772
Common stock shares outstanding			225,833,513	183,800,251	177,593,772
Class Of Warrant Or Right Number Of Votes For Each Warrant Or Right			1
Common Class A [Member] | Restated Certificate of Incorporation
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common stock shares authorized	1,500,000,000	386,400,000
Common Class A [Member] | Conversion Of Class A Common Stock Into Class B Common Stock [Member] | Adam Foroughi [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common Stock Shares Converted From One Class To Another	150,307,622
Common Class B [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common stock shares authorized			200,000,000	0
Common stock shares issued			147,807,622	0
Common stock shares outstanding			147,807,622	0
Class Of Warrant Or Right Number Of Votes For Each Warrant Or Right			20
Common Class B [Member] | Restated Certificate of Incorporation
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common stock shares authorized	200,000,000
Common Class C [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common stock shares issued			0	0
Common stock shares outstanding			0	0
Common Class C [Member] | Restated Certificate of Incorporation
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common stock shares authorized	150,000,000
Preferred Stock [Member] | Restated Certificate of Incorporation
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Preferred stock shares authorized	100,000,000
IPO [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common stock shares issued during the period shares	22,500,000
Sale of stock issue price per share	$ 80
Sale of stock net consideration received on the transaction	$ 1,750
Underwriting discounts and commissions	47.2
Offering expenses	$ 7.9

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)$ / DisstributionPartnerDay	Dec. 31, 2019USD ($)Day$ / DisstributionPartner	Dec. 31, 2018USD ($)$ / DisstributionPartner	Jan. 01, 2019USD ($)
Accounting Policies [Line Items]
Accounts Receivable, Allowance for Credit Loss			$ 0	$ 0	$ 0
Deferred Offering Costs			3,600		0
Capitalized Computer Software, Additions			0	0	0
Goodwill, Impairment Loss			0	0	0
Impairment, Long-Lived Asset, Held-for-Use			0	0
Advertising Expense			550,900	436,100	$ 143,900
Operating Lease, Right-of-Use Asset		$ 77,435	84,336	14,895
Operating Lease, Liability			93,961
Operating Lease, Liability, Current		21,278	22,206	2,510
Operating Lease, Liability, Noncurrent		$ 65,705	$ 71,755	$ 12,745
Minimum Threshold Percentage of Income Tax Benefit for Settlement with Tax Authority			50.00%
Accounting Standards Update 2018-11 [Member]
Accounting Policies [Line Items]
Operating Lease, Right-of-Use Asset						$ 10,100
Operating Lease, Liability						10,100
Operating Lease, Liability, Current						2,200
Operating Lease, Liability, Noncurrent						$ 7,900
Maximum [Member]
Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life			7 years
Estimated average user life		9 months
Minimum [Member]
Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years
Estimated average user life		6 months
Accounts Receivable [Member] | Major Distribution Partners [Member]
Accounting Policies [Line Items]
Number of Major distribution partner | Day			2	1
Accounts Receivable [Member] | Major Distribution Partners [Member] | Major Distrubutor Partner one [Member]
Accounting Policies [Line Items]
Concentration Risk, Percentage			20.00%	12.00%
Accounts Receivable [Member] | Major Distribution Partners [Member] | Major Distrubutor Partner Two [Member]
Accounting Policies [Line Items]
Concentration Risk, Percentage			13.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member]
Accounting Policies [Line Items]
Number of major customers | $ / DisstributionPartner			0	0	0

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Summary of revenue disaggregated by type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Revenue	$ 726,951	$ 381,740	$ 1,999,634	$ 941,249	$ 1,451,086	$ 994,104	$ 483,363
Business Revenue—Apps [Member]
Revenue from External Customer [Line Items]
Revenue	156,208	132,583	475,394	327,915	503,867	397,643	166,259
Consumer Revenue—Software Platform [Member]
Revenue from External Customer [Line Items]
Revenue					207,285	198,305	262,997
Consumer Revenue [Member]
Revenue from External Customer [Line Items]
Revenue	377,436	209,316	1,096,850	486,072	739,934	398,156	54,107
Business Revenue [Member]
Revenue from External Customer [Line Items]
Revenue	$ 349,515	$ 172,424	$ 902,784	$ 455,177	$ 711,152	$ 595,948	$ 429,256

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Summary of revenue disaggregated by geography (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 1,451,086	$ 994,104	$ 483,363
United States
Disaggregation of Revenue [Line Items]
Revenues	895,987	622,051	261,734
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	78,681	60,073	47,982
Rest of the World
Disaggregation of Revenue [Line Items]
Revenues	$ 476,418	$ 311,980	$ 173,647

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Summary of Property and Equipment, net (Details)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Software Development [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	Over the shorter of useful life (up to 10 years) or lease term
Minimum [Member] | Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Minimum [Member] | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member] | Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Maximum [Member] | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years

Revenue - Summary of Revenue Di

Revenue - Summary of Revenue Disaggregated by Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Revenue	$ 726,951	$ 381,740	$ 1,999,634	$ 941,249	$ 1,451,086	$ 994,104	$ 483,363
Business Revenue Apps [Member]
Revenue from External Customer [Line Items]
Revenue	156,208	132,583	475,394	327,915	503,867	397,643	166,259
Business Revenue - Software Platform [Member]
Revenue from External Customer [Line Items]
Revenue	193,307	39,841	427,390	127,262
Business Revenue [Member]
Revenue from External Customer [Line Items]
Revenue	349,515	172,424	902,784	455,177	711,152	595,948	429,256
Consumer Revenue [Member]
Revenue from External Customer [Line Items]
Revenue	$ 377,436	$ 209,316	$ 1,096,850	$ 486,072	$ 739,934	$ 398,156	$ 54,107

Revenue - Summary of Revenue _2

Revenue - Summary of Revenue Disaggregated by Geography (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 726,951	$ 381,740	$ 1,999,634	$ 941,249	$ 1,451,086	$ 994,104	$ 483,363
Rest Of The World [Member]
Disaggregation of Revenue [Line Items]
Revenue	289,450	147,310	789,788	354,919
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 437,501	$ 234,430	$ 1,209,846	$ 586,330

Revenue - Narrative (Details)

Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Deferred Revenue	$ 63.1	$ 44	$ 86.9	$ 8.2

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value By Fair Value Hierarchy Level [Line Items]
Balance Sheet Location	Deferred acquisition costs, current	Deferred acquisition costs, current
Financial Assets	$ 825,759	$ 12,093
Financial Liability	$ 25,000	$ 46,500
Money market funds [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Balance Sheet Location	Cash and cash equivalents	Cash and cash equivalents	Cash and cash equivalents
Financial Assets	$ 820,594	$ 6,413	$ 340,532
Marketable security [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Balance Sheet Location	Prepaid expenses and other current assets
Financial Assets	$ 5,165
Embedded derivative [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Balance Sheet Location		Long-term debt
Financial Assets		$ 5,680
Convertible security [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Balance Sheet Location		Deferred acquisition costs, current
Financial Liability		$ 46,500
Interest Rate Swap [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Balance Sheet Location			Accrued liabilities
Financial Liability			$ 5,336
Level 1 [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Financial Assets	825,759	6,413
Financial Liability	25,000	0
Level 1 [Member] | Money market funds [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Financial Assets	820,594	6,413	340,532
Level 1 [Member] | Marketable security [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Financial Assets	5,165
Level 1 [Member] | Embedded derivative [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Financial Assets		0
Level 2 [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Financial Assets	0	0
Financial Liability	0	0
Level 2 [Member] | Money market funds [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Financial Assets	0	0
Level 2 [Member] | Embedded derivative [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Financial Assets		0
Level 2 [Member] | Interest Rate Swap [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Financial Liability			$ 5,336
Level 3 [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Financial Assets	0	5,680
Financial Liability	0	46,500
Level 3 [Member] | Money market funds [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Financial Assets	$ 0	0
Level 3 [Member] | Embedded derivative [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Financial Assets		5,680
Level 3 [Member] | Convertible security [Member]
Fair Value By Fair Value Hierarchy Level [Line Items]
Financial Liability		$ 46,500

Fair Value Measurements - Sum_2

Fair Value Measurements - Summary of Reconciliation of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Apr. 16, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Disclosure Of Reconciliation Of The Companys Financial Asset And Liability Measured At Fair Value [Line Items]
Change in fair value recognized in earnings	$ 1,100	$ 0	$ 7,600	$ 0
Embedded derivative [Member] | Fair Value, Inputs, Level 3 [Member]
Disclosure Of Reconciliation Of The Companys Financial Asset And Liability Measured At Fair Value [Line Items]
Balance beginning			5,680	0	$ 0
Addition related to the issuance of term loans in February 2021			5,630
Extinguishment of term loans in February 2021			(1,130)
Change in fair value recognized in earnings			7,640		5,680
Settlements			(17,820)
Transfers			0
Balance ending		0	0		5,680
Convertible security [Member]
Disclosure Of Reconciliation Of The Companys Financial Asset And Liability Measured At Fair Value [Line Items]
Change in fair value recognized in earnings		1,000	3,500		1,500
Convertible security [Member] | Fair Value, Inputs, Level 3 [Member]
Disclosure Of Reconciliation Of The Companys Financial Asset And Liability Measured At Fair Value [Line Items]
Balance beginning			46,500	$ 0	0
Addition related to the issuance of term loans in February 2021			0
Extinguishment of term loans in February 2021			0
Initial fair value recognition					45,000
Change in fair value recognized in earnings			3,500		1,500
Settlements			(25,000)
Transfers			(25,000)
Balance ending		$ 0	$ 0		$ 46,500

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) $ / shares in Units, $ in Thousands	Apr. 16, 2021USD ($)	Oct. 31, 2021USD ($)$ / sharesshares	Aug. 31, 2021USD ($)$ / sharesshares	Sep. 30, 2021USD ($)shares	Jun. 30, 2021shares	Sep. 30, 2020shares	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)dshares	Dec. 31, 2019shares	Dec. 31, 2018shares	Feb. 28, 2021USD ($)
Gain loss due to change in the fair value	$ 1,100			$ 0			$ 7,600	$ 0
Embedded derivative	$ 17,800											$ 5,600
Percentage of convertible security converted			50.00%
Convertible Security Stated Value			$ 20,000
Issuance of common stock warrants and options in connection with an acquisition (in shares) | shares				405,205
Conversion price (in dollars per share) | $ / shares			$ 49.4
Amended Revolving Credit Facility Member [Member] | Affiliate Of Kkr Denali Member [Member]
Decrease In The Variable Interest Rate Margin	0.25%
Class A, Class B and Class F Common Stock [Member]
Issuance of common stock warrants and options in connection with an acquisition (in shares) | shares				405,205	6,320,688	2,479,996
Class A, Class B and Class F Common Stock [Member] | Common Class A [Member]
Issuance of common stock warrants and options in connection with an acquisition (in shares) | shares			405,205						2,479,996	3,267,792	4,754,130
Fair Value, Inputs, Level 1 [Member]
Unrealized gain (loss) due to change in fair value of marketable securities				$ 400			5,200
Subsequent Event [Member]
Percentage of convertible security converted		50.00%
Convertible Security Stated Value		$ 20,000
Conversion price (in dollars per share) | $ / shares		$ 61.7
Subsequent Event [Member] | Class A, Class B and Class F Common Stock [Member] | Common Class A [Member]
Issuance of common stock warrants and options in connection with an acquisition (in shares) | shares		324,156
Convertible Debt Securities [Member]
Gain loss due to change in the fair value				$ 1,000			$ 3,500		$ 1,500
Convertible Debt, Fair Value Disclosures									$ 45,000
Convertible Debt Securities [Member] | Measurement Input Expected Time of IPO Occurance First Quarter [Member]
Debt Instrument, Measurement Input | d									50
Convertible Debt Securities [Member] | Measurement Input Expected Time of IPO Occurance Second Quarter [Member]
Debt Instrument, Measurement Input | d									25
Embedded Derivative Financial Instruments [Member]
Gain loss due to change in the fair value of embedded derivatives									$ 5,700
Embedded Derivative Financial Instruments [Member] | Measurement Input Expected Time of IPO Occurance First Quarter [Member]
Embedded Derivative Liability, Measurement Input | d									50
Embedded Derivative Financial Instruments [Member] | Measurement Input Expected Time of IPO Occurance Second Quarter [Member]
Embedded Derivative Liability, Measurement Input | d									25

Property and Equipment, Net - S

Property and Equipment, Net - Schedule Of Property Plant And Equipment Table (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		$ 58,168	$ 33,253
Less: accumulated depreciation		(29,581)	(25,352)
Total property and equipment, net	$ 62,910	28,587	7,901	$ 8,527
Computer equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		33,977	29,505
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		18,176	421
Software and licenses
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		3,191	2,994
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		$ 2,824	$ 333

Property and Equipment, Net - N

Property and Equipment, Net - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Depreciation	$ 14.2	$ 7.9	$ 7.6
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Finance Lease, Right-of-Use Asset, before Accumulated Amortization	$ 21	$ 20

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2021	May 31, 2021	Dec. 31, 2020
Purchase Obligation			$ 136,248
Contractual Obligation		$ 130,000	130,000
Amended Contractual Obligation		$ 300,000
Purchase commitments to Cloud Service Provider [Member]
Purchase Obligation			131,200
Purchase commitments to Obtaining Intellectual Propertyrights [Member]
Purchase Obligation			5,000
Standby Letters of Credit [Member]
Letters of Credit Outstanding, Amount	$ 11,100		$ 11,100

Commitments and Contingencies_2

Commitments and Contingencies - Summary of commercial agreement (Details) $ in Thousands	Dec. 31, 2020USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]
2021	$ 16,389
2022	27,436
2023	28,423
2024	31,000
2025	33,000
Total non-cancelable purchase commitments	$ 136,248

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details)	Apr. 20, 2021USD ($)	Nov. 30, 2020USD ($)d	May 19, 2020USD ($)LEASE	Apr. 06, 2020USD ($)	Jan. 31, 2020USD ($)	Sep. 04, 2018USD ($)$ / sharesshares	Mar. 31, 2018USD ($)	Aug. 31, 2021USD ($)	Jun. 30, 2021USD ($)	May 31, 2021shares	Apr. 30, 2021USD ($)transaction	Feb. 28, 2021USD ($)	Jan. 31, 2021USD ($)	Nov. 30, 2020USD ($)d	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Aug. 31, 2019USD ($)	Apr. 30, 2019USD ($)	Jan. 31, 2019USD ($)Day	Apr. 30, 2020USD ($)Daytransaction	Sep. 30, 2021USD ($)	Jun. 30, 2021USD ($)shares	Sep. 30, 2020USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)shares
Consideration paid							$ 19,800,000
Fair value of common stock issued or issuable																											$ 0	$ 38,167,000	$ 38,167,000	$ 192,000
Asset acquisition, earn-out payment																			$ 30,000,000
Asset Acquisition Consideration Transferred Contingent Consideration Earn Out Term																				4 years
Consideration transferred, liabilities incurred																											342,170,000	0	45,000,000	0
Business Combination, Goodwill																					$ 997,661,000				$ 997,661,000	$ 249,773,000	997,661,000		249,773,000	137,121,000	$ 98,645,000
Payments for asset acquisitions																				$ 35,000,000									46,400,000	16,200,000
Asset Acquisition Development Services Agreement Term																				2 years
Asset Acquisition, Number Of Apps | Day																				2
Asset Acquisition, Annual Earn-out Payment Period																4 years
Asset Acquisition Consideration Transferred Contingent Consideration Costs																							$ 12,400,000					26,100,000
Net income (loss)																					(51,000)		(102,917,000)				3,963,000	(230,779,000)	(179,415,000)	(105,353,000)
Asset acquisition recognized identifiable Assets acquired And liabilities assumed mobile game apps								$ 150,000	$ 134,000		$ 306,000									$ 35,000,000		$ 134,000
Asset acquisition consideration transferred, contingent consideration															$ 106,100					$ 45,000,000
Transactions | transaction																				2
Stock Issued During Period, Shares, Conversion of Convertible Securities | shares																						109,090,908
Asset Acquisition Number Of Game Developers | Day																				2
Development Services Agreement Renewal Term																				2 years
Asset Acquisition Contingent Consideration Liability															34,800,000
Asset Acquisition Contingent Consideration Settlement Cash Payment															3,400,000
Asset Acquisition Contingent Consideration Settlement Fair Value Of Common Stock Issued															106,100,000
Business Acquisition Consideration Transferred Contingent Consideration Earn Out Payment							79,200,000
Asset Acquisition Consideration Transferred Convertible Security Fair Value														$ 45,000,000
Gain Loss On Settlement Of Asset Acquisition Related Contingent Consideration															74,700,000
Purchase consideration at stated value	$ 980,000,000
Acquisition Of Certain Mobile Game Apps [Member]
Asset acquisition, earn-out payment											$ 50,000,000
Asset Acquisition Consideration Transferred Contingent Consideration Earn Out Term											4 years
Asset Acquisition, Consideration Transferred, Transaction Cost									4,000,000		$ 6,000,000
Payments for asset acquisitions									$ 130,000,000		$ 300,000,000
Asset Acquisition Acquired Asset Amortization Period									9 years		8 years
Asset Acquisition Development Services Agreement Term									4 years		4 years
Asset Acquisition Consideration Transferred Contingent Consideration Costs																					9,900,000						97,500,000
Transactions | transaction											2
A2020 Asset Acquisition [Member]
Asset Acquisition Consideration Transferred Contingent Consideration Costs																					700,000						68,600,000
A2020 Mobile App Acquisition [Member]
Payments for asset acquisitions													$ 60,000,000
A2019 Asset Acquisition [Member]
Payments for asset acquisitions												$ 90,000,000
Mobile App One [Member]
Asset Acquisition Acquired Asset Amortization Period																				3 years
Mobile App Two [Member]
Asset Acquisition Acquired Asset Amortization Period																				5 years
Two Thousand and Ninteen Acquisition Related Contingent Consideration Settlement [Member]
Asset Acquisition Contingent Consideration Settlement Cash Payment															3,400,000
Asset Acquisition Contingent Consideration Settlement Fair Value Of Common Stock Issued															106,100,000
Two Thousand and Ninteen Acquisition Related Contingent Consideration Settlement [Member] | Previously Reported [Member]
Asset Acquisition Contingent Consideration Settlement Fair Value Of Common Stock Issued															48,400,000
Gain Loss On Settlement Of Asset Acquisition Related Contingent Consideration															$ 17,000,000
Fair Value Adjustment To Amortization Expense [Member]
Net income (loss)																					0		(5,934,000)				(7,325,000)	(42,058,000)	23,600,000	62,000,000
Fair Value Adjustment To Revenue [Member]
Net income (loss)																					682,000		22,542,000				1,219,000	31,584,000	61,900,000	61,900,000
Acquisition-related Costs [Member]
Net income (loss)																					0		0				14,115,000	(2,617,000)	8,700,000
Interest Expense Adjustment Related To New And Pre Existing Debt [Member]
Net income (loss)																					0		(2,652,000)				(2,640,000)	97,107,000	106,000,000	147,900,000
Other Income Liability Classified Awards Adjustment [Member]
Net income (loss)																					0		0				0	(1,730,000)	1,700,000	9,000,000
Adjustment To Income Taxes [Member]
Net income (loss)																					(156,000)		$ (3,201,000)				(1,232,000)	$ (18,877,000)	34,700,000	$ 3,300,000
Geewa A.S [Member]
Total consideration					$ 25,629,000
Consideration paid					23,500,000
Consideration indemnity holdback					2,100,000
Business combination acquisition related costs					300,000
Business Combination, Goodwill					9,805,000
Business Combination Consideration Transferred Purchase Consideration Holdback					2,100,000
Business Combination, Consideration Transferred					$ 25,629,000
Geewa A.S [Member] | Developed Technology Rights [Member]
Weighted average, useful life, intangible assets					2 years
Redemption Games, Inc [Member]
Total consideration				$ 53,700,000
Business acquisition, percentage of voting interests acquired				95.50%
Total purchase consideration				$ 56,232,000
Business Combination, Goodwill				20,198,000
Business Acquisition, Transaction Costs				600,000
Business combination, ownership interest		98.2												98.2
Fair value of minority shares				2,556,000
Business Combination, Consideration Transferred				$ 53,700,000
Redemption Games, Inc [Member] | Convertible Securities Convertible Into Class A Common Stock [Member]
Business combination, exchange of minority shares		2.7												2.7
Redemption Games, Inc [Member] | Common Class A [Member]
Fair value of common stock issued or issuable		$ 4,500,000
Fair value of minority shares		1,500,000												$ 1,500,000
Redemption Games, Inc [Member] | Minority Shares [Member]
Fair value of minority shares		$ 1,500,000												1,500,000
Machine Zone, Inc [Member]
Total consideration			$ 328,555,000
Consideration paid			287,100,000
Fair value of common stock issued or issuable			38,200,000
Business Combination, pro forma information, revenue of acquiree actual																								$ 64,200,000		113,800,000
Business combination, pro forma information, earnings or loss of acquiree , actual																								$ 66,200,000		$ 89,700,000
Business Combination, Goodwill			82,353,000
Business Acquisition, Transaction Costs			2,800,000
Business combination, settlement of receivables			3,300,000
Business Combination, Consideration Transferred			$ 328,555,000
Machine Zone, Inc [Member] | IP License [Member]
Weighted average, useful life, intangible assets			2 years
Business combination, remaining future fixed payments			$ 37,100,000
Zenlife asset acquisition [Member]
Payments for asset acquisitions																$ 160,000,000
Asset Acquisition Acquired Asset Amortization Period																5 years
Asset Acquisition Development Services Agreement Term																4 years
Asset Acquisition, Annual Earn-out Payment Period																4 years
Asset Acquisition, Annual Earn-out Payment Period																$ 13,300,000
Asset acquisition recognized identifiable Assets acquired And liabilities assumed mobile game apps																173,300,000
Asset acquisition recognized identifiable assets acquired and liabilities assumed deferred tax liability																13,300,000
Asset Acquisition, Consideration Transferred																$ 173,300,000
Athena asset acquisition [Member]
Payments for asset acquisitions														$ 110,000,000
Asset Acquisition Acquired Asset Amortization Period														6 years
Asset Acquisition, Annual Earn-out Payment Period														4 years
Asset acquisition deferred cash consideration														$ 20,000,000
Number of trading days for determining the share price of class A common stock														20 days
Multiplier to weighted average trading price | d		0.8												0.8
Asset acquisition recognized identifiable Assets acquired And liabilities assumed mobile game apps		$ 170,700,000												$ 170,700,000
Asset acquisition recognized identifiable Assets acquired And liabilities asssumed trade name		4,000,000												4,000,000
Asset acquisition recognized identifiable assets acquired and liabilities assumed deferred tax liability		$ 700,000												700,000
Asset Acquisition Consideration Transferred Deferred Cash Consideration Fair Value														19,000,000
Athena asset acquisition [Member] | Convertible Security [Member]
Asset acquisition consideration transferred convertible security principal amount														40,000,000
Asset Acquisition Consideration Transferred Convertible Security Principal Amount														$ 40,000,000
Adjust Gmbh [Member]
Total consideration	967,817,000
Consideration paid	578,000,000
Business Combination, pro forma information, revenue of acquiree actual																									49,400,000
Business combination, pro forma information, earnings or loss of acquiree , actual																									$ 29,600,000
Consideration transferred, liabilities incurred	342,200,000
Business Combination, Goodwill	776,147,000
Business Acquisition, Transaction Costs	3,100,000
Business Combination Consideration Transferred Liabilities Incurred Cash Hold back	47,600,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount	692,500,000
Stock Issued During Period, Shares, Conversion of Convertible Securities | shares										6,320,688
Business Combination, Consideration Transferred	967,817,000
Adjust Gmbh [Member] | Carrying Reported Amount Fair Value Disclosure
Business Combination Purchase Consideration Convertible Securities At Stated Value	352,000,000
Cash hold back, stated value	$ 50,000,000
Adjust Gmbh [Member] | Developed Technology Rights [Member]
Weighted average, useful life, intangible assets	6 years
Acquisition Of Certain Mobile Game Apps [Member]
Payments for asset acquisitions																					$ 28,800,000						$ 36,800,000
Asset Acquisition Acquired Asset Amortization Period								6 years
Asset acquisition recognized identifiable Assets acquired And liabilities assumed mobile game apps								$ 150,000,000
MAX Advertising Systems, Inc. [Member]
Consideration paid						$ 31,900,000
Fair value of common stock issued or issuable						$ 735,000
Asset Acquisition, Consideration Transferred, Transaction Cost																															600,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares						438,240
Business Acquisition, Share Price | $ / shares						$ 1.68
Total purchase consideration						$ 32,635,000
Business Combination, Goodwill						$ 30,038,000
MAX Advertising Systems, Inc. [Member] | Developed Technology Rights [Member]
Weighted average, useful life, intangible assets						3 years
PeopleFun, Inc. [Member]
Consideration paid							$ 21,507,000																						$ 19,800,000
Asset Acquisition Consideration Transferred Contingent Consideration Earn Out Term							5 years
Business Combination,net working capital adjustment							$ 1,700,000
Asset Acquisition, Consideration Transferred, Transaction Cost							500,000
Total purchase consideration							73,936,000
Business Combination, Goodwill							61,790,000
Fair value of contingent consideration							$ 52,429,000
Cash payment for settlement of contingent consideration																															$ 41,600,000
Equity interests issued for settlement of contingent consideration number of shares issued | shares																														114,372	114,372
PeopleFun, Inc. [Member] | Common Class A [Member]
Fair Value Of Equity Interests Issued For Settlement of Contingent Consideration																															$ 200,000
Cash payment for settlement of contingent consideration																														$ 41,400,000
PeopleFun, Inc. [Member] | Common Class A [Member] | Restricted Stock [Member]
Gain on extinguishment of contingent consideration																															$ 10,800,000
Business acquisition issuance of stock based compensation | shares																															3,120,738
Business Combination 2019 [Member]
Total consideration																														54,600,000
Consideration paid																														51,600,000
Business Combination, Goodwill																														38,500,000
Business Combination, intangible assets																														$ 15,200,000
Weighted average, useful life, intangible assets																														3 years 6 months
Business Combination Deferred Cash Consideration Payable																														$ 3,000,000
Business Combination, deferred consideration payment term																													12 months
Business Combination, other tangible net assets																														900,000
Business Combination, Consideration Transferred																														54,600,000
Recoded Asset Acquisition 2019 [Member]
Deferred Cash Consideration																			90,000,000
Asset acquisition, earn-out payment																			10,000,000
Payments for asset acquisitions																			$ 150,000,000
Asset Acquisition Acquired Asset Amortization Period																			5 years
Minimum notice period for termination of agreement																			30 days
Asset Acquisition, Number Of Apps | Day																			2
Asset acquisition recognized identifiable Assets acquired And liabilities assumed mobile game apps																			$ 240,000,000
Recoded Asset Acquisition 2019 [Member] | Mile Stone One [Member]
Asset acquisition, earn-out payment																			$ 60,000,000
Asset Acquisition Consideration Transferred Contingent Consideration Earn Out Term																			36 months
Asset Acquisition Service Agreement Term																			3 years
Recoded Asset Acquisition 2019 [Member] | Mile Stone Two [Member]
Asset acquisition development agreement term																			6 years
Samfinaco Games Asset Acquisition [Member]
Deferred Cash Consideration																	$ 22,500,000
Asset Acquisition Consideration Transferred Contingent Consideration Costs																													$ 15,300,000	$ 4,100,000
Asset acquisition recognized identifiable Assets acquired And liabilities assumed mobile game apps																	167,100,000
Asset acquisition recognized identifiable assets acquired and liabilities assumed deferred tax liability																	$ 17,100,000
Deferred cash consideration payment period																	15 months
Asset acquisition recognized identifiable assets acquired and liabilities																	$ 4,100,000
Samfinaco Games Asset Acquisition [Member] | Developed Technology Rights [Member]
Payments for asset acquisitions																	$ 131,600,000
Other Asset Acquisitions 2019 [Member]
Deferred Cash Consideration																		$ 10,500,000
Payments for asset acquisitions																		$ 59,400,000
Deferred cash consideration payment period																		15 months
Other Asset Acquisitions 2019 [Member] | User Base [Member]
Asset Acquisition Acquired Asset Amortization Period																		7 years
Asset acquisition recognized identifiable assets acquired and liabilities assumed user base																		$ 68,300,000
Other Asset Acquisitions 2019 [Member] | Developed Technology Rights [Member]
Asset Acquisition Acquired Asset Amortization Period																		2 years
Asset acquisition recognized identifiable Assets acquired And liabilities assumed mobile game apps																		$ 1,300,000
Other Asset Acquisitions 2019 [Member] | Other Assets [Member]
Asset Acquisition, Consideration Transferred, Transaction Cost																		$ 300,000
Exit Of Machine Zone Real Estate Leases [Member]
Increase (decrease) in operating lease, right-of-use asset			57,600,000
Increase (decrease) in operating lease, liability			63,100,000
Leasehold improvements, write off			15,000,000
Adjustments to additional paid in capital, warrants issued			$ 400,000
Business combination separately recognized transaction number of leases exited | LEASE			1
2020 Other Asset Acquisations [Member]
Payments for asset acquisitions																				$ 35,000,000
Asset acquisition recognized identifiable Assets acquired And liabilities assumed mobile game apps																				$ 35,000,000
2020 Other Asset Acquisations [Member] | Maximum [Member]
Asset Acquisition Acquired Asset Amortization Period																				5 years
2020 Other Asset Acquisations [Member] | Minimum [Member]
Asset Acquisition Acquired Asset Amortization Period																				3 years
2020 Other First Asset Acquisations [Member]
Asset Acquisition, Annual Earn-out Payment Period																				2 years
Asset Acquisition Consideration Transferred Contingent Consideration Costs																													500,000
Development Services Agreement Renewal Term																				2 years
2020 Other Second Asset Acquisations [Member]
Asset Acquisition Consideration Transferred Contingent Consideration Earn Out Term																				4 years
Asset Acquisition Consideration Transferred Contingent Consideration Costs																													$ 6,000,000
Asset acquisition consideration transferred, contingent consideration																				$ 45,000,000

Acquisitions - Summary of the F

Acquisitions - Summary of the Fair Value of Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Apr. 20, 2021	May 19, 2020	Apr. 06, 2020	Jan. 31, 2020	Sep. 04, 2018	Mar. 31, 2018	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Goodwill							$ 997,661		$ 249,773	$ 137,121	$ 98,645
Issuance of common stock							$ 0	$ (38,167)	(38,167)	$ (192)
Cash consideration						$ 19,800
PeopleFun, Inc. [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Cash and Cash Equivalents						714
Accounts receivable and other current assets						6,398
Goodwill						61,790
Property and equipment, net						42
Other assets						17
Accounts payable						(2,947)
Contingent consideration						(52,429)
Accrued expenses						(3,049)
Total valuation						73,936
Cash consideration						21,507			$ 19,800
Prepaid expenses and other current assets						121
PeopleFun, Inc. [Member] | Trade Names [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets						$ 230
Estimated useful life						5 years
PeopleFun, Inc. [Member] | Games [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets						$ 10,220
Estimated useful life						3 years
PeopleFun, Inc. [Member] | User Install Base [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets						$ 400
Estimated useful life						3 months
MAX Advertising Systems, Inc. [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Cash and Cash Equivalents					$ 1,093
Accounts receivable and other current assets					52
Goodwill					30,038
Property and equipment, net					32
Other assets					334
Accounts payable					(2,124)
Other liabilities					(1)
Total valuation					32,635
Issuance of common stock					(735)
Cash consideration					31,900
Prepaid expenses and other current assets					11
MAX Advertising Systems, Inc. [Member] | Developed Technology Rights [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets					$ 3,200
Estimated useful life					3 years
Geewa A S [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Cash and Cash Equivalents				$ 1,043
Accounts receivable and other current assets				1,457
Goodwill				9,805
Property and equipment, net				369
Accounts payable, accrued liabilities and other liabilities				(4,935)
Total purchase consideration				25,629
Cash consideration				23,500
Geewa A S [Member] | Trade Names [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets				$ 260
Estimated useful life				5 years
Geewa A S [Member] | Apps [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets				$ 17,040
Estimated useful life				5 years
Geewa A S [Member] | Developed Technology Rights [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets				$ 590
Estimated useful life				2 years
Redemption Games Inc [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Cash and Cash Equivalents			$ 2,787
Accounts receivable and other current assets			1,850
Goodwill			20,198
Other assets			131
Total purchase consideration			53,700
Accounts payable			(2,492)
Other liabilities			(11,142)
Redeemable noncontrolling interest			(2,556)
Total purchase consideration			53,676
Total valuation			56,232
Redemption Games Inc [Member] | Trade Names [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets			$ 900
Estimated useful life			5 years
Redemption Games Inc [Member] | Apps [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets			$ 44,000
Estimated useful life			5 years
Machine Zone Inc [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Cash and Cash Equivalents		$ 37,767
Accounts receivable and other current assets		27,284
Goodwill		82,353
Property and equipment, net		42,312
Deferred revenue		(43,200)
Operating lease liabilities		(139,875)
Total purchase consideration		328,555
Right-of-use assets under operating leases		125,639
Accounts payable, accrued liabilities and other liabilities		(81,591)
License obligations		(35,685)
Issuance of common stock		(38,200)
Cash consideration		287,100
Machine Zone Inc [Member] | Trade Names [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets		$ 13,000
Estimated useful life		10 years
Machine Zone Inc [Member] | Apps [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets		$ 272,000
Machine Zone Inc [Member] | Apps [Member] | Maximum [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Estimated useful life		5 years
Machine Zone Inc [Member] | Apps [Member] | Minimum [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Estimated useful life		3 years
Machine Zone Inc [Member] | IP License [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets		$ 28,551
Estimated useful life		2 years
Adjust Gmbh [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Cash and Cash Equivalents	$ 12,155
Accounts receivable and other current assets	21,840
Goodwill	776,147
Operating lease right-of-use assets	8,130
Property and equipment, net	1,897
Finance lease right-of-use assets	43,156
Other assets	3,191
Deferred revenue	(5,600)
Operating lease liabilities	(8,130)
Finance lease liabilities	(43,156)
Deferred income tax liability	(66,273)
Total purchase consideration	967,817
Accounts payable, accrued liabilities and other liabilities	(15,540)
Cash consideration	578,000
Adjust Gmbh [Member] | Trade Names [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets	$ 8,000
Estimated useful life	5 years
Adjust Gmbh [Member] | Developed Technology Rights [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets	$ 77,000
Estimated useful life	6 years
Adjust Gmbh [Member] | Customer Relationships [Member]
Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed [Line Items]
Intangible assets	$ 155,000
Estimated useful life	12 years

Acquisitions - Supplemental Pro

Acquisitions - Supplemental Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Business Combination and Asset Acquisition [Abstract]
Business acquisition, pro forma revenue	$ 727,633	$ 429,062	$ 2,034,908	$ 1,156,144	$ 1,625,476	$ 1,332,476
Net income (loss)	$ (51)	$ (102,917)	$ 3,963	$ (230,779)	$ (179,415)	$ (105,353)
Net (loss) per share — basic and diluted					$ (0.83)	$ (0.50)

Acquisitions - Pro Forma Adjust

Acquisitions - Pro Forma Adjustments to Net Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition Pro Forma Information [Line Items]
Net income (loss)	$ (51)	$ (102,917)	$ 3,963	$ (230,779)	$ (179,415)	$ (105,353)
An (increase) in amortization expense related to the fair value of acquired identifiable intangible assets, net of the amortization expense already reflected in actual historical results
Business Acquisition Pro Forma Information [Line Items]
Net income (loss)	0	(5,934)	(7,325)	(42,058)	23,600	62,000
A net increase in revenue related to fair value adjustment
Business Acquisition Pro Forma Information [Line Items]
Net income (loss)	682	22,542	1,219	31,584	61,900	61,900
A decrease (increase) in expenses related to transaction expenses
Business Acquisition Pro Forma Information [Line Items]
Net income (loss)	0	0	14,115	(2,617)	8,700
An decrease (increase) in interest expense related to new debt financing, net of interest expense related to pre-existing debt settled as part of the acquisitions
Business Acquisition Pro Forma Information [Line Items]
Net income (loss)	0	(2,652)	(2,640)	97,107	106,000	147,900
A (decrease) in other income - liability classified warrants
Business Acquisition Pro Forma Information [Line Items]
Net income (loss)	0	0	0	(1,730)	1,700	9,000
An (increase) in tax provision
Business Acquisition Pro Forma Information [Line Items]
Net income (loss)	$ (156)	$ (3,201)	$ (1,232)	$ (18,877)	$ 34,700	$ 3,300

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, Net - Summary of Goodwill Activity (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Begining Balacne	$ 249,773	$ 137,121	$ 98,645
Goodwill acquired	776,147	112,356	38,515
Foreign currency translation	(28,259)	296	(39)
Ending Balacne	$ 997,661	$ 249,773	$ 137,121

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets, Net - Summary of Intangible Assets Acquired Net (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Net Book Value	$ 1,758,796	$ 1,086,332	$ 440,905
Long Lived Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,275,907	1,358,052	517,782
Accumulated Amortization	(517,111)	(271,720)	(76,877)
Net Book Value	1,758,796	1,086,332	440,905
Short and Long Lived Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,314,686	1,387,921	533,293
Accumulated Amortization	(553,997)	(297,319)	(89,963)
Net Book Value	$ 1,760,689	$ 1,090,602	443,330
Apps [Member] | Short Lived Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (Years)	4 months 24 days	6 months
Gross Carrying Value	$ 38,779	$ 29,869	15,511
Accumulated Amortization	(36,886)	(25,599)	(13,086)
Net Book Value	$ 1,893	$ 4,270	2,425
Apps [Member] | Long Lived Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (Years)	4 years 10 months 24 days	4 years 3 months 18 days
Gross Carrying Value	$ 1,905,750	$ 1,222,417	433,805
Accumulated Amortization	(439,885)	(232,832)	(65,838)
Net Book Value	$ 1,465,865	989,585	367,967
Customer Relationships [Member] | Long Lived Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (Years)	11 years 7 months 6 days
Gross Carrying Value	$ 149,389	0
Accumulated Amortization	(5,533)	0
Net Book Value	$ 143,856	$ 0
User Base [Member] | Long Lived Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (Years)	4 years 6 months	5 years 3 months 18 days
Gross Carrying Value	$ 68,817	$ 68,817	68,817
Accumulated Amortization	(24,931)	(17,617)	(7,638)
Net Book Value	$ 43,886	$ 51,200	61,179
License Asset [Member] | Long Lived Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (Years)	2 months 12 days	9 months 18 days
Gross Carrying Value	$ 28,551	$ 28,551	0
Accumulated Amortization	(24,107)	(10,918)	0
Net Book Value	$ 4,444	$ 17,633	0
Developed technology [Member] | Long Lived Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (Years)	5 years 4 months 24 days	1 year 4 months 24 days
Gross Carrying Value	$ 89,532	$ 14,946	14,356
Accumulated Amortization	(17,645)	(8,489)	(3,224)
Net Book Value	$ 71,887	$ 6,457	11,132
Other [Member] | Long Lived Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (Years)	6 years 3 months 18 days	7 years 6 months
Gross Carrying Value	$ 33,868	$ 23,321	804
Accumulated Amortization	(5,010)	(1,864)	(177)
Net Book Value	$ 28,858	$ 21,457	$ 627

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets, Net - Summary of Finite-Lived Intangible Assets, Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization of Intangible Assets	$ 102,824	$ 68,585	$ 289,452	$ 146,143	$ 239,926	$ 82,428	$ 8,427
Cost of revenue
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization of Intangible Assets	96,059	65,535	273,444	137,673	228,339	74,787	7,932
Sales and marketing
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization of Intangible Assets	$ 6,765	$ 3,050	$ 16,008	$ 8,470	$ 11,587	$ 7,641	$ 495

Goodwill and Intangible Asset_6

Goodwill and Intangible Assets, Net - Summary of future amortization expense (Details) $ in Thousands	Dec. 31, 2020USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2021	$ 270,818
2022	246,333
2023	244,396
2024	244,396
2025	75,036
Thereafter	9,623
Total	$ 1,090,602

Leases - Summary of Operating L

Leases - Summary of Operating Lease Asstes and Liabilites (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2021	Dec. 31, 2019
Operating Lease Asstes and Liabilites [Abstract]
Operating lease right-of-use assets	$ 84,336	$ 77,435	$ 14,895
Current operating lease liabilities	22,206	21,278	2,510
Non-current operating lease liabilities	$ 71,755	$ 65,705	$ 12,745
Weighted-average remaining term (years)	3 years 8 months 12 days		5 years
Weighted-average discount rate	4.70%		6.00%
Balance Sheet Classification Column elements [Abstract]
Description of location of operating lease right-of-use assets on balance sheet	Operating lease right-of-use assets
Description of location of operating lease liabilities on balance sheet	Operating lease liabilities
Description of location of operating lease non-current liabilities on balance sheet	Operating lease liabilities, non-current

Leases - Summary of Lease, Cost

Leases - Summary of Lease, Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lease, Cost [Abstract]
Operating lease cost	$ 17,372	$ 3,520	$ 2,784
Short-term lease cost	8,196	3,231	3,559
Variable lease cost	2,147	479	276
Total lease cost	$ 27,715	$ 7,230	$ 6,619

Leases - Summary of Finance Lea

Leases - Summary of Finance Lease Asstes and Liabilites (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finance Lease Asstes and Liabilites [Abstract]
Finance lease right-of-use assets	$ 5,067	$ 2,343
Current finance lease liabilities	2,821	1,387
Non-current finance lease liabilities	$ 2,340	$ 940
Weighted-average remaining term (years)	7 months 9 days	5 months 26 days
Weighted-average discount rate	6.00%	6.00%
Balance Sheet Classification Column elements [Abstract]
Description of location of finance lease right-of-use assets on balance sheet	Property and equipment, net
Description of location of finance lease liabilities on balance sheet	Accrued liabilities
Description of location of finance lease non-current liabilities on balance sheet	Other non-current liabilities

Leases - Summary of Operating S

Leases - Summary of Operating Sublease (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
Lessee, Operating Sublease, Description [Abstract]
Fixed Sublease Expense	$ 5,769
Variable Sublease Expense	836
Sublease income	(5,678)
Variable sublease income	(836)
Net Loss	$ 91

Leases - Summary of Lease Liabi

Leases - Summary of Lease Liability Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
2021		$ 26,123
2022		17,874
2023		12,279
2024		12,288
2025		12,601
Thereafter		29,783
Total lease payments		110,948
Less: amount representing interest		16,987
Present value of future lease payments		93,961
Less: current obligations under leases	$ 21,278	22,206	$ 2,510
Non-current lease obligations	$ 65,705	71,755	12,745
Networking Equipment Finance
2021		3,581
2022		2,015
2023		596
Total lease payments		6,192
Less: amount representing interest		1,031
Present value of future lease payments		5,161
Less: current obligations under leases		2,821	1,387
Non-current lease obligations		2,340	$ 940
Total
2021		29,704
2022		19,889
2023		12,875
2024		12,288
2025		12,601
Thereafter		29,783
Total lease payments		117,140
Less: amount representing interest		18,018
Present value of future lease payments		99,122
Less: current obligations under leases		25,027
Non-current lease obligations		$ 74,095

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)ft²	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Operating Leased Assets [Line Items]
Number of Real Estate Properties | ft²	20
Operating leases liabilities	$ 23.8	$ 3.2
Operating Lease payments use	10.8	7.4
Depreciation	14.2	7.9	$ 7.6
Finance lease Interest expense	0.3	0.2	0.4
Finance lease Payments	9.7	5.9
Operating sub lease payments to be received 2021	9.4
Operating sub lease payments to be received 2022	4.8
Network Equipment Under Finance Lease [Member]
Operating Leased Assets [Line Items]
Depreciation	$ 8.4	$ 5.5	$ 5.7
Maximum [Member]
Operating Leased Assets [Line Items]
Lessee operating lease remaining lease term	9 years 2 months 12 days
Lessee operating lease option to extend term	5 years
Finance lease term of contract	36 months
Minimum [Member]
Operating Leased Assets [Line Items]
Lessee operating lease remaining lease term	12 months
Lessee operating lease option to extend term	2 years
Finance lease term of contract	32 months

Credit Agreement - Narrative (D

Credit Agreement - Narrative (Details) - USD ($) $ in Thousands

Apr. 16, 2021

Mar. 31, 2021

Feb. 12, 2021

Sep. 30, 2021

Mar. 31, 2021

Sep. 30, 2021

Sep. 30, 2020

Dec. 31, 2020

Dec. 31, 2019

Dec. 31, 2018

Feb. 28, 2021

Nov. 30, 2020

Oct. 27, 2020

May 06, 2020

Apr. 23, 2019

Aug. 15, 2018

Debt Instrument [Line Items]

Embedded derivative

$ 17,800

$ 5,600

Loss on settlement of debt

$ (16,852)

$ 0

Line of credit non current outstanding

$ 400,000

$ 400,000

Quarterly repayments

$ 4,600

$ 3,100

Percentage of net cash proceeds above a threshold amount

100.00%

Percentage of annual excess cash flow above a threshold amount

50.00%

Percentage of net cash proceeds of certain other debt incurrences

100.00%

Debt instrument, Covenant description

The Credit Agreement contains customary affirmative and negative covenants, including covenants limiting the ability of AppLovin and its restricted subsidiaries to, among other things, incur debt, grant liens, undergo certain fundamental business changes, make investments, pay-out dividends to third parties, dispose of assets, and enter into transactions with affiliates, in each case, subject to limitations and exceptions set forth in the Credit Agreement

Debt instrument, Debt default, Description of event of default

The Credit Agreement also contains customary events of default that include, among other things, certain payment defaults, cross defaults to other indebtedness, covenant defaults, change of control defaults, judgment defaults, and bankruptcy and insolvency defaults. If an event of default exists, the lenders may require the immediate payment of all obligations under the Credit Agreement and may exercise certain other rights and remedies provided for under the Credit Agreement, the other loan documents and applicable law

Debt instrument, Covenant compliance

the Company was in compliance with all of the covenants

Unaccreted discount and debt issuance costs

$ (39,452)

Change in fair value recognized in earnings

$ 1,100

$ 0

$ 7,600

$ 0

Minimum [Member]

Debt Instrument [Line Items]

Extinguishment of debt, Amount

$ 10,000

Annual Excess Cash Flow Above A Threshold Amount Step Down Event One [Member]

Debt Instrument [Line Items]

Annual excess cash flow above a threshold amount, Step down percentage

25.00%

Annual Excess Cash Flow Above A Threshold Amount Step Down Event Two [Member]

Debt Instrument [Line Items]

Annual excess cash flow above a threshold amount, Step down percentage

0.00%

Less than or equal to 3.50 to 1.00 | Annual Excess Cash Flow Above A Threshold Amount Step Down Event Two [Member]

Debt Instrument [Line Items]

Net leverage ratio

3.50

Less than or equal to 4.00 to 1.00 | Annual Excess Cash Flow Above A Threshold Amount Step Down Event One [Member]

Debt Instrument [Line Items]

Consolidated first lien secured debt to consolidated EBITDA, Ratio

4

Greater than 3.50 to 1.00 | Annual Excess Cash Flow Above A Threshold Amount Step Down Event One [Member]

Debt Instrument [Line Items]

Consolidated first lien secured debt to consolidated EBITDA, Ratio

3.50

Net Cash Proceeds Above A Threshold Amount Step Down Event One [Member]

Debt Instrument [Line Items]

Net cash proceeds above a threshold amount, Step down percentage

50.00%

Net Cash Proceeds Above A Threshold Amount Step Down Event One [Member] | Less than or equal to 3.50 to 1.00

Debt Instrument [Line Items]

Consolidated first lien secured debt to consolidated EBITDA, Ratio

3.50

Net Cash Proceeds Above A Threshold Amount Step Down Event One [Member] | Greater than 2.50 to 1.00

Debt Instrument [Line Items]

Consolidated first lien secured debt to consolidated EBITDA, Ratio

2.50

Net Cash Proceeds Above A Threshold Amount Step Down Event Two [Member]

Debt Instrument [Line Items]

Net cash proceeds above a threshold amount, Step down percentage

0.00%

Net Cash Proceeds Above A Threshold Amount Step Down Event Two [Member] | Greater than 2.50 to 1.00

Debt Instrument [Line Items]

Consolidated first lien secured debt to consolidated EBITDA, Ratio

2.50

Fifth Amendment Term Loan [Member]

Debt Instrument [Line Items]

New term loan

597,800

Debt issuance costs

3,500

Third party debt issuance costs that were expensed immediately

2,900

Debt issuance costs, gross

$ 600

Percentage change of present value of cash flow between the original and modified debt

10.00%

Loss on settlement of debt

16,900

Fifth Amendment Term Loan [Member] | Contingent Interest Adjustment Feature [Member]

Debt Instrument [Line Items]

Embedded derivative

$ 5,600

Third Amendment Term Loans [Member]

Debt Instrument [Line Items]

New term loan

$ 300,000

Repayment of long term debt

298,200

Debt instrument, Periodic payment, Principal percentage

0.25%

Amended Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Debt instrument increase in the credit facility

$ 150,000

$ 50,000

Lender commitment under the line of credit

10,000

$ 540,000

$ 50,000

Proceeds from long term line of credit facility

250,000

Line of credit facility maximum borrowing capacity

600,000

600,000

$ 150,000

Line of credit facility, Expiration date

Feb. 15, 2025

Amended Revolving Credit Facility [Member] | Base Rate [Member]

Debt Instrument [Line Items]

Debt instrument, Interest rate, Stated percentage

1.50%

Amended Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]

Debt Instrument [Line Items]

Debt instrument, Interest rate, Stated percentage

2.50%

Amended Revolving Credit Facility [Member] | Affiliate Of KKR Denali [Member]

Debt Instrument [Line Items]

Proceeds from long term line of credit facility

250,000

Line of credit facility maximum borrowing capacity

$ 600,000

$ 600,000

$ 600,000

Decrease in the variable interest rate margin

0.25%

0.25%

Additional Decrease In The Variable Interest Rate Margin

0.25%

Fifth Amendment Term Loan And Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Debt issuance costs paid to related party

$ 800

$ 1,500

$ 2,000

$ 6,500

Closing Term Loans [Member]

Debt Instrument [Line Items]

New term loan

$ 400,000

$ 820,000

Term Loans [Member]

Debt Instrument [Line Items]

Debt instrument, Maturity date

Aug. 15, 2025

Unaccreted discount and debt issuance costs

$ 53,100

Interest Expense, Debt

$ 58,800

$ 65,900

Term Loans And Amended Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Debt instrument, Interest rate terms

The Term Loans and the Revolving Credit Loans bear interest due on a quarterly basis

Term Loans And Amended Revolving Credit Facility [Member] | Base Rate [Member]

Debt Instrument [Line Items]

Debt instrument, Interest rate, Stated percentage

2.50%

Term Loans And Amended Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]

Debt Instrument [Line Items]

Debt instrument, Interest rate, Stated percentage

3.50%

Term Loans And Amended Revolving Credit Facility [Member] | Federal Funds Rate [Member] | Base Rate [Member]

Debt Instrument [Line Items]

Debt instrument, Basis spread on variable rate

0.50%

Term Loans And Amended Revolving Credit Facility [Member] | LIBOR Rate [Member] | Base Rate [Member]

Debt Instrument [Line Items]

Debt instrument, Basis spread on variable rate

1.00%

Credit Agreement - Summary of f

Credit Agreement - Summary of future maturities of long-term debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Long-term Debt, Fiscal Year Maturity [Abstract]
2021		$ 15,210
2022		15,210
2023		15,210
2024		15,210
2025		1,583,492
Total outstanding term loan principal		1,644,332
Embedded derivative		(5,680)
Unaccreted discount and debt issuance costs		(39,452)
Total debt		1,599,200
Less: short-term debt		15,210
Long-term debt	$ 1,731,020	$ 1,583,990	$ 1,168,374

Derivative Instruments - Narrat

Derivative Instruments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Nov. 14, 2018
Derivative [Line Items]
Settlement value of interest rate swap liability before tax	$ 2.9	$ 2.9		$ 5.3
Receive Variable Pay Fixed Rate | Interest Rate Swap
Derivative [Line Items]
Interest rate swap notional amount						$ 410
Derivatives interest rate swap fixed interest rate						2.9065%
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ 2.9	$ 6.7	$ 9.5	$ 2.7	$ 0

Convertible Preferred Stock - N

Convertible Preferred Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2021	Aug. 31, 2021	Dec. 31, 2019	Aug. 15, 2018	Jul. 13, 2018
Class of Stock [Line Items]
Preferred stock value issued	$ 399,589	$ 0		$ 399,589
Preferred stock liquidation preference per share	$ 3.67
Preferred stock convertible conversion price			$ 49.4
Conversion of Preferred Stock to Common stock Trigger
Class of Stock [Line Items]
Threshold minimum proceeds from issuance of common stock trigger for conversion of preferred stock	$ 75,000
Series A Preferred Stock | Restated Certificate of Incorporation
Class of Stock [Line Items]
Preferred stock shares authorized	109,090,908
Preferred stock par or stated value per share	$ 0.00003
Series A Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock convertible conversion price	$ 3.67
KKR Denali
Class of Stock [Line Items]
Preferred stock value issued						$ 400,000
KKR Denali | Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock shares issued					109,090,908

Common Stock - Summary of Commo

Common Stock - Summary of Common Stock and Reserved for Future Issuance (Details) - shares	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Summary of Common Stock Shares Authorized Issued Outstanding and Reserved for Future Issuance [Line Items]
Shares Authorized	1,700,000,000	429,600,000
Issued and Outstanding Shares		226,364,401
Options Available for Future Grants		203,235,599
Common Stock A
Summary of Common Stock Shares Authorized Issued Outstanding and Reserved for Future Issuance [Line Items]
Shares Authorized	1,500,000,000	386,400,000	360,000,000
Issued and Outstanding Shares		183,800,251
Options Available for Future Grants		202,599,749
Common Stock F
Summary of Common Stock Shares Authorized Issued Outstanding and Reserved for Future Issuance [Line Items]
Shares Authorized		43,200,000
Issued and Outstanding Shares		42,564,150
Options Available for Future Grants		635,850

Common Stock - Narrative (Detai

Common Stock - Narrative (Details) - USD ($)	Jan. 03, 2019	Dec. 31, 2020	Sep. 30, 2021	Apr. 19, 2021	May 20, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Common stock shares authorized		429,600,000	1,700,000,000
Common stock par or stated value per share		$ 0.00003	$ 0.00003
Shares issued for each share converted (in shares)		1	1
Additional shares issued for each share converted (in shares)		1
Maximum
Class of Stock [Line Items]
Threshold percentage of common stock issued for preferred stock offering		15.00%
Restated Certificate of Incorporation
Class of Stock [Line Items]
Common stock shares authorized					429,600,000
Common Stock A
Class of Stock [Line Items]
Common stock shares authorized		386,400,000	1,500,000,000			360,000,000
Common stock par or stated value per share		$ 0.00003				$ 0.00003
Common stock, voting rights		one
Common Stock A | Common Stock Warrant | Warrant Transfer Agreement | Angel Pride Holdings Limited
Class of Stock [Line Items]
Stock issued during period shares in connection with prior debt financing	26,021,583
Proceeds from issaunce of common stock warrants	$ 868
Common Stock A | Common Stock Warrant | Warrant Transfer Agreement | Hontai App Fund Limited Partnership
Class of Stock [Line Items]
Stock issued during period shares in connection with prior debt financing	8,794,734
Proceeds from issaunce of common stock warrants	$ 293
Common Stock A | Restated Certificate of Incorporation
Class of Stock [Line Items]
Common stock shares authorized				1,500,000,000	386,400,000
Common stock par or stated value per share					$ 0.00003
Common Stock F
Class of Stock [Line Items]
Common stock shares authorized		43,200,000
Common stock, voting rights		one
Common Stock F | Restated Certificate of Incorporation
Class of Stock [Line Items]
Common stock shares authorized					43,200,000
Common stock par or stated value per share					$ 0.00003

Stock-based Compensation - Summ

Stock-based Compensation - Summary of Stock-based Payment Arrangement Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 34,725	$ 10,868	$ 91,828	$ 19,362	$ 62,387	$ 10,222	$ 5,465
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	922	126	1,504	204	982	124	517
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	4,774	1,571	8,814	2,812	10,668	1,922	2,582
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	20,110	6,823	40,148	10,692	36,852	5,009	1,009
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 8,919	$ 2,348	$ 41,362	$ 5,654	$ 13,885	$ 3,167	$ 1,357

Stock-based Compensation - Su_2

Stock-based Compensation - Summary Of Weighted Average Assumptions Used To Estimate The Fair Value Of Options Granted (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted-average expected term	5 years 11 months 8 days	6 years 18 days	6 years
Expected volatility	39.00%	43.00%	62.00%
Risk-free interest rate	0.56%	1.91%	2.58%
Dividend yield	0.00%	0.00%	0.00%

Stock-based Compensation - Su_3

Stock-based Compensation - Summary Of Stock Options Activity Under The Plan (Details) - $ / shares	1 Months Ended	12 Months Ended
	Jan. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement [Abstract]
Number of Options, Beginning Balance	28,889,524	18,395,130	8,370,552
Number of Options, Granted		13,158,430	12,199,200
Number of Options, Exercised	(185,000)	(871,668)	(1,011,873)
Number of Options, Forfeited		(425,001)	(1,158,528)
Number of Options, Expired		(1,367,367)	(4,221)
Number of Options, Ending Balance		28,889,524	18,395,130	8,370,552
Number of Options, Vested and exercisable		17,099,956
Number of Options, Vested and expected to vest		25,023,502
Weighted Average Exercise Price Per Share, Beginning Balance	$ 5.92	$ 3.78	$ 2.66
Weighted Average Exercise Price Per Share, Granted		8.41	4.36
Weighted Average Exercise Price Per Share, Exercised		2.65	2.61
Weighted Average Exercise Price Per Share, Forfeited		1.68	2.82
Weighted Average Exercise Price Per Share, Expired		4.64	2.81
Weighted Average Exercise Price Per Share, Ending Balance		5.92	$ 3.78	$ 2.66
Weighted Average Exercise Price Per Share, Vested and exercisable		5.26
Weighted Average Exercise Price Per Share, Vested and expected to vest		$ 6.22
Weighted Average Remaining Contractual Term (Years)		8 years 9 months 18 days	9 years 2 months 12 days	9 years 2 months 12 days
Weighted Average Remaining Contractual Term (Years) , Vested and exercisable		8 years 7 months 6 days
Weighted Average Remaining Contractual Term (Years) , Vested and expected to vest		8 years 10 months 24 days

Stock-based Compensation - Su_4

Stock-based Compensation - Summary Of Oustanding Restricted Stock Awards Activity (Details) - Restricted Stock - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Number of Restricted Stock Awards , Beginning Balance	3,924,414	3,664,653
Number of Restricted Stock Awards , Granted	0	3,267,792
Number of Restricted Stock Awards , Repurchased	0	(59,637)
Number of Restricted Stock Awards , Vested	(2,687,643)	(2,948,394)
Number of Restricted Stock Awards , Ending Balance	1,236,771	3,924,414
Weighted Average Grant Date Fair Value per Share , Beginning Balance	$ 1.81	$ 1.68
Weighted Average Grant Date Fair Value per Share , Granted	0	1.97
Weighted Average Grant Date Fair Value per Share , Repurchased	0	1.68
Weighted Average Grant Date Fair Value per Share , Vested	1.85	1.83
Weighted Average Grant Date Fair Value per Share , Ending Balance	$ 1.71	$ 1.81

Stock-based Compensation - Narr

Stock-based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2021	Feb. 28, 2021	Jan. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Capital shares reserved for future issuance								203,235,599
Stock-based compensation expense				$ 34,725	$ 10,868	$ 91,828	$ 19,362	$ 62,387	$ 10,222	$ 5,465
Number of shares stock option								13,158,430	12,199,200
Employee promissory note settled in shares		$ 17,200
Employee promissory note settled in cash		3,700
Liabilities related to exercised options subject to repurchase						$ 2,400		$ 100	$ 100
Tranche One
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Exercised options, right to repurchase, term						1 year		1 year
Tranche Two
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Exercised options, right to repurchase, term						36 months		36 months
Promissory Notes
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Employee promissory note outstanding				$ 15,100		$ 15,100		$ 40,400	$ 20,000
Employee promissory note settled		$ 20,900
Stock Options
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Number of shares stock option								13,158,430	12,199,200	8,764,428
Intrinsic value of options outstanding								$ 1,800,000	$ 23,400
Unrecognized compensation costs								$ 132,200	$ 26,800
Weighted average vesting period								2 years 10 months 24 days
Weighted average grant date stock fair value								$ 15.94	$ 1.97	$ 1.49
Restricted stock units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Number of shares stock option				870,410		6,908,924
Restricted stock units granted				$ 58.92		$ 58.60
Restricted Stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Unrecognized compensation costs								$ 1,800	$ 6,700
Weighted average vesting period								1 year 1 month 6 days
Restricted stock units granted								$ 0	$ 1.97
Maximum | Restricted stock units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period						5 years
Minimum | Restricted stock units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period						4 years
Class A Common Stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Capital shares reserved for future issuance								202,599,749
Number of shares recognized cost		60,968
Number of share options exercised (in shares)				2,884,999		2,884,999		8,022,499	5,760,000
Class A Common Stock | Equity Option
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Exercised options subject to repurchase						879,600		19,800	11,337
Class A Common Stock | Promissory Notes
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Early exercised options with promissory note (in shares)						841,563		4,136,677	4,601,877
2011 equity incentive plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period								4 years
Stock-based compensation expense				$ 300		$ 900		$ 900
Share based compensation by share based payment arrangement number of shares available for issuance								3,486,785
Stock option contractual term								10 years
2011 equity incentive plan | Class A Common Stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Capital shares reserved for future issuance								125,316,000
2011 equity incentive plan | Common Stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Number of shares stock option			206,000
Employee Stock Purchase Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period						24 months
Employee Stock Purchase Plan | Class A Common Stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share based compensation by share based payment arrangement increase in the number of shares available for future issuance as a percentage of outstanding stock						1.00%
Percentage of eligible compensation eligible for participation in the stock purchase plan				15.00%		15.00%
Share based compensation by share based payment arrangement purchase price of the stock as a percentage of fair value						85.00%
Share based compensation by share based payment arrangement maximum number of shares per employee						590
Share based compensation by share based payment arrangement number of shares available for issuance				7,800,000		7,800,000
Share based compensation by share based payment arrangement number of additional shares available for issuance						7,800,000
2021 Partner Studio Incentive Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Capital shares reserved for future issuance				390,000		390,000
2021 Partner Studio Incentive Plan | Restricted stock units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Number of shares stock option	359,623
Restricted stock units granted	$ 57.19
2021 Partner Studio Incentive Plan | Maximum | Restricted stock units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period	5 years
2021 Partner Studio Incentive Plan | Minimum | Restricted stock units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period	4 years
2021 equity incentive plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Capital shares reserved for future issuance				39,000,000		39,000,000
Share based compensation by share based payment arrangement increase in the number of shares available for future issuance						39,000,000
Share based compensation by share based payment arrangement increase in the number of shares available for future issuance as a percentage of outstanding stock						(5.00%)

Net Income (Loss) Per Share - S

Net Income (Loss) Per Share - Summary of Basic and Diluted Net Income (Loss) Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net income (loss)	$ 178	$ 14,423	$ (10,521)	$ (89,688)	$ (21,391)	$ 4,664	$ 4,080	$ (106,415)	$ (125,187)	$ 119,040	$ (259,995)
Income attributable to convertible preferred stock	0			0			(499)	0	0	(39,500)	0
Income attributable to options exercises by promissory notes	(1)			0			(49)	0	0	(1,088)	0
Income attributable to unvested early exercised options	0			0			(13)	0	0	(39)	0
Income attributable to unvested RSA's	0			0			(7)	0	0	(2,037)	0
Net income (loss) attributable to common stock	$ 177			$ (89,688)			$ 3,512	$ (106,415)	$ (125,187)	$ 76,376	$ (259,995)
Denominator:
Weighted-average shares used in computing net income (loss) per share: Basic	368,427,532			214,638,272			309,353,304	212,998,263	214,936,545	210,937,147	189,533,630
Net income (loss) per share attributable to common stock: Basic	$ 0			$ (0.42)			$ 0.01	$ (0.50)	$ (0.58)	$ 0.36	$ (1.37)
Numerator:
Net income (loss)	$ 178	$ 14,423	$ (10,521)	$ (89,688)	$ (21,391)	$ 4,664	$ 4,080	$ (106,415)	$ (125,187)	$ 119,040	$ (259,995)
Income attributable to convertible preferred stock	0			0			(475)	0	0	(39,329)	0
Income attributable to options exercises by promissory notes	(1)			0			(47)	0	0	(1,083)	0
Income attributable to unvested early exercised options	0			0			(12)	0	0	(39)	0
Income attributable to unvested RSA's	0			0			(7)	0	0	(2,028)	0
Net income (loss) attributable to common stock	$ 177			$ (89,688)			$ 3,539	$ (106,415)	$ (125,187)	$ 76,561	$ (259,995)
Denominator:
Weighted-average shares used in computing net income (loss) per share: Basic	368,427,532			214,638,272			309,353,304	212,998,263	214,936,545	210,937,147	189,533,630
Weighted-average dilutive stock options	15,897,253			0			18,073,488		0	1,428,282	0
Weighted-average shares used in computing net income (loss) per share: Diluted	384,324,785			214,638,272			327,426,792	212,998,263	214,936,545	212,365,429	189,533,630
Net income (loss) per share attributable to common stock: Diluted	$ 0			$ (0.42)			$ 0.01	$ (0.50)	$ (0.58)	$ 0.36	$ (1.37)

Net Income (Loss) Per Share -_2

Net Income (Loss) Per Share - Summary of Antidilutive Potential Common Shares (Details) - shares	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common shares	4,591,873	139,321,438
Convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common shares	0	109,090,908	109,090,908	109,090,908
Stock options exercised for promissory notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common shares	2,884,999	7,862,499	8,022,499	5,760,000
Shares issuable upon conversion of Athena convertible security
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common shares	334,946	0
Early exercised stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common shares	879,600	19,800	19,800	11,337
Unvested RSAs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common shares	242,316	1,908,687	1,236,771	3,924,414
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common shares	23,736	20,439,544	20,754,985	7,439,700
Unvested RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common shares	2,828	0
ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive potential common shares	223,448	0

Net Income (Loss) Per Share - N

Net Income (Loss) Per Share - Narrative (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)$ / shares
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Number of days following the effective date of an initial public offering	61 days
Number of contractual preceding days in determining conversion price	20 days
Class A Common Stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Stated value of convertible security | $	$ 40
Conversion price multiple | $ / shares	$ 0.8

Income Taxes - Summary Of Net I

Income Taxes - Summary Of Net Income (Loss) Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S.	$ (118,296)	$ 149,797	$ (286,809)
Foreign	(17,410)	(23,563)	46,550
Net income (loss) before income tax	$ (135,706)	$ 126,234	$ (240,259)

Income Taxes - Summary Of Provi

Income Taxes - Summary Of Provision for Benefit From Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal					$ 20,162	$ 23,703	$ 16,905
State					4,087	1,888	689
Foreign					4,027	568	1,329
Total current					28,276	26,159	18,923
Deferred:
Federal					(29,235)	(720)	993
State					(4,800)	(99)	(31)
Foreign					(4,013)	(18,146)	(149)
Total defferd					(38,048)	(18,965)	813
Total provision for (benefit from) income taxes	$ 16,933	$ (4,485)	$ 13,767	$ (2,324)	$ (9,772)	$ 7,194	$ 19,736

Income Taxes - Summary Of Recon

Income Taxes - Summary Of Reconciliation Of Federal Statutory Income Tax Rate To The Effective Income Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax provision (benefit) at U.S. federal statutory rate					$ (28,498)	$ 26,509	$ (50,454)
State income taxes, net of federal benefit					(1,137)	1,412	539
Foreign income taxed at different rates					8,710	2,887	(9,690)
Change in foreign deferred tax rate					(6,038)	(17,143)	0
Stock-based compensation					10,347	1,671	830
Foreign-derived intangible income					(3,518)	(8,600)	(6,246)
Research and development credits					(2,561)	(1,025)	(933)
Transaction costs					601	428
Extinguishments of acquisition-related contingent consideration					12,237	0
Effect of the Tax Act—transition tax					0	0	1,074
Global intangible low-taxed income					0	0	7,453
Note premium costs					0	0	67,018
Warrant Expense					0	0	12,259
Other					85	1,055	(2,114)
Total provision for (benefit from) income taxes	$ 16,933	$ (4,485)	$ 13,767	$ (2,324)	$ (9,772)	$ 7,194	$ 19,736

Income Taxes - Summary Of Curre

Income Taxes - Summary Of Current And Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Accrued expenses and reserves	$ 4,757	$ 1,871
Stock-based compensation	1,955	1,134
Tax credit carryforwards	2,526	183
Federal benefit from state taxes	1,047	553
Net operating loss	3,787	2,959
Interest rate swap	0	1,171
Embedded derivative	(1,303)	0
Identified intangibles	8,996	6,028
Operating Lease Liability	20,551	3,785
Valuation allowance	(531)	0
Total deferred tax assets	41,785	17,684
Deferred tax liabilities:
Depreciation and amortization	(6,857)	(8,419)
Operating lease right-of-use assets	(20,345)	(3,270)
Total deferred tax liabilities	(27,202)	(11,689)
Net deferred tax assets	$ 14,583	$ 5,995

Income Taxes - Summary Of Activ

Income Taxes - Summary Of Activity Related To The Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 6,646	$ 2,858
Increases related to prior year positions	4,681	2,377
Increases related to current year positions	3,498	1,581
Decreases related to lapse of statutes	(424)	(170)
Balance at end of year	$ 14,401	$ 6,646

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Deferred tax liability associated with basis differences in discontinued operation			$ 17,100
Federal corporate income tax rate		21.00%
Valuation allowance increase amount	$ 500
Undistributed earnings of foreign subsidiaries	0		0	$ 0
Unrecognized tax benefits	14,401		6,646	2,858
Unrecognized tax benefits that would impact effective tax rate	13,000		5,800
Interest and penalties related to unrecognised tax benefits	$ 2,300		700	$ 300
Maximum
Limitations on the amount of taxable income that can be offset by net operating loss carryforwards and tax credits Percentage of change in control in ownership	50.00%
California
Operating loss carryforwards,Expiration year	2037
Internal Revenue Service (IRS)
Operating loss carryforwards limitations on use	Internal Revenue Code Section 382 places a limitation on the amount of taxable income that can be offset by net operating loss carryforwards and tax credits after a greater than 50% change in control in ownership; California has similar rules.
Not Subject to Expiration | California
Tax credit carryforwards	$ 4,800		1,400
Tax Period Two Thousand And Thirty Seven | California
Operating loss carryforwards net	9,200		3,800
Tax Period Two Thousand Fourty | Texas Tax Authority
Tax credit carryforwards	$ 300		0
Tax credit carryforwards,Expiration year	2040
Tax Year 2017
Open tax year	2017
Tax Year 2020
Open tax year	2020
Domestic Tax Authority
Tax credit carryforwards,Expiration year	2035
Domestic Tax Authority | Not Subject to Expiration
Operating loss carryforwards net	$ 19,600		2,800
Domestic Tax Authority | Tax Period Two Thousand Thirty Five
Tax credit carryforwards	$ 900		$ 0
Domestic Tax Authority | Tax Year 2020
Open tax year	2020
Domestic Tax Authority | Tax Year 2016
Open tax year	2016

Defined Contribution Plan - Nar

Defined Contribution Plan - Narrative (Details) - Four Hundred And One K Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined contribution plan, Maximum annual contributions per employee, Percent	100.00%	100.00%
Defined contribution plan, Employer discretionary contribution amount	$ 2.2	$ 0.9
First 1% contribution [Member]
Defined contribution plan, Employer matching contribution, Percent of employee gross pay	1.00%	1.00%
Defined contribution plan, Employer matching contribution, Percent of match	100.00%	100.00%
Maximum of 6% contribution [Member]
Defined contribution plan, Employer matching contribution, Percent of employee gross pay	6.00%	6.00%
Defined contribution plan, Employer matching contribution, Percent of match	50.00%	50.00%

Geographic Information - Summar

Geographic Information - Summary Of Property And Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property and equipment, net	$ 62,910	$ 28,587	$ 7,901	$ 8,527
United States
Property and equipment, net		27,942	7,679	8,295
All Other Countries
Property and equipment, net		$ 645	$ 222	$ 232

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Feb. 12, 2021	Nov. 30, 2020	May 06, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Fair value of the shares purchased						$ 14,000
Interest rate						2.00%
Repurchases of common stock from related parties financed by promissory notes						$ 9,074
Percentage of principal amount discounted						19.00%
Line of credit non current outstanding	$ 400,000
Affiliated Entity [Member] | K K R Capital Markets L L C [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party				$ 1,500
Unsecured Debt
Related Party Transaction [Line Items]
Debt instrument, Term						5 years
Issuance Of First Unsecured Debt | Unsecured Debt
Related Party Transaction [Line Items]
Long term note payable issued for shares repurchased						$ 10,000
Issuance Of Second Unsecured Debt | Unsecured Debt
Related Party Transaction [Line Items]
Long term note payable issued for shares repurchased						$ 1,200
Class A Common Stock | Chief Executive Officer
Related Party Transaction [Line Items]
Number of shares repurchased by the company						2,475,000
Class A Common Stock | Director
Related Party Transaction [Line Items]
Number of shares repurchased by the company						300,000
Fifth Amendment Term Loan And Revolving Credit Facility
Related Party Transaction [Line Items]
Debt issuance costs paid to related party		$ 800			$ 1,500	$ 2,000	$ 6,500
Amended Revolving Credit Facility
Related Party Transaction [Line Items]
Proceeds from long term line of credit facility	250,000
Line of credit facility maximum borrowing capacity	$ 600,000		$ 150,000
Interest rate			2.50%

Subsequent Events - Narrative (

Subsequent Events - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands

Oct. 25, 2021

Apr. 20, 2021

Feb. 12, 2021

Feb. 01, 2021

Mar. 31, 2018

Oct. 31, 2021

Aug. 31, 2021

Feb. 28, 2021

Jan. 31, 2021

Sep. 30, 2021

Jun. 30, 2021

Sep. 30, 2020

Dec. 31, 2022

Dec. 31, 2020

Dec. 31, 2019

Dec. 31, 2018

Mar. 31, 2021

Nov. 30, 2020

Oct. 27, 2020

Aug. 15, 2018

Subsequent Event [Line Items]

Employee promissory note settled in shares

$ 17,200

Employee promissory note settled in cash

3,700

Consideration paid

$ 19,800

Number of options vested

21,000

Number of share options exercised

185,000

871,668

1,011,873

Convertible Preferred Stock, Percentage Converted

50.00%

Convertible security stated value

$ 20,000

Issuance of common stock warrants and options in connection with an acquisition (in shares)

405,205

Conversion price (in dollars per share)

$ 49.4

Common Stock

Subsequent Event [Line Items]

Issuance of common stock warrants and options in connection with an acquisition (in shares)

405,205

6,320,688

2,479,996

Adjust Gmbh [Member]

Subsequent Event [Line Items]

Total consideration

$ 967,817

Consideration paid

$ 578,000

Mo Pub [Member] | Forecast [Member]

Subsequent Event [Line Items]

Consideration paid

$ 1,050,000

Promissory notes [Member]

Subsequent Event [Line Items]

Employee promissory note settled

20,900

Amended Revolving Credit Facility [member]

Subsequent Event [Line Items]

Line of credit facility maximum borrowing capacity

$ 600,000

$ 150,000

Lender commitment under the line of credit

$ 10,000

$ 540,000

$ 50,000

Amended Revolving Credit Facility [member] | Affiliate Of KKR Denali [member]

Subsequent Event [Line Items]

Line of credit facility maximum borrowing capacity

$ 600,000

600,000

Fifth Amendment Term Loan And Revolving Credit Facility [member]

Subsequent Event [Line Items]

Debt issuance costs paid to related party

$ 800

$ 1,500

$ 2,000

$ 6,500

Common Class A [Member]

Subsequent Event [Line Items]

Number of shares recognized cost (in shares)

60,968

Common Class A [Member] | Common Stock

Subsequent Event [Line Items]

Issuance of common stock warrants and options in connection with an acquisition (in shares)

405,205

2,479,996

3,267,792

4,754,130

Subsequent Event [Member]

Subsequent Event [Line Items]

Consideration paid

$ 598,000

Convertible Preferred Stock, Percentage Converted

50.00%

Convertible security stated value

$ 20,000

Conversion price (in dollars per share)

$ 61.7

Subsequent Event [Member] | Acquisition of certain mobile game apps [Member]

Subsequent Event [Line Items]

Payment of asset acquisition consideration

$ 90,000

$ 60,000

Subsequent Event [Member] | Adjust Gmbh [Member]

Subsequent Event [Line Items]

Total consideration

1,000,000

Subsequent Event [Member] | Promissory notes [Member]

Subsequent Event [Line Items]

Employee promissory note settled

20,900

Subsequent Event [Member] | Amended Revolving Credit Facility [member]

Subsequent Event [Line Items]

Line of credit facility maximum borrowing capacity

$ 600,000

Lender commitment under the line of credit

10,000

Subsequent Event [Member] | Amendment Term Loan [Member]

Subsequent Event [Line Items]

Debt instrument, Increase decrease in face amount

300,000

New term loan

1,820,000

Subsequent Event [Member] | Fifth Amendment Term Loan And Revolving Credit Facility [member]

Subsequent Event [Line Items]

Debt issuance costs paid to related party

$ 800

Subsequent Event [Member] | Sixth Amendment Term Loan [Member]

Subsequent Event [Line Items]

New term loan

$ 1,500,000

Subsequent Event [Member] | Sixth Amendment Term Loan [Member] | K K R Capital Markets L L C [Member]

Subsequent Event [Line Items]

Debt issuance costs paid to related party

$ 1,400

Subsequent Event [Member] | Common Class A [Member] | Common Stock

Subsequent Event [Line Items]

Issuance of common stock warrants and options in connection with an acquisition (in shares)

324,156

Subsequent Event [Member] | Common Class A [Member] | Adjust Gmbh [Member]

Subsequent Event [Line Items]

Business combination number of days determining volume weighted average trading price per share

15 days

Subsequent Event [Member] | Convertible Securities Convertible into Class A Common Stock [Member] | Adjust Gmbh [Member]

Subsequent Event [Line Items]

Stated value of share settled liability

$ 352,000

Subsequent Events (Unaudited) -

Subsequent Events (Unaudited) - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Nov. 30, 2020
Subsequent Event [Line Items]
Business combination, equity interests issued and issuable			$ 0	$ 38,167	$ 38,167	$ 192
Common stock shares issued			373,641,135		226,364,401
Common stock shares outstanding			373,641,135		226,364,401
Amended Revolving Credit Facility [member]
Subsequent Event [Line Items]
Proceeds from long term line of credit facility	$ 250,000
Line of credit facility maximum borrowing capacity	600,000						$ 150,000
Common Class C [Member]
Subsequent Event [Line Items]
Common stock shares issued			0		0
Common stock shares outstanding			0		0
Subsequent Event [Member] | Further Amended Share Purchase Agreement [Member]
Subsequent Event [Line Items]
Business combination, equity interests issued and issuable		$ 352,000
Subsequent Event [Member] | Amended Revolving Credit Facility [member]
Subsequent Event [Line Items]
Proceeds from long term line of credit facility	250,000
Line of credit facility maximum borrowing capacity	$ 600,000