Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 726,951	$ 381,740	$ 1,999,634	$ 941,249
Costs and expenses:
Cost of revenue	254,052	163,060	722,966	357,564
Sales and marketing	285,224	153,014	816,200	417,000
Research and development	108,523	51,136	246,861	99,950
General and administrative	34,104	15,276	122,116	41,256
Lease modification and abandonment of leasehold improvements	0	0	0	7,851
Extinguishments of acquisition-related contingent consideration	0	74,712	0	74,712
Total costs and expenses	681,903	457,198	1,908,143	998,333
Income (loss) from operations	45,048	(75,458)	91,491	(57,084)
Other income (expense):
Interest expense and loss on settlement of debt	(18,756)	(20,110)	(72,796)	(57,548)
Other income (expense), net	(9,217)	1,169	(997)	5,347
Total other expense	(27,973)	(18,941)	(73,793)	(52,201)
Income (loss) before income taxes	17,075	(94,399)	17,698	(109,285)
Provision for (benefit from) income taxes	16,933	(4,485)	13,767	(2,324)
Net income (loss)	142	(89,914)	3,931	(106,961)
Add: Net loss attributable to noncontrolling interest	36	226	149	546
Net income (loss) attributable to AppLovin	178	(89,688)	4,080	(106,415)
Less: Net income attributable to participating securities	(1)	0	(568)	0
Net income (loss) attributable to common stock—Basic	177	(89,688)	3,512	(106,415)
Net income (loss) attributable to common stock—Diluted	$ 177	$ (89,688)	$ 3,539	$ (106,415)
Net income (loss) per share attributable to common stockholders:
Basic (in dollars per share)	$ 0.00	$ (0.42)	$ 0.01	$ (0.50)
Diluted (in dollars per share)	$ 0.00	$ (0.42)	$ 0.01	$ (0.50)
Weighted average common shares used to compute net income (loss) per share attributable to common stockholders:
Basic (in shares)	368,427,532	214,638,272	309,353,304	212,998,263
Diluted (in shares)	384,324,785	214,638,272	327,426,792	212,998,263