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- Average Remaining Useful Life (Years)		As of December 31, 2019							As of December 31, 2020
			Gross Carrying Value		Accumulated Amortization			Net Book Value		Gross Carrying Value		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 September 30,				Nine Months Ended September 30,
	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