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 September 30,				Nine Months Ended September 30,
	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 September 30,				Nine Months Ended September 30,
	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 years
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