Condensed Consolidated Statements of Redeemable Noncontrolling Interest and Stockholders’ Equity (Deficit) - USD ($) $ in Thousands	Total	IPO	Class A, Class B and Class F Common Stock	Class A, Class B and Class F Common Stock IPO	Additional Paid-In Capital	Additional Paid-In Capital IPO	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Redeemable Noncontrolling Interest	Convertible Preferred Stock Preferred Stock	Convertible Preferred Stock Preferred Stock IPO
Balance at beginning of period at Dec. 31, 2019									$ 0
Balance at end of period at Mar. 31, 2020									0
Balance at beginning of period (in shares) at Dec. 31, 2019			220,157,922							109,090,908
Balance at beginning of period at Dec. 31, 2019	$ (256,567)		$ 7		$ 235,190		$ (4,140)	$ (887,213)		$ 399,589
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercises and vesting of early exercised Class A common stock options (in shares)			442,503
Exercises and vesting of early exercised Class A common stock options	145				145
Repurchase of unvested Class A common stock related to early exercised stock (in shares)			(425,001)
Repurchase of Class A common stock (in shares)			(114,000)
Repurchase of Class A common stock	(760)				(760)
Stock-based compensation	3,462				3,462
Total other comprehensive loss, net	(1,903)						(1,903)
Net income (loss)	4,664							4,664
Balance at end of period (in shares) at Mar. 31, 2020			220,061,424							109,090,908
Balance at end of period at Mar. 31, 2020	(250,959)		$ 7		238,037		(6,043)	(882,549)		$ 399,589
Balance at beginning of period at Dec. 31, 2019									0
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income (loss)	546
Balance at end of period at Sep. 30, 2020									2,010
Balance at beginning of period (in shares) at Dec. 31, 2019			220,157,922							109,090,908
Balance at beginning of period at Dec. 31, 2019	(256,567)		$ 7		235,190		(4,140)	(887,213)		$ 399,589
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(106,415)
Balance at end of period (in shares) at Sep. 30, 2020			224,931,718							109,090,908
Balance at end of period at Sep. 30, 2020	(194,059)		$ 7		398,909		1,064	(993,628)		$ 399,589
Balance at beginning of period at Mar. 31, 2020									0
Increase (Decrease) in Temporary Equity [Roll Forward]
Acquisition of noncontrolling interest									2,556
Net income (loss)									(320)
Balance at end of period at Jun. 30, 2020									2,236
Balance at beginning of period (in shares) at Mar. 31, 2020			220,061,424							109,090,908
Balance at beginning of period at Mar. 31, 2020	(250,959)		$ 7		238,037		(6,043)	(882,549)		$ 399,589
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercises and vesting of early exercised Class A common stock options (in shares)			37,593
Exercises and vesting of early exercised Class A common stock options	117				117
Repurchase of Class A common stock (in shares)			(135,000)
Repurchase of Class A common stock	(1,006)				(1,006)
Issuance of common stock warrants and options in connection with an acquisition	39,040				39,040
Issuance of common stock warrants in connection with lease modification	433				433
Stock-based compensation	4,747				4,747
Total other comprehensive loss, net	2,551						2,551
Net income (loss)	(21,391)							(21,391)
Balance at end of period (in shares) at Jun. 30, 2020			219,964,017							109,090,908
Balance at end of period at Jun. 30, 2020	(226,468)		$ 7		281,368		(3,492)	(903,940)		$ 399,589
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income (loss)	226								(226)
Balance at end of period at Sep. 30, 2020									2,010
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercises and vesting of early exercised Class A common stock options (in shares)			2,487,705
Exercises and vesting of early exercised Class A common stock options	840				840
Issuance of common stock warrants and options in connection with an acquisition (in shares)			2,479,996
Issuance of common stock warrants and options in connection with an acquisition	106,133
Stock-based compensation	10,568				10,568
Total other comprehensive loss, net	4,556						4,556
Net income (loss)	(89,688)							(89,688)
Balance at end of period (in shares) at Sep. 30, 2020			224,931,718							109,090,908
Balance at end of period at Sep. 30, 2020	(194,059)		$ 7		398,909		1,064	(993,628)		$ 399,589
Balance at beginning of period at Dec. 31, 2020	309								309
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income (loss)									(54)
Balance at end of period at Mar. 31, 2021									255
Balance at beginning of period (in shares) at Dec. 31, 2020			226,364,401							109,090,908
Balance at beginning of period at Dec. 31, 2020	(158,545)		$ 7		453,655		604	(1,012,400)		$ 399,589
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercises and vesting of early exercised Class A common stock options (in shares)			1,232,156
Exercises and vesting of early exercised Class A common stock options	10,143				10,143
Repurchase of Class A common stock (in shares)			(214,509)
Stock-based compensation	29,667				29,667
Total other comprehensive loss, net	(721)						(721)
Net income (loss)	(10,521)							(10,521)
Balance at end of period (in shares) at Mar. 31, 2021			227,382,048							109,090,908
Balance at end of period at Mar. 31, 2021	(129,977)		$ 7		493,465		(117)	(1,022,921)		$ 399,589
Balance at beginning of period at Dec. 31, 2020	309								309
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income (loss)	149
Balance at end of period at Sep. 30, 2021	160								160
Balance at beginning of period (in shares) at Dec. 31, 2020			226,364,401							109,090,908
Balance at beginning of period at Dec. 31, 2020	(158,545)		$ 7		453,655		604	(1,012,400)		$ 399,589
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	4,080
Balance at end of period (in shares) at Sep. 30, 2021			373,641,135							0
Balance at end of period at Sep. 30, 2021	2,049,059		$ 11		3,084,928		(27,560)	(1,008,320)		$ 0
Balance at beginning of period at Mar. 31, 2021									255
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income (loss)									(59)
Balance at end of period at Jun. 30, 2021									196
Balance at beginning of period (in shares) at Mar. 31, 2021			227,382,048							109,090,908
Balance at beginning of period at Mar. 31, 2021	(129,977)		$ 7		493,465		(117)	(1,022,921)		$ 399,589
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercises and vesting of early exercised Class A common stock options (in shares)			1,020,588
Exercises and vesting of early exercised Class A common stock options	5,190				5,190
Exercise of warrant, net of shares withheld (in shares)			6,229,081
Repurchase of Class A common stock (in shares)			(390,000)
Issuance of common stock warrants and options in connection with an acquisition (in shares)			6,320,688
Issuance of common stock warrants and options in connection with an acquisition	342,170				342,170
Issuance of Class A common stock (in shares)			12,006
Issuance of Class A common stock in connection with initial public offering, net of issuance costs as adjusted for cost reimbursement (in shares)			22,500,000
Issuance of Class A common stock in connection with initial public offering, net of issuance costs as adjusted for cost reimbursement	1,747,971		$ 1		1,747,970
Conversion of preferred stock to common stock in connection with initial public offering (in shares)				109,090,908							(109,090,908)
Conversion of preferred stock to common stock in connection with initial public offering		$ 0		$ 3		$ 399,586					$ (399,589)
Stock-based compensation	26,852				26,852
Total other comprehensive loss, net	(9,188)						(9,188)
Net income (loss)	14,423							14,423
Balance at end of period (in shares) at Jun. 30, 2021			372,165,319							0
Balance at end of period at Jun. 30, 2021	1,997,441		$ 11		3,015,233		(9,305)	(1,008,498)		$ 0
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income (loss)	36								(36)
Balance at end of period at Sep. 30, 2021	160								$ 160
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercises and vesting of early exercised Class A common stock options (in shares)			991,787
Exercises and vesting of early exercised Class A common stock options	7,782				7,782
Issuance of common stock warrants and options in connection with an acquisition (in shares)			405,205
Issuance of common stock warrants and options in connection with an acquisition	25,000				25,000
Issuance of Class A common stock (in shares)			78,824
Issuance of common stock	2,503				2,503
Stock-based compensation	34,410				34,410
Total other comprehensive loss, net	(18,255)						(18,255)
Net income (loss)	178							178
Balance at end of period (in shares) at Sep. 30, 2021			373,641,135							0
Balance at end of period at Sep. 30, 2021	$ 2,049,059		$ 11		$ 3,084,928		$ (27,560)	$ (1,008,320)		$ 0