Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity/(Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Preferred Stock Series H Preferred Stock	Class A and Class B Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit	Non- controlling Interest
Beginning balance (in shares) at Dec. 31, 2020		337,235
Beginning balance at Dec. 31, 2020		$ 344,827
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of preferred stock (in shares)			11,889
Issuance of preferred stock			$ 534,286
Conversion of convertible preferred stock to common stock in connection with the direct listing (in shares)		(349,124)
Conversion of convertible preferred stock to common stock in connection with the direct listing		$ (879,113)
Ending balance (in shares) at Mar. 31, 2021		0
Ending balance at Mar. 31, 2021		$ 0
Balance beginning (Shares) at Dec. 31, 2020				201,327
Balance beginning at Dec. 31, 2020	$ (232,381)			$ 20	$ 239,792	$ 90	$ (492,290)	$ 20,007
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercises of stock option (in shares)				18,443
Issuance of common stock upon exercise of stock options	30,221			$ 2	30,219
Others						0
Stock- based compensation	50,744				50,744
Cumulative translation adjustments	0					0		0
Net loss	(136,103)						(134,217)	(1,886)
Conversion of convertible preferred stock to common stock in connection with the direct listing (in shares)				349,124
Conversion of convertible preferred stock to common stock in connection with the direct listing	879,113			$ 35	879,078
Balance ending (Shares) at Mar. 31, 2021				568,894
Balance ending at Mar. 31, 2021	591,594			$ 57	1,199,833	90	(626,507)	18,121
Beginning balance (in shares) at Dec. 31, 2021		0
Beginning balance at Dec. 31, 2021		$ 0
Ending balance (in shares) at Mar. 31, 2022		0
Ending balance at Mar. 31, 2022		$ 0
Balance beginning (Shares) at Dec. 31, 2021				585,878
Balance beginning at Dec. 31, 2021	$ 592,923			$ 58	1,568,638	62	(983,941)	8,106
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercises of stock option (in shares)	4,150			4,150
Issuance of common stock upon exercise of stock options	$ 10,176			$ 1	10,175			0
Issuance of common stock under Employee Stock Purchase Plan (in shares)				335
Issuance of common stock under ESPP	14,243				14,243
Release of restricted stock units (in shares)				1,808
Withholding taxes related to net share settlement of restricted stock units (in shares)				(3)
Withholding taxes related to net share settlement of restricted stock units	(150)				(150)
Exercise of common stock warrants (in shares)				30
Exercise of common stock warrants	102				102
Others (in shares)				(2)
Others	(102)				(102)
Stock- based compensation	112,295				112,295
Cumulative translation adjustments	(6)					(92)		86
Net loss	(162,020)						(160,202)	(1,818)
Conversion of convertible preferred stock to common stock in connection with the direct listing	0
Balance ending (Shares) at Mar. 31, 2022				592,196
Balance ending at Mar. 31, 2022	$ 567,461			$ 59	$ 1,705,201	$ (30)	$ (1,144,143)	$ 6,374