CONSOLIDATED STATEMENTS OF MEZZANINE EQUITY AND STOCKHOLDERS’ (DEFICIT) EQUITY - USD ($) $ in Thousands		Total	Redeemable convertible preferred stock	Series E	Series F	Series G	Common stock		Additional paid-in capital	Accumulated other comprehensive income	Accumulated deficit
Balance at beginning of period, redeemable convertible preferred stock (in shares) at Dec. 31, 2018			291,739,421
Balance at beginning of period, redeemable convertible preferred stock at Dec. 31, 2018			$ 539,678
Increase (decrease) in mezzanine equity
Issuance of convertible preferred stock, net of issuance costs (in shares)				29,887,357
Issuance of convertible preferred stock, net of issuance costs				$ 372,733
Balance at end of period, redeemable convertible preferred stock (in shares) at Dec. 31, 2019			321,626,778
Balance at end of period, redeemable convertible preferred stock at Dec. 31, 2019			$ 912,411
Balance at beginning of period, common stock (in shares) at Dec. 31, 2018							220,339,931
Balance at beginning of period at Dec. 31, 2018		$ (21,482)					$ 1		$ 68,615	$ 10	$ (90,108)
Increase (decrease) in stockholder's equity
Net income (loss)		(106,569)									(106,569)
Shares issued in connection with stock option exercise, net of repurchases (in shares)							4,462,614
Shares issued in connection with stock option exercise, net of repurchases		2,291							2,291
Vesting of early-exercised stock options		1,205							1,205
Change in other comprehensive income		179								179
Share-based compensation		27,328							27,328
Balance at end of period, common stock (in shares) at Dec. 31, 2019							224,802,545
Balance at end of period at Dec. 31, 2019		$ (97,048)					$ 1		99,439	189	(196,677)
Increase (decrease) in mezzanine equity
Issuance of convertible preferred stock, net of issuance costs (in shares)					48,000,000	43,116,119
Issuance of convertible preferred stock, net of issuance costs					$ 599,284	$ 668,044
Balance at end of period, redeemable convertible preferred stock (in shares) at Dec. 31, 2020		412,742,897	412,742,897	29,887,357	48,000,000	43,116,119
Balance at end of period, redeemable convertible preferred stock at Dec. 31, 2020		$ 2,179,739	$ 2,179,739	$ 372,733	$ 599,284	$ 668,044
Increase (decrease) in stockholder's equity
Net income (loss)		7,449									7,449
Shares issued in connection with stock option exercise, net of repurchases (in shares)							4,229,001
Shares issued in connection with stock option exercise, net of repurchases		8,540							9,415		(875)
Vesting of early-exercised stock options		527							527
Change in other comprehensive income		284								284
Share-based compensation		$ 24,926							24,926
Balance at end of period, common stock (in shares) at Dec. 31, 2020		229,031,546					229,031,546	[1]
Balance at end of period at Dec. 31, 2020		$ (55,322)					$ 1	[1]	134,307	473	(190,103)
Balance at end of period, redeemable convertible preferred stock (in shares) at Dec. 31, 2021		0	0
Balance at end of period, redeemable convertible preferred stock at Dec. 31, 2021		$ 0	$ 0
Increase (decrease) in stockholder's equity
Net income (loss)		(3,686,432)								0	(3,686,432)
Shares issued in connection with stock option exercise, net of repurchases (in shares)	[1]						6,832,725
Shares issued in connection with stock option exercise, net of repurchases		13,681					$ 24	[1]	13,657
Shares issued in connection with employee stock plans (in shares)	[1]						298,031
Issuance of common stock in connection with Employee Stock Purchase Plan		7,344							7,344
Issuance of common stock in connection with initial public offering, net of issuance costs (in shares)	[1]						56,729,194
Issuance of common stock in connection with initial public offering, net of issuance costs		2,052,331					$ 6	[1]	2,052,325
Issuance of common stock upon settlement of restricted stock units, net of shares withheld (in shares)	[1]						32,133,589
Shares withheld related to net share settlement (in shares)							(11,160,525)
Shares withheld related to net share settlement		(422,076)							(422,076)
Conversion of preferred stock to common stock (in shares)			(412,742,897)				412,742,897
Conversion of preferred stock to common stock		2,179,739	$ (2,179,739)				$ 41		2,179,698
Conversion of convertible notes to common stock (in shares)							137,305,156
Conversion of convertible notes to common stock		5,217,597					$ 14		5,217,583
Reclassification of warrant liability to stockholders' equity		380,036							380,036
Vesting of replacement awards issued in connection with acquisition of a business		639							639
Vesting of early-exercised stock options		406							406
Change in other comprehensive income		(68)								(68)
Share-based compensation		$ 1,605,217							1,605,217
Balance at end of period, common stock (in shares) at Dec. 31, 2021		0					863,912,613	[1]
Balance at end of period at Dec. 31, 2021		$ 7,293,092					$ 86	[1]	$ 11,169,136	$ 405	$ (3,876,535)

[1] The share amounts listed above combine common stock, Class A common stock and Class B common stock. In connection with the completion of our initial public offering, all previously outstanding shares of common stock were reclassified into Class A common stock and Class B common stock. See Note 1 for further information.