Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Redeemable Convertible Preferred Stock
Mezzanine equity, beginning balance (in shares) at Dec. 31, 2020						93,328,118
Mezzanine equity, beginning balance at Dec. 31, 2020						$ 249,962
Increase (Decrease) in Temporary Equity [Roll Forward]
Pre-closing stock repurchase, net of exercise of vested options (in shares)						(206,511)
Pre-closing stock repurchase, net of exercise of vested options						$ (125)
Conversion of redeemable convertible preferred stock to common stock (in shares)						(93,121,607)
Conversion of redeemable convertible preferred stock to common stock						$ (249,837)
Mezzanine equity, ending balance (in shares) at Mar. 31, 2021						0
Mezzanine equity, ending balance at Mar. 31, 2021						$ 0
Beginning balance (in shares) at Dec. 31, 2020		52,967,106
Beginning balance at Dec. 31, 2020	$ (146,874)	$ 5	$ 24,424	$ (11)	$ (171,292)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Pre-closing stock repurchase, net of exercise of vested options (in shares)		(1,817,519)
Pre-closing stock repurchase, net of exercise of vested options	(21,902)		(21,902)
Conversion of redeemable convertible preferred stock to common stock (in shares)		93,121,607
Conversion of redeemable convertible preferred stock to common stock	249,837	$ 9	249,828
Repayment of related-party promissory notes associated with vested shares	854		854
Forfeiture of related-party promissory notes (in shares)		(370,734)
Conversion of Series D preferred stock warrants to Class A common warrants	1,160		1,160
Exercise of Class A common stock warrants (in shares)		1,867,292
Exercise of Class A common stock warrants	21,678		21,678
Issuance of common stock upon Merger, net of transaction costs of $16.2 million (in shares)		23,892,244
Issuance of common stock upon Merger, net of transaction costs of $16.2 million	129,659	$ 2	129,657
Issuance of PIPE shares (in shares)		7,500,000
Issuance of PIPE shares	75,000	$ 1	74,999
Issuance of earn-out shares to common stockholders (in shares)		14,153,520
Issuance of earn-out shares to common stockholders	1	$ 1
Exercise of vested stock options (in shares)		37,887
Exercise of vested stock options	80		80
Vesting of early exercised stock options	54		54
Warrant expense in connection with Merger	154		154
Stock-based compensation	34,230		34,230
Other comprehensive income	(61)			(61)
Net loss	(51,404)				(51,404)
Ending balance (in shares) at Mar. 31, 2021		191,351,403
Ending balance at Mar. 31, 2021	292,466	$ 18	515,216	(72)	(222,696)
Mezzanine equity, beginning balance (in shares) at Dec. 31, 2021						0
Mezzanine equity, beginning balance at Dec. 31, 2021						$ 0
Mezzanine equity, ending balance (in shares) at Mar. 31, 2022						0
Mezzanine equity, ending balance at Mar. 31, 2022						$ 0
Beginning balance (in shares) at Dec. 31, 2021		204,791,986
Beginning balance at Dec. 31, 2021	334,619	$ 20	613,687	(137)	(278,951)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon vesting of RSUs, net of shares withheld for taxes (in shares)		320,296
Payments for taxes related to net share settlement of equity awards	(404)		(404)
Exercise of vested stock options (in shares)		768,727
Exercise of vested stock options	891	$ 1	890
Vesting of early exercised stock options	38		38
Stock-based compensation	9,009		9,009
Other comprehensive income	(186)			(186)
Net loss	(16,252)				(16,252)
Ending balance (in shares) at Mar. 31, 2022		205,881,009
Ending balance at Mar. 31, 2022	$ 327,715	$ 21	$ 623,220	$ (323)	$ (295,203)