CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ DEFICIT - USD ($) $ in Thousands		Total	Redeemable convertible preferred stock		Common Stock		Additional Paid-in- Capital	Notes receivable from stockholders	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2019	[1]		4,384,348
Beginning balance at Dec. 31, 2019			$ 40,016
Ending balance (in shares) at Mar. 31, 2020	[1]		4,384,348
Ending balance at Mar. 31, 2020			$ 40,016
Beginning balance (in shares) at Dec. 31, 2019	[1]				7,902,407
Beginning balance at Dec. 31, 2019		$ (100,319)			$ 0		$ 2,320	$ (44)	$ (102,595)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	[1]	423
Issuance of common stock upon exercise of stock options		$ 2					2
Vesting of early exercised stock options		12					12
Stock-based compensation expense		175					175
Net loss		(18,693)							(18,693)
Reclassification of notes receivable from stockholders		44						44
Ending balance (in shares) at Mar. 31, 2020	[1]				7,902,830
Ending balance at Mar. 31, 2020		$ (118,779)					2,509	0	(121,288)
Beginning balance (in shares) at Dec. 31, 2020		88,434,754	88,434,754	[1]
Beginning balance at Dec. 31, 2020		$ 39,225	$ 39,225
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of redeemable convertible preferred stock upon exercise of warrant (in shares)	[1]		4,232,947
Issuance of redeemable convertible preferred stock upon exercise of warrants			$ 58,097
Conversion of redeemable convertible preferred stock to common stock (in shares)	[1]		(92,667,701)
Conversion of redeemable convertible preferred stock to common stock			$ (97,322)
Ending balance (in shares) at Mar. 31, 2021		0	0	[1]
Ending balance at Mar. 31, 2021		$ 0	$ 0
Beginning balance (in shares) at Dec. 31, 2020		33,327,294			33,327,294	[1]
Beginning balance at Dec. 31, 2020		$ (75,907)			$ 0		133,468	0	(209,375)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	[1]				727,114
Issuance of common stock upon exercise of stock options		190			$ 1		189
Repurchase of common stock (shares)	[1]				(220,561)
Repurchase of common stock		(43)					(43)
Conversion of redeemable convertible preferred stock to common stock (in shares)	[1]				92,667,701
Conversion of redeemable convertible preferred stock to common stock		$ 97,334			$ 12		97,322
Issuance of common stock upon merger and private offering, net of acquired private placement warrants of $19,377 (in shares)	[1]	34,947,657
Issuance of common stock upon merger and private offering, net of acquired private placement warrants of $19,377		$ 272,064			$ 3		272,061
Offering costs in connection with the merger		(26,620)					(26,620)
Vesting of early exercised stock options		438					438
Stock-based compensation expense		5,256					5,256
Net loss		$ (20,957)							(20,957)
Ending balance (in shares) at Mar. 31, 2021		161,449,205			161,449,205	[1]
Ending balance at Mar. 31, 2021		$ 251,755			$ 16		$ 482,071	$ 0	$ (230,332)

[1] The shares of the Company’s common and redeemable convertible preferred stock, prior to the Merger (as defined in Note 1), have been retroactively restated as shares reflecting the exchange ratio of approximately 0.703 established in the Merger as described in Note 1.