Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Accumulated Deficit [Member]	Redeemable Convertible Preferred Stock [Member]	Common Class A [Member] Common Stock [Member]	Common Class B [Member] Common Stock [Member]
Beginning Balance, Temporary Equity, shares at Dec. 31, 2020					182,772,372
Beginning Balance, Temporary Equity Value at Dec. 31, 2020					$ 139,576
Beginning balance, shares at Dec. 31, 2020						355,296
Beginning Balance, Value at Dec. 31, 2020	$ (89,348)	$ 2,099		$ (91,447)
Issuance of Class A common stock upon exercise of options	342	342
Issuance of Class A common stock upon exercise of options, shares						113,683
Stock-based compensation	404	404
Net loss	(4,714)			(4,714)
Ending Balance, shares at Mar. 31, 2021						468,979
Ending Balance, Value at Mar. 31, 2021	(93,316)	2,845		(96,161)
Ending Balance, Temporary Equity , shares at Mar. 31, 2021					182,772,372
Ending Balance, Temporary Equity Value at Mar. 31, 2021					$ 139,576
Beginning balance, shares at Dec. 31, 2021						20,968,376	309,238
Beginning Balance, Value at Dec. 31, 2021	69,592	193,627		(124,056)		$ 21
Issuance of common stock from underwritten follow-on offering, net of offering costs, shares						5,742,026
Issuance of common stock from underwritten follow-on offering, net of offering costs	80,034	80,028				$ 6
Issuance of Class A common stock upon exercise of options	65	65
Issuance of Class A common stock upon exercise of options, shares						17,946
Issuance of common stock pursuant to employee stock purchase plan value	169	169
Issuance of common stock pursuant to employee stock purchase plan, shares						8,458
Issuance of common stock upon vesting of restricted stock, shares						19,429
Stock-based compensation	1,662	1,662
Unrealized loss on marketable securities	(12)		$ (12)
Net loss	(17,085)			(17,085)
Ending Balance, shares at Mar. 31, 2022						26,756,235
Ending Balance, Value at Mar. 31, 2022	$ 134,425	$ 275,551	$ (12)	$ (141,141)		$ 27	$ 309,238