Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Series A Redeemable Convertible Preferred Stock	Series B Redeemable Convertible Preferred Stock	Common Stock	Common Stock Private Placement	Additional Paid in Capital	Additional Paid in Capital Private Placement	Other Comprehensive Income / (Loss)	Accumulated Deficit
Beginning balance at Dec. 31, 2018	$ (32,626)			$ 3		$ 245		$ (49)	$ (32,825)
Beginning balance, shares at Dec. 31, 2018		9,008,919	9,152,108
Beginning balance at Dec. 31, 2018		$ 17,178	$ 86,868
Beginning balance, shares at Dec. 31, 2018				3,412,366
Conversion of redeemable convertible preferred stock to common stock	104,994			$ 18		104,976
Conversion of redeemable convertible preferred stock to common stock, shares		(9,008,919)	(9,152,108)
Conversion of redeemable convertible preferred stock to common stock		$ (17,178)	$ (87,816)
Conversion of redeemable convertible preferred stock to common stock, shares				18,161,027
Vesting of Series B redeemable convertible preferred stock in lieu of rent			$ 948
Initial public offering of common stock, net of issuance costs	77,827			$ 5		77,822
Initial public offering of common stock, net of issuance costs, shares				5,073,800
Exercise of stock options	97			$ 1		96
Exercise of stock options, shares				194,279
Stock based compensation	2,056					2,056
Exercise of stock warrant	1					1
Exercise of stock warrant, shares				27,941
Foreign currency translation adjustments	0
Unrealized gain (loss) on available for sale investments	109							109
Net loss	(36,980)								(36,980)
Ending balance at Dec. 31, 2019	115,478			$ 27		185,196		60	(69,805)
Ending balance, shares at Dec. 31, 2019				26,869,413
Initial public offering of common stock, net of issuance costs	117,628				$ 2		$ 117,626
Initial public offering of common stock, net of issuance costs, shares					2,500,000
Exercise of stock options	1,282					1,282
Exercise of stock options, shares				173,809
Stock based compensation	14,470					14,470
Foreign currency translation adjustments	0
Unrealized gain (loss) on available for sale investments	253							253
Net loss	(76,849)								(76,849)
Ending balance at Dec. 31, 2020	172,262			$ 29		318,574		313	(146,654)
Ending balance, shares at Dec. 31, 2020				29,543,222
Exercise of stock options	6,808			$ 1		6,807
Exercise of stock options, shares				531,190
Stock based compensation	29,853					29,853
Foreign currency translation adjustments	20							20
Unrealized gain (loss) on available for sale investments	(412)							(412)
Net loss	(89,945)								(89,945)
Ending balance at Dec. 31, 2021	$ 118,586			$ 30		$ 355,234		$ (79)	$ (236,599)
Ending balance, shares at Dec. 31, 2021				30,074,412