CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Accumulated Deficit	Series B Preferred Stock	Series A Preferred Stock
Balance at Dec. 31, 2018	$ (30,622)		$ 858	$ 0	$ (31,480)
Temporary equity, Balance, Shares at Dec. 31, 2018							42,066,666
Temporary equity, Balance at Dec. 31, 2018							$ 52,204
Balance, Shares at Dec. 31, 2018		747,231
Issuance of Series B Preferred Stock, net of $330 issuance costs						$ 120,923
Issuance of Series B Preferred Stock, net of $330 issuance costs, Shares						14,877,697
Conversion of all Series A1 Preferred Stock to Series A3 Preferred Stock and issuance of additional shares of Series A3 Preferred Stock, Shares							2,453,987
Stock-based compensation	2,890		2,890
Issuance of common stock, upon vesting of restricted stock, Shares		1,352,509
Unrealized (loss) gain on available-for-sale securities	68			68
Net loss	(23,839)				(23,839)
Balance at Dec. 31, 2019	$ (51,503)		3,748	68	(55,319)
Temporary equity, Balance, Shares at Dec. 31, 2019	59,398,350					14,877,697	44,520,653
Temporary equity, Balance at Dec. 31, 2019	$ 173,127					$ 120,923	$ 52,204
Balance, Shares at Dec. 31, 2019		2,099,740
Initial public offering, net of underwriting discounts, commissions and offering costs	291,975	$ 2	291,973
Initial public offering, net of underwriting discounts, commissions and offering costs, Shares		18,687,500
Conversion of convertible preferred stock into common stock upon initial public offering	173,127	$ 5	173,122
Temporary equity conversion of convertible preferred stock into common stock upon initial public offering, Shares						(14,877,697)	(44,520,653)
Temporary equity conversion of convertible preferred stock into common stock upon initial public offering						$ (120,923)	$ (52,204)
Conversion of convertible preferred stock into common stock upon initial public offering, Shares		39,859,139
Stock-based compensation	9,429		9,429
Issuance of common stock, upon vesting of restricted stock, Shares		1,284,876
Unrealized (loss) gain on available-for-sale securities	(90)			(90)
Foreign currency translation adjustment	(90)			(90)
Net loss	(69,784)				(69,784)
Balance at Dec. 31, 2020	$ 353,064	$ 7	$ 478,272	$ (112)	$ (125,103)
Temporary equity, Balance, Shares at Dec. 31, 2020						0	0
Balance, Shares at Dec. 31, 2020		61,931,255