Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Accumulated other comprehensive income	Accumulated deficit	Series B	Series C
Beginning balance (in shares) at Dec. 31, 2018	33,668,075
Beginning balance at Dec. 31, 2018	$ 60,770
Convertible preferred stock
Issuance of convertible preferred stock, net (in shares)						11,751,154	19,420,124
Issuance of convertible preferred stock, net						$ 55,066	$ 84,737
Ending balance (in shares) at Dec. 31, 2019	64,839,353					22,917,726	19,420,124
Ending balance at Dec. 31, 2019	$ 200,573					$ 93,479	$ 84,737
Beginning balance (in shares) at Dec. 31, 2018		2,173,684
Beginning balance at Dec. 31, 2018	(15,542)	$ 1	$ 169	$ 0	$ (15,712)
Common stock
Grant of restricted common stock awards (in shares)		62,988
Stock-based compensation	3,643		3,643
Unrealized gains on investments	0
Net loss	$ (35,258)				(35,258)
Ending balance (in shares) at Dec. 31, 2019	2,236,672	2,236,672
Ending balance at Dec. 31, 2019	$ (47,157)	$ 1	3,812	0	(50,970)
Convertible preferred stock
Conversion of preferred stock to common stock upon closing of the initial public offering (in shares)	(64,839,353)
Conversion of preferred stock to common stock upon closing of the initial public offering	$ (200,573)
Ending balance (in shares) at Dec. 31, 2020	0
Ending balance at Dec. 31, 2020	$ 0
Common stock
Conversion of preferred stock to common stock upon closing of the initial public offering (in shares)		21,499,770
Conversion of preferred stock to common stock upon closing of the initial public offering	200,573	$ 3	200,570
Issuance of common stock, net of issuance costs (in shares)		12,174,263
Issuance of common stock, net of issuance costs	212,101	$ 1	212,100
Reclassification of warrants to additional paid-in capital	$ 16		16
Exercise of common stock options (in shares)	160,509	160,509
Exercise of common stock options	$ 1,100		1,100
Vesting of restricted stock units (in shares)		6,664
Stock-based compensation (in shares)		505
Stock-based compensation	7,765		7,765
Unrealized gains on investments	614			614
Net loss	$ (67,254)				(67,254)
Ending balance (in shares) at Dec. 31, 2020	36,078,383	36,078,383
Ending balance at Dec. 31, 2020	$ 307,758	$ 5	$ 425,363	$ 614	$ (118,224)