CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning Balance at Dec. 31, 2020	$ 321,220	$ 3	$ 439,235	$ 3	$ (118,021)
Beginning Balance, Shares at Dec. 31, 2020		32,627,963
Vesting of shares of common stock subject to repurchase	9		9
Vesting of shares of common stock subject to repurchase, Shares		15,802
Issuance of common stock upon exercise of stock options	756		756
Issuance of common stock upon exercise of stock options, Shares		154,489
Share-based compensation expense	3,347		3,347
Unrealized gain (loss) on short-term investments	31			31
Net loss	(19,373)				(19,373)
Ending Balance at Mar. 31, 2021	305,990	$ 3	443,347	34	(137,394)
Ending Balance, Shares at Mar. 31, 2021		32,798,254
Beginning Balance at Dec. 31, 2021	250,967	$ 3	455,210	(150)	(204,096)
Beginning Balance, Shares at Dec. 31, 2021		32,971,107
Vesting of shares of common stock subject to repurchase	6		6
Vesting of shares of common stock subject to repurchase, Shares		10,924
Issuance of common stock upon exercise of stock options	$ 79		79
Issuance of common stock upon exercise of stock options, Shares	21,067	21,067
Share-based compensation expense	$ 4,097		4,097
Unrealized gain (loss) on short-term investments	(456)			(456)
Net loss	(25,987)				(25,987)
Ending Balance at Mar. 31, 2022	$ 228,706	$ 3	$ 459,392	$ (606)	$ (230,083)
Ending Balance, Shares at Mar. 31, 2022		33,003,098