CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2020	$ 220,039	$ 4	$ 394,963	$ (174,740)	$ (188)
Beginning balance, Shares at Dec. 31, 2020		38,120,606
Issuance of common stock upon exercise of stock options	96		96
Issuance of common stock upon exercise of stock options, shares		26,599
Stock-based compensation	2,756		2,756
Vesting of early exercised common stock options	42		42
Other comprehensive loss	(39)				(39)
Net loss	(27,674)			(27,674)
Ending balance at Mar. 31, 2021	195,220	$ 4	397,857	(202,414)	(227)
Ending balance, Shares at Mar. 31, 2021		38,147,205
Beginning balance at Dec. 31, 2021	184,731	$ 4	487,347	(303,072)	452
Beginning balance, Shares at Dec. 31, 2021		42,690,229
Issuance of common stock upon exercise of stock options	10		10
Issuance of common stock upon exercise of stock options, shares		4,966
Stock-based compensation expense related to employee stock awards	3,480		3,480
Stock-based compensation expense related to employee stock purchases	444		444
Vesting of early exercised common stock options	84		84
Other comprehensive loss	(248)				(248)
Net loss	(35,615)			(35,615)
Ending balance at Mar. 31, 2022	$ 152,886	$ 4	$ 491,365	$ (338,687)	$ 204
Ending balance, Shares at Mar. 31, 2022		42,695,195