Unaudited Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance at Dec. 31, 2020	$ 89,279	$ 3	$ 210,021	$ 1	$ (120,746)
Balance, shares at Dec. 31, 2020		25,969,442
Stock-based compensation	1,520		1,520
Exercise of stock options	623		623
Exercise of stock options, shares		228,678
Vesting of common stock	8		8
Vesting of early exercised stock options, shares		11,207
Unrealized loss on available-for-sale securities, net	(2)			(2)
Net loss	(14,768)				(14,768)
Balance at Mar. 31, 2021	76,660	$ 3	212,172	(1)	(135,514)
Balance, shares at Mar. 31, 2021		26,209,327
Balance at Dec. 31, 2021	$ 57,355	$ 4	240,309	(5)	(182,953)
Balance, shares at Dec. 31, 2021	42,108,428	42,108,428
Stock-based compensation	$ 2,010		2,010
Vesting of common stock	$ 3		3
Vesting of early exercised stock options, shares	2,132	2,132
Vesting of restricted stock units, shares		52,950
Unrealized loss on available-for-sale securities, net	$ (38)			(38)
Net loss	(12,880)				(12,880)
Balance at Mar. 31, 2022	$ 46,450	$ 4	$ 242,322	$ (43)	$ (195,833)
Balance, shares at Mar. 31, 2022	42,163,510	42,163,510