STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Gain (Loss)
Beginning Balance at Dec. 31, 2020	$ 289,776	$ 4	$ 456,196	$ (166,393)	$ (31)
Beginning Balance (in shares) at Dec. 31, 2020		36,672,415
Exercise of common stock options	16		16
Exercise of common stock options (in shares)		18,411
Stock-based compensation expense	2,744		2,744
Unrealized (loss) gain on investments	48				48
Net loss	(16,509)			(16,509)
Ending Balance at Mar. 31, 2021	276,075	$ 4	458,956	(182,902)	17
Ending Balance (in shares) at Mar. 31, 2021		36,690,826
Beginning Balance at Dec. 31, 2021	$ 272,976	$ 4	$ (103)	(245,108)
Beginning Balance (in shares) at Dec. 31, 2021	39,430,120	39,430,120	518,183
Exercise of common stock options	$ 16		$ 16
Exercise of common stock options (in shares)	8,482	8,482
Stock-based compensation expense	$ 3,945		3,945
Unrealized (loss) gain on investments	(699)				(699)
Net loss	(23,159)			(23,159)
Ending Balance at Mar. 31, 2022	$ 253,079	$ 4	$ 522,144	$ (268,267)	$ (802)
Ending Balance (in shares) at Mar. 31, 2022	39,438,602	39,438,602