CONDENSED STATEMENTS OF STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive (Loss) Income	Total
Balance, Value at Dec. 31, 2020	$ 50	$ 641,195	$ (392,317)	$ 73	$ 249,001
Balance, Shares at Dec. 31, 2020	49,872,213
Stock-based compensation expense		2,744			2,744
Shares issued upon exercise of stock options, value		688			688
Shares issued upon exercise of stock options, shares	45,035
Shares issued upon vesting of restricted stock units, value		1,388			1,388
Shares issued upon vesting of restricted stock units, shares	109,419
Net loss			(23,301)		(23,301)
Other comprehensive loss				(61)	(61)
Balance, Value at Mar. 31, 2021	$ 50	646,015	(415,618)	12	230,459
Balance, Shares at Mar. 31, 2021	50,026,667
Balance, Value at Dec. 31, 2021	$ 53	708,585	(480,758)	(358)	227,522
Balance, Shares at Dec. 31, 2021	53,480,812
Stock-based compensation expense		4,266			4,266
Shares issued upon exercise of stock options, value		3			3
Shares issued upon exercise of stock options, shares	470
Shares issued upon vesting of restricted stock units, value		1,438			1,438
Shares issued upon vesting of restricted stock units, shares	109,943
Net loss			(27,749)		(27,749)
Other comprehensive loss				(1,365)	(1,365)
Balance, Value at Mar. 31, 2022	$ 53	$ 714,292	$ (508,507)	$ (1,723)	$ 204,115
Balance, Shares at Mar. 31, 2022	53,591,225