CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Other Comprehensive Income
Beginning Balance at Dec. 31, 2020	$ 82,170	$ 3	$ 243,830	$ (161,664)	$ 1
Beginning Balance, Shares at Dec. 31, 2020		27,325,959
Net loss	(7,102)			(7,102)
Issuance of common stock upon exercise of stock options	9		9
Issuance of common stock upon exercise of stock options, Shares		2,500
Vesting of restricted stock	(81)		(81)
Vesting of restricted stock, Shares		26,994
Stock-based compensation	521		521
Unrealized loss on short-term investments	(2)				(2)
Ending Balance at Mar. 31, 2021	75,515	$ 3	244,279	(168,766)	(1)
Ending Balance, Shares at Mar. 31, 2021		27,355,453
Beginning Balance at Dec. 31, 2021	56,470	$ 3	246,166	(189,698)	(1)
Beginning Balance, Shares at Dec. 31, 2021		27,366,707
Net loss	(7,731)			(7,731)
Issuance of common stock upon exercise of stock options	$ 21		21
Issuance of common stock upon exercise of stock options, Shares	4,781	4,781
Stock-based compensation	$ 636		636
Unrealized loss on short-term investments	(3)				(3)
Ending Balance at Mar. 31, 2022	$ 49,393	$ 3	$ 246,823	$ (197,429)	$ (4)
Ending Balance, Shares at Mar. 31, 2022		27,371,488