Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Balance at Dec. 31, 2020	$ 74,492	$ 13	$ 224,363	$ (149,884)
Balance, Shares at Dec. 31, 2020		12,932,377
Exercise of common stock options	262		262
Exercise of common stock options, Shares		30,391
Stock-based compensation	599		599
Net loss	(7,802)			(7,802)
Balance at Mar. 31, 2021	67,551	$ 13	225,224	(157,686)
Balance, Shares at Mar. 31, 2021		12,962,768
Balance at Dec. 31, 2021	34,316	$ 13	227,700	(193,397)
Balance, Shares at Dec. 31, 2021		13,007,178
Exercise of common stock options	$ 8		8
Exercise of common stock options, Shares	2,718	2,718
Stock-based compensation	$ 844		844
Net loss	(11,911)			(11,911)
Balance at Mar. 31, 2022	$ 23,257	$ 13	$ 228,552	$ (205,308)
Balance, Shares at Mar. 31, 2022		13,009,896