Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2020	$ 27,282	$ 19	$ 174,240	$ (146,977)
Beginning Balance (in shares) at Dec. 31, 2020		18,546,786
Stock-based compensation	718		718
Issuance of common stock under the at-the-market sales agreement, net of commissions and allocated fees	4,056	$ 1	4,055
Issuance of common stock under the at-the-market sales agreement, net of commissions and allocated fees (in shares)		1,367,621
Net loss	(8,371)			(8,371)
Ending Balance at Mar. 31, 2021	23,685	$ 20	179,013	(155,348)
Ending Balance (in shares) at Mar. 31, 2021		19,914,407
Beginning Balance at Dec. 31, 2021	17,075	$ 29	197,963	(180,917)
Beginning Balance (in shares) at Dec. 31, 2021		28,505,804
Stock-based compensation	737		737
Issuance of common stock under the at-the-market sales agreement, net of commissions and allocated fees	(22)		(22)
Issuance of common stock from warrant exercise	2	$ 2
Issuance of common stock from warrant exercise (in shares)		2,300,000
Net loss	(7,329)			(7,329)
Ending Balance at Mar. 31, 2022	$ 10,463	$ 31	$ 198,678	$ (188,246)
Ending Balance (in shares) at Mar. 31, 2022		30,805,804