Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Balance at Dec. 31, 2020	$ 22,569	$ 51	$ 220,307	$ (197,789)
Balance, Shares at Dec. 31, 2020		50,821,361
Issuance of common stock, net of issuance costs	11,703	$ 6	11,697
Issuance of common stock, net of issuance costs, shares		6,058,318
Stock-based compensation	867		867
Net loss	(11,636)			(11,636)
Balance at Mar. 31, 2021	23,503	$ 57	232,871	(209,425)
Balance, Shares at Mar. 31, 2021		56,879,679
Balance at Dec. 31, 2021	$ 18,868	$ 83	265,237	(246,452)
Balance, Shares at Dec. 31, 2021	82,969,421	82,969,421
Issuance of common stock, net of issuance costs	$ 3,944	$ 7	3,937
Issuance of common stock, net of issuance costs, shares		6,804,888
Stock-based compensation	617		617
Net loss	(11,813)			(11,813)
Balance at Mar. 31, 2022	$ 11,616	$ 90	$ 269,791	$ (258,265)
Balance, Shares at Mar. 31, 2022	89,774,309	89,774,309