Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury stock [Member]	Accumulated deficit [Member]
Balance at Dec. 31, 2020	$ 10,230	$ 404	$ 183,250	$ (1,828)	$ (171,596)
Balance, shares at Dec. 31, 2020		40,157,187		(193,735)
Vesting of restricted stock units	(94)			$ (94)
Vesting of restricted stock units, shares		57,687		(23,883)
Stock-based compensation expense	1,308		1,308
Net loss	(8,694)				(8,694)
Balance at Mar. 31, 2021	2,750	$ 404	184,558	$ (1,922)	(180,290)
Balance, shares at Mar. 31, 2021		40,214,874		(217,618)
Balance at Dec. 31, 2021	$ 22,384	$ 871	262,026	$ (2,190)	(238,323)
Balance, shares at Dec. 31, 2021	86,649,958	86,649,958		(421,366)
Vesting of restricted stock units, shares		3,131
Stock-based compensation expense	$ 922		922
Net loss	(11,620)				(11,620)
Balance at Mar. 31, 2022	$ 11,686	$ 871	$ 262,948	$ (2,190)	$ (249,943)
Balance, shares at Mar. 31, 2022	86,653,089	86,653,089		(421,366)