CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (CAPITAL DEFICIENCY) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Beginning balance at Dec. 31, 2019	$ 15	$ 270,492	$ (340,829)	$ (70,322)
Beginning balance (in shares) at Dec. 31, 2019	14,838,213
Issuance of common stock and warrants, net of issuance cost	$ 18	41,325		41,343
Issuance of common stock and warrants, net of issuance cost (in shares)	17,604,423
Note receivable from issuance of common stock and warrants		(4,000)		(4,000)
Share-based compensation related to stock options		431		431
Net (loss) income for the period			1,667	1,667
Ending balance at Mar. 31, 2020	$ 33	308,248	(339,162)	(30,881)
Ending balance (in shares) at Mar. 31, 2020	32,442,636
Beginning balance at Dec. 31, 2020	$ 35	320,280	(347,352)	(27,037)
Beginning balance (in shares) at Dec. 31, 2020	34,765,280
Issuance of common stock, net of issuance cost	$ 9	37,616		37,625
Issuance of common stock, net of issuance cost (in shares)	8,749,999
Issuance of common stock under the Sales Agreement, net	$ 2	8,573		8,575
Issuance of common stock under the Sales Agreement, net (in shares)	1,867,552
Share-based compensation related to stock options		510		510
Share-based compensation related to restricted stock awards		306		306
Net (loss) income for the period			(5,475)	(5,475)
Ending balance at Mar. 31, 2021	$ 46	$ 367,285	$ (352,827)	$ 14,504
Ending balance (in shares) at Mar. 31, 2021	45,382,831