Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Total
Balances at Dec. 31, 2018	$ 22	$ 266,469	$ (274,601)	$ (8,110)
Balances (in shares) at Dec. 31, 2018	21,979,506
Issuance of common stock in exchange for services		83		83
Issuance of common stock in exchange for services (in shares)	21,972
Issuance of stock options for payment of compensation		207		207
Issuance of common stock for payment of compensation		137		137
Issuance of common stock for payment of compensation, shares	30,445
Issuance of warrant for services
Issuance of common stock upon option exercise		325		325
Issuance of common stock upon option exercise, shares	97,725
Convertible note beneficial conversion feature		143		143
Conversion of advance notes		981		981
Conversion of advance notes, shares	435,924
Issuance of common stock in connection with equity line of credit		185		185
Issuance of common stock in connection with equity line of credit, shares	241,318
Stock-based compensation expense		2,025		2,025
Net loss			(10,294)	(10,294)
Balances at Dec. 31, 2019	$ 22	270,555	(284,895)	(14,318)
Balances (in shares) at Dec. 31, 2019	22,806,890
Issuance of common stock, net of expenses	$ 27	139,733		139,760
Issuance of common stock, net of expenses, shares	25,745,744
Issuance of common stock for conversion of debt	$ 3	4,313		4,316
Issuance of common stock for conversion of debt, shares	2,397,916
Issuance of common stock in exchange for services		302		302
Issuance of common stock in exchange for services (in shares)	45,064
Issuance of stock options for payment of compensation		180		180
Issuance of common stock for payment of compensation		78		78
Issuance of common stock for payment of compensation, shares	17,317
Issuance of warrant for services		2,070		2,070
Issuance of common stock upon option exercise		572		572
Issuance of common stock upon option exercise, shares	390,668
Issance of common stock upon warrant exercise		10		10
Issance of common stock upon warrant exercise, shares	222,909
Stock-based compensation expense		2,110		2,110
Net loss			(89,535)	(89,535)
Balances at Dec. 31, 2020	$ 52	$ 419,923	$ (374,430)	$ 45,545
Balances (in shares) at Dec. 31, 2020	51,626,508