Condensed Consolidated Statements Of Shareholders' Deficit - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Deficit [Member]	Total
Balance, value at Dec. 31, 2020	$ 586	$ (1,126)	$ 376,954	$ 279	$ (421,361)	$ (43,821)
Issuance of common stock and warrants in public and private offerings, net of issuance costs and initial fair value of contingent payment rights	62		4,712
Issuance of common stock upon exercise of options and warrants	52		770
Issuance of common stock and warrants for services	7		621
Issuance of common stock upon conversion and payment of interest-in-kind on convertible debt	18		527
Share-based compensation, net of shares withheld for taxes	2		1,821
Comprehensive loss for the period					(6,873)	(6,873)
Balance, value at Jun. 30, 2021	727		384,279		(427,955)	(42,949)
Balance, value at Mar. 31, 2021	699		382,761		(423,549)	(40,089)
Issuance of common stock and warrants in public and private offerings, net of issuance costs and initial fair value of contingent payment rights			(22)
Issuance of common stock upon exercise of options and warrants	25		373
Issuance of common stock and warrants for services	1		230
Issuance of common stock upon conversion and payment of interest-in-kind on convertible debt	1		68
Share-based compensation, net of shares withheld for taxes	1		869
Comprehensive loss for the period					(4,406)	(4,406)
Balance, value at Jun. 30, 2021	727		384,279		(427,955)	(42,949)
Balance, value at Dec. 31, 2021	770		387,865		(433,412)	(44,777)
Issuance of common stock and warrants in public and private offerings, net of issuance costs and initial fair value of contingent payment rights			(18)
Issuance of common stock upon exercise of options and warrants	5		78
Issuance of common stock upon conversion and payment of interest-in-kind on convertible debt	7		131
Share-based compensation, net of shares withheld for taxes			1,491
Comprehensive loss for the period					(4,066)	(4,066)
Balance, value at Jun. 30, 2022	782		389,547		(437,478)	(47,149)
Balance, value at Mar. 31, 2022	778		388,749		(433,080)	(43,553)
Issuance of common stock upon exercise of options and warrants			1
Issuance of common stock upon conversion and payment of interest-in-kind on convertible debt	4		52
Share-based compensation, net of shares withheld for taxes			745
Comprehensive loss for the period					(4,398)	(4,398)
Balance, value at Jun. 30, 2022	$ 782		$ 389,547		$ (437,478)	$ (47,149)