CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Common Stock [Member] Subscription Agreement	Common Stock [Member] Private Placement [Member]	Common Stock [Member] Firm Commitment Offering	Common Stock [Member]	Additional Paid-in Capital [Member] Subscription Agreement	Additional Paid-in Capital [Member] Private Placement [Member]	Additional Paid-in Capital [Member] Firm Commitment Offering	Additional Paid-in Capital [Member]	Retained Earnings [Member]	LPC Program	Subscription Agreement	Private Placement [Member]	Firm Commitment Offering	Total
Balance at Dec. 31, 2019				$ 1,067				$ 521,314	$ (516,780)					$ 5,601
Balance (in shares) at Dec. 31, 2019				106,734,279
Increase (Decrease) in Stockholders' Equity
Stock compensation accrued and restricted stock awards granted (Note 15)				$ 3				856						859
Stock compensation accrued and restricted stock awards granted (Note 15) (in shares)				300,000
Shares issued under the at-the-market offering agreement, net (Note 15)				$ 9				214						223
Shares issued under the at-the-market offering agreement, net (Note 15) (in shares)				823,452
Shares issued under the Lincoln Park commitment purchase agreement, net (Note 15)				$ 9				207						216
Shares issued under the Lincoln Park commitment purchase agreement, net (Note 15) (in shares)				900,000
Stock Issued During Period Value New Issues	$ 47	$ 150	$ 205		$ 898	$ 2,561	$ 7,748				$ 945	$ 2,711	$ 7,953
Stock Issued During period Shares New Issues (in shares)	4,719,207	15,000,000	20,535,714							900,000
Warrants exercised				$ 85				2,465						2,550
Warrants exercised (in shares)				8,500,000
Net loss									(9,086)					(9,086)
Balance at Dec. 31, 2020				$ 1,575				536,263	(525,866)					11,972
Balance (in shares) at Dec. 31, 2020				157,512,652
Increase (Decrease) in Stockholders' Equity
Stock compensation accrued and restricted stock awards granted (Note 15)				$ 3				1,590						1,593
Stock compensation accrued and restricted stock awards granted (Note 15) (in shares)				335,000
Shares issued under the at-the-market offering agreement, net (Note 15)				$ 19				1,681						1,700
Shares issued under the at-the-market offering agreement, net (Note 15) (in shares)				1,856,960
Warrants exercised				$ 31				984						1,015
Warrants exercised (in shares)				3,100,000
Net loss									(2,095)					(2,095)
Balance at Dec. 31, 2021				$ 1,628				$ 540,518	$ (527,961)					$ 14,185
Balance (in shares) at Dec. 31, 2021				162,804,612