CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Common Stock Subscription Agreement	Common Stock Private Placement	Common Stock Firm Commitment Offering	Common Stock	Additional Paid-in Capital Subscription Agreement	Additional Paid-in Capital Private Placement	Additional Paid-in Capital Firm Commitment Offering	Additional Paid-in Capital	Accumulated Deficit	LPC Program [Member]	Subscription Agreement	Private Placement	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 (Note 15)								52						52
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
Net loss									(3,336)					(3,336)
Balance at Mar. 31, 2020				$ 1,085				521,787	(520,116)					2,756
Balance (in shares) at Mar. 31, 2020				108,457,731
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
Net loss														(6,945)
Balance at Sep. 30, 2020				$ 1,490				533,694	(523,725)					11,459
Balance (in shares) at Sep. 30, 2020				149,012,652
Balance at Mar. 31, 2020				$ 1,085				521,787	(520,116)					2,756
Balance (in shares) at Mar. 31, 2020				108,457,731
Increase (Decrease) in Stockholders' Equity
Stock compensation accrued (Note 15)								614						614
Stock Issued During Period Value New Issues	$ 47	$ 150			$ 882	$ 2,561					$ 929	$ 2,711
Stock Issued During period Shares New Issues	4,719,207	15,000,000
Net loss									(2,323)					(2,323)
Balance at Jun. 30, 2020				$ 1,282				525,844	(522,439)					4,687
Balance (in shares) at Jun. 30, 2020				128,176,938
Increase (Decrease) in Stockholders' Equity
Stock Issued During Period Value New Issues			$ 205				$ 7,748						$ 7,953
Stock Issued During period Shares New Issues			20,535,714
Stock compensation accrued and restricted stock awards granted (Note 15)				$ 3				102						105
Stock compensation accrued and restricted stock awards granted (Note 16)(in shares)				300,000
Net loss									(1,286)					(1,286)
Balance at Sep. 30, 2020				$ 1,490				533,694	(523,725)					11,459
Balance (in shares) at Sep. 30, 2020				149,012,652
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 (Note 15)								429						429
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 (Note 15)				$ 31				984						1,015
Warrants exercised (Note 15) (in shares)				3,100,000
Net loss									(3,178)					(3,178)
Balance at Mar. 31, 2021				$ 1,625				539,357	(529,044)					11,938
Balance (in shares) at Mar. 31, 2021				162,469,612
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 Issued During period Shares New Issues										900,000
Net loss														(3,577)
Balance at Sep. 30, 2021				$ 1,628				540,416	(529,443)					12,601
Balance (in shares) at Sep. 30, 2021				162,804,612
Balance at Mar. 31, 2021				$ 1,625				539,357	(529,044)					11,938
Balance (in shares) at Mar. 31, 2021				162,469,612
Increase (Decrease) in Stockholders' Equity
Stock compensation accrued and restricted stock awards granted (Note 15)				$ 3				984						987
Stock compensation accrued and restricted stock awards granted (Note 16)(in shares)				335,000
Net loss									(810)					(810)
Balance at Jun. 30, 2021				$ 1,628				540,341	(529,854)					12,115
Balance (in shares) at Jun. 30, 2021				162,804,612
Increase (Decrease) in Stockholders' Equity
Stock compensation accrued (Note 15)								75						75
Net loss									411					411
Balance at Sep. 30, 2021				$ 1,628				$ 540,416	$ (529,443)					$ 12,601
Balance (in shares) at Sep. 30, 2021				162,804,612