CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Common Stock Subscription Agreement	Common Stock Private Placement	Common Stock	Additional Paid-in Capital Subscription Agreement	Additional Paid-in Capital Private Placement	Additional Paid-in Capital	Accumulated Deficit	LPC Program [Member]	Subscription Agreement	Private Placement	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											(5,659)
Balance at Jun. 30, 2020			$ 1,282			525,844	(522,439)				4,687
Balance (in shares) at Jun. 30, 2020			128,176,938
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
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											(3,988)
Balance at Jun. 30, 2021			$ 1,628			540,341	(529,854)				12,115
Balance (in shares) at Jun. 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 16)			$ 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