UNAUDITED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Accumulated Deficit [Member]	Total
Balances, beginning of period at Dec. 31, 2018	$ 456,938	$ (435,684)	$ 21,254
Balances, beginning of period (in shares) at Dec. 31, 2018	100,268,161
Shares issued (RSUs vested, net of shares withheld) (Note 6)	$ (46)		(46)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares)	142,380
Shares issued (exercise of stock options)	$ 66		66
Shares issued (exercise of stock options) (in shares)	127,000
Stock-based compensation (Note 6)	$ 467		467
Net income/(loss)		(5,696)	(5,696)
Balances, end of period at Jun. 30, 2019	$ 457,425	(441,380)	16,045
Balances, end of period (in shares) at Jun. 30, 2019	100,537,541
Balances, beginning of period at Dec. 31, 2018	$ 456,938	(435,684)	$ 21,254
Balances, beginning of period (in shares) at Dec. 31, 2018	100,268,161
Shares issued (exercise of stock options) (in shares)			163,667
Balances, end of period at Dec. 31, 2019	$ 457,716	(445,070)	$ 12,646
Balances, end of period (in shares) at Dec. 31, 2019	100,698,124
Balances, beginning of period at Mar. 31, 2019	$ 457,009	(438,336)	18,673
Balances, beginning of period (in shares) at Mar. 31, 2019	100,537,541
Stock-based compensation (Note 6)	$ 416		416
Net income/(loss)		(3,044)	(3,044)
Balances, end of period at Jun. 30, 2019	$ 457,425	(441,380)	16,045
Balances, end of period (in shares) at Jun. 30, 2019	100,537,541
Balances, beginning of period at Dec. 31, 2019	$ 457,716	(445,070)	12,646
Balances, beginning of period (in shares) at Dec. 31, 2019	100,698,124
Shares issued, net of offering costs (Note 6)	$ 807		807
Shares issued, net of offering costs (Note 6) (in shares)	1,031,819
Shares issued (RSUs vested, net of shares withheld) (Note 6)	$ (97)		(97)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares)	316,313
Shares issued (exercise of stock options)	$ 37		$ 37
Shares issued (exercise of stock options) (in shares)	50,000		50,000
Stock-based compensation (Note 6)	$ 592		$ 592
Net income/(loss)		(1,598)	(1,598)
Balances, end of period at Jun. 30, 2020	$ 459,055	(446,668)	12,387
Balances, end of period (in shares) at Jun. 30, 2020	102,096,256
Balances, beginning of period at Mar. 31, 2020	$ 458,106	(448,570)	9,536
Balances, beginning of period (in shares) at Mar. 31, 2020	100,698,124
Shares issued, net of offering costs (Note 6)	$ 807		807
Shares issued, net of offering costs (Note 6) (in shares)	1,031,819
Shares issued (RSUs vested, net of shares withheld) (Note 6)	$ (97)		(97)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares)	316,313
Shares issued (exercise of stock options)	$ 37		37
Shares issued (exercise of stock options) (in shares)	50,000
Stock-based compensation (Note 6)	$ 202		202
Net income/(loss)		1,902	1,902
Balances, end of period at Jun. 30, 2020	$ 459,055	$ (446,668)	$ 12,387
Balances, end of period (in shares) at Jun. 30, 2020	102,096,256