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)	$ (76)		(76)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares)	266,296
Shares issued (exercise of stock options)	$ 66		66
Shares issued (exercise of stock options) (in shares)	127,000
Stock-based compensation (Note 6)	$ 615		615
Net income/(loss)		(8,194)	(8,194)
Balances, end of period at Sep. 30, 2019	$ 457,543	(443,878)	13,665
Balances, end of period (in shares) at Sep. 30, 2019	100,661,457
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 Jun. 30, 2019	$ 457,425	(441,380)	16,045
Balances, beginning of period (in shares) at Jun. 30, 2019	100,537,541
Shares issued (RSUs vested, net of shares withheld) (Note 6)	$ (30)		(30)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares)	123,916
Stock-based compensation (Note 6)	$ 148		148
Net income/(loss)		(2,498)	(2,498)
Balances, end of period at Sep. 30, 2019	$ 457,543	(443,878)	13,665
Balances, end of period (in shares) at Sep. 30, 2019	100,661,457
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)	$ 1,436		1,436
Shares issued, net of offering costs (Note 6) (in shares)	1,541,134
Shares issued (RSUs vested, net of shares withheld) (Note 6)	$ (124)		(124)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares)	395,446
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)	$ 757		$ 757
Net income/(loss)		2,622	2,622
Balances, end of period at Sep. 30, 2020	$ 459,822	(442,448)	17,374
Balances, end of period (in shares) at Sep. 30, 2020	102,684,704
Balances, beginning of period at Jun. 30, 2020	$ 459,055	(446,668)	12,387
Balances, beginning of period (in shares) at Jun. 30, 2020	102,096,256
Shares issued, net of offering costs (Note 6)	$ 629		629
Shares issued, net of offering costs (Note 6) (in shares)	509,315
Shares issued (RSUs vested, net of shares withheld) (Note 6)	$ (27)		(27)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares)	79,133
Stock-based compensation (Note 6)	$ 165		165
Net income/(loss)		4,220	4,220
Balances, end of period at Sep. 30, 2020	$ 459,822	$ (442,448)	$ 17,374
Balances, end of period (in shares) at Sep. 30, 2020	102,684,704