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)	$ 51		51
Net loss		(2,652)	(2,652)
Balances, end of period at Mar. 31, 2019	$ 457,009	(438,336)	18,673
Balances, end of period (in shares) at Mar. 31, 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
Stock-based compensation (Note 6)	$ 390		390
Net loss		(3,500)	(3,500)
Balances, end of period at Mar. 31, 2020	$ 458,106	$ (448,570)	$ 9,536
Balances, end of period (in shares) at Mar. 31, 2020	100,698,124