CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Capital	Treasury Stock	Deficit
Balance (in shares) at Dec. 31, 2017		112,703,926		3,356,409
Balance, beginning of period at Dec. 31, 2017	$ 73,797	$ 113	$ 164,649	$ (44,384)	$ (46,581)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	4,931		4,931
Exercise of stock options (in shares)				(786,708)
Exercise of stock options	3,554		(8,211)	$ 11,765
Issuance of restricted stock (in shares)				(1,805,475)
Issuance of restricted stock			(23,915)	$ 23,915
Restricted stock cancellation/forfeited			1,672	$ (1,672)
Restricted stock shares cancellation/forfeited (in shares)				132,404
Stock repurchase (in shares)				507,600
Stock repurchase	(7,572)			$ (7,572)
Shares repurchased for tax withholding on vesting of restricted stock (in shares)				464,801
Shares repurchased for tax withholding on vesting of restricted stock	(4,073)			$ (4,073)
Net (loss) income	4,619				4,619
Balance (in shares) at Mar. 31, 2018		112,703,926		1,869,031
Balance, end of period at Mar. 31, 2018	75,256	$ 113	139,126	$ (22,021)	(41,962)
Balance (in shares) at Dec. 31, 2018		112,703,926		3,605,263
Balance, beginning of period at Dec. 31, 2018	49,655	$ 113	164,744	$ (38,642)	(76,560)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	3,014		3,014
Issuance of restricted stock (in shares)				(251,305)
Issuance of restricted stock			(3,025)	$ 3,025
Restricted stock cancellation/forfeited			1,563	$ (1,563)
Restricted stock shares cancellation/forfeited (in shares)				141,381
Shares repurchased for tax withholding on vesting of restricted stock (in shares)				336,674
Shares repurchased for tax withholding on vesting of restricted stock	(1,044)			$ (1,044)
Net (loss) income	(13,273)				(13,273)
Balance (in shares) at Mar. 31, 2019		112,703,926		3,832,013
Balance, end of period at Mar. 31, 2019	$ 38,352	$ 113	$ 166,296	$ (38,224)	$ (89,833)