CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in 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	9,353		9,353
Exercise of stock options (in shares)		0		(786,708)
Exercise of stock options	3,554	$ 0	(8,211)	$ 11,765
Issuance of restricted stock (in shares)		0		(1,821,475)
Issuance of restricted stock	0	$ 0	(24,107)	$ 24,107
Restricted stock cancellation/forfeited (in shares)				207,369
Restricted stock cancellation/forfeited	0		9,606	$ (9,606)
Share repurchase (in shares)				507,600
Share repurchase	(7,572)			$ (7,572)
Shares repurchased for tax withholding (in shares)				507,060
Shares repurchased for tax withholding	(4,404)			$ (4,404)
Net (loss) income	6,423				6,423
Balance (in shares) at Jun. 30, 2018		112,703,926		1,970,255
Balance, end of period at Jun. 30, 2018	81,151	$ 113	151,290	$ (30,094)	(40,158)
Balance (in shares) at Mar. 31, 2018		112,703,926		1,869,031
Balance, beginning of period at Mar. 31, 2018	75,256	$ 113	139,126	$ (22,021)	(41,962)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	4,422		4,422
Issuance of restricted stock (in shares)		0		(16,000)
Issuance of restricted stock	0	$ 0	(193)	$ 193
Restricted stock cancellation/forfeited (in shares)				74,965
Restricted stock cancellation/forfeited	0		7,935	$ (7,935)
Shares repurchased for tax withholding (in shares)				42,259
Shares repurchased for tax withholding	(331)			$ (331)
Net (loss) income	1,804				1,804
Balance (in shares) at Jun. 30, 2018		112,703,926		1,970,255
Balance, end of period at Jun. 30, 2018	81,151	$ 113	151,290	$ (30,094)	(40,158)
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	6,513		6,513
Exercise of stock options (in shares)		0		(150,000)
Exercise of stock options	108	$ 0	(1,343)	$ 1,451
Issuance of restricted stock (in shares)		0		(2,853,235)
Issuance of restricted stock	0	$ 0	(35,740)	$ 35,740
Restricted stock cancellation/forfeited (in shares)				191,953
Restricted stock cancellation/forfeited	0		2,124	$ (2,124)
Shares repurchased for tax withholding (in shares)				361,053
Shares repurchased for tax withholding	(1,109)			$ (1,109)
Net (loss) income	(30,483)				(30,483)
Balance (in shares) at Jun. 30, 2019		112,703,926		1,155,034
Balance, end of period at Jun. 30, 2019	24,684	$ 113	136,298	$ (4,684)	(107,043)
Balance (in shares) at Mar. 31, 2019		112,703,926		3,832,013
Balance, beginning of period at Mar. 31, 2019	38,352	$ 113	166,296	$ (38,224)	(89,833)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	3,499		3,499
Exercise of stock options (in shares)		0		(150,000)
Exercise of stock options	108	$ 0	(1,343)	$ 1,451
Issuance of restricted stock (in shares)		0		(2,601,930)
Issuance of restricted stock	0	$ 0	(32,715)	$ 32,715
Restricted stock cancellation/forfeited (in shares)				50,572
Restricted stock cancellation/forfeited	0		561	$ (561)
Shares repurchased for tax withholding (in shares)				24,379
Shares repurchased for tax withholding	(65)			$ (65)
Net (loss) income	(17,210)				(17,210)
Balance (in shares) at Jun. 30, 2019		112,703,926		1,155,034
Balance, end of period at Jun. 30, 2019	$ 24,684	$ 113	$ 136,298	$ (4,684)	$ (107,043)