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, 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)				(150,000)
Exercise of stock options	108		(1,343)	$ 1,451
Issuance of restricted stock (in shares)				(2,853,235)
Issuance of restricted stock	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	(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)				(150,000)
Exercise of stock options	108		(1,343)	$ 1,451
Issuance of restricted stock (in shares)				(2,601,930)
Issuance of restricted stock	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	(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)
Balance (in shares) at Dec. 31, 2019		112,703,926		1,885,277
Balance, beginning of period at Dec. 31, 2019	34,398	$ 113	147,231	$ (10,806)	(102,140)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	3,781		3,781
Exercise of stock options (in shares)				(220,300)
Exercise of stock options	298		(1,658)	$ 1,956
Restricted stock cancellation/forfeited (in shares)				285,611
Restricted stock cancellation/forfeited	0		2,124	$ (2,124)
Shares repurchased for tax withholding (in shares)				461,934
Shares repurchased for tax withholding	(2,330)		147	$ (2,477)
Net loss	(13,287)				(13,287)
Balance (in shares) at Jun. 30, 2020		112,703,926		2,412,522
Balance, end of period at Jun. 30, 2020	22,860	$ 113	151,625	$ (13,451)	(115,427)
Balance (in shares) at Mar. 31, 2020		112,703,926		2,163,066
Balance, beginning of period at Mar. 31, 2020	30,339	$ 113	149,765	$ (12,578)	(106,961)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	1,866		1,866
Exercise of stock options (in shares)				(50,000)
Exercise of stock options	0		(444)	$ 444
Restricted stock cancellation/forfeited (in shares)				42,613
Restricted stock cancellation/forfeited	0		378	$ (378)
Shares repurchased for tax withholding (in shares)				256,843
Shares repurchased for tax withholding	(879)		60	$ (939)
Net loss	(8,466)				(8,466)
Balance (in shares) at Jun. 30, 2020		112,703,926		2,412,522
Balance, end of period at Jun. 30, 2020	$ 22,860	$ 113	$ 151,625	$ (13,451)	$ (115,427)