CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock Issued	Additional Paid-in Capital	Treasury Stock	Accumulated 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	3,014		3,014
Issuance of restricted stock (in shares)				(251,305)
Issuance of restricted stock	0		(3,025)	$ 3,025
Restricted stock shares canceled/forfeited	0		1,563	$ (1,563)
Restricted stock shares cancelled/forfeited (in shares)				141,381
Shares repurchased for tax withholding (in shares)				336,674
Shares repurchased for tax withholding	(1,044)			$ (1,044)
Net loss	(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)
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	1,915		1,915
Exercise of stock options (in shares)				(170,300)
Exercise of stock options	298		(1,214)	$ 1,512
Restricted stock shares canceled/forfeited	0		1,746	$ (1,746)
Restricted stock shares cancelled/forfeited (in shares)				242,998
Shares repurchased for tax withholding (in shares)				205,091
Shares repurchased for tax withholding	(1,451)		87	$ (1,538)
Net loss	(4,821)				(4,821)
Balance (in shares) at Mar. 31, 2020		112,703,926		2,163,066
Balance, end of period at Mar. 31, 2020	$ 30,339	$ 113	$ 149,765	$ (12,578)	$ (106,961)