Consolidated Statements of Stockholders’ Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock
Beginning balance (shares) at Dec. 31, 2017		37,985,225
Beginning balance at Dec. 31, 2017	$ 235,482	$ 380	$ 326,616	$ (89,645)	$ (1,869)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	644		644
Net loss	(4,146)			(4,146)
RSUs vested, net of shares withheld for taxes (shares)		350,528
RSUs vested, net of shares withheld for taxes	(95)	$ 3	(98)
Purchase of treasury stock (shares)		(82,988)
Purchase of treasury stock	(350)				(350)
Ending balance (shares) at Mar. 31, 2018		38,252,765
Ending balance at Mar. 31, 2018	231,535	$ 383	327,162	(93,791)	(2,219)
Beginning balance (shares) at Dec. 31, 2017		37,985,225
Beginning balance at Dec. 31, 2017	235,482	$ 380	326,616	(89,645)	(1,869)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(11,396)
Ending balance (shares) at Sep. 30, 2018		38,252,765
Ending balance at Sep. 30, 2018	225,721	$ 383	328,598	(101,041)	(2,219)
Beginning balance (shares) at Mar. 31, 2018		38,252,765
Beginning balance at Mar. 31, 2018	231,535	$ 383	327,162	(93,791)	(2,219)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	718		718
Net loss	(3,313)			(3,313)
Ending balance (shares) at Jun. 30, 2018		38,252,765
Ending balance at Jun. 30, 2018	228,940	$ 383	327,880	(97,104)	(2,219)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	718		718
Net loss	(3,937)			(3,937)
Ending balance (shares) at Sep. 30, 2018		38,252,765
Ending balance at Sep. 30, 2018	225,721	$ 383	328,598	(101,041)	(2,219)
Beginning balance (shares) at Dec. 31, 2018		77,078,252
Beginning balance at Dec. 31, 2018	391,533	$ 771	503,446	(109,638)	(3,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issuance costs	(177)
Stock-based compensation	387		387
Net loss	$ (2,373)			(2,373)
Ending balance (shares) at Mar. 31, 2019	77,078,252
Ending balance at Mar. 31, 2019	$ 389,370	$ 771	503,656	(112,011)	(3,046)
Beginning balance (shares) at Dec. 31, 2018		77,078,252
Beginning balance at Dec. 31, 2018	391,533	$ 771	503,446	(109,638)	(3,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(25,778)
Ending balance (shares) at Sep. 30, 2019		76,661,782
Ending balance at Sep. 30, 2019	$ 366,635	$ 767	504,656	(135,416)	(3,372)
Beginning balance (shares) at Mar. 31, 2019	77,078,252
Beginning balance at Mar. 31, 2019	$ 389,370	$ 771	503,656	(112,011)	(3,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	416		416
Net loss	(12,858)			(12,858)
Restricted stock forfeiture (in shares)		(129,573)
Restricted stock forfeiture	0	$ (2)	2
Ending balance (shares) at Jun. 30, 2019		76,948,679
Ending balance at Jun. 30, 2019	376,928	$ 769	504,074	(124,869)	(3,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	582		582
Net loss	(10,547)			(10,547)
Purchase of treasury stock (shares)		(286,897)
Purchase of treasury stock	(328)	$ (2)			(326)
Ending balance (shares) at Sep. 30, 2019		76,661,782
Ending balance at Sep. 30, 2019	$ 366,635	$ 767	$ 504,656	$ (135,416)	$ (3,372)