Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Accumulated Deficit)
Beginning balance (in shares) at Dec. 31, 2018		62,163,000	3,770,000
Beginning balance at Dec. 31, 2018	$ 202,013	$ 6	$ (33,237)	$ 343,536	$ (1,116)	$ (107,176)
Increase (Decrease) in Equity [Roll Forward]
Net (loss) income	30,862					30,862
Foreign currency translation adjustment	94				94
Restricted stock granted (in shares)		36,000
Restricted stock forfeited (in shares)			34,000
Treasury stock purchased (in shares)			41,000
Treasury stock purchased	(131)		$ (131)
Stock compensation expense	468			468
Ending balance (in shares) at Mar. 31, 2019		62,199,000	3,845,000
Ending balance at Mar. 31, 2019	233,306	$ 6	$ (33,368)	344,004	(1,022)	(76,314)
Beginning balance (in shares) at Dec. 31, 2018		62,163,000	3,770,000
Beginning balance at Dec. 31, 2018	202,013	$ 6	$ (33,237)	343,536	(1,116)	(107,176)
Increase (Decrease) in Equity [Roll Forward]
Net (loss) income	(33,915)
Ending balance (in shares) at Dec. 31, 2019		63,657,000	4,145,000
Ending balance at Dec. 31, 2019	172,029	$ 6	$ (33,484)	347,564	(966)	(141,091)
Increase (Decrease) in Equity [Roll Forward]
Net (loss) income	(63,967)					(63,967)
Foreign currency translation adjustment	(123)				(123)
Stock issued under employee stock purchase plan (in shares)			(13,000)
Stock issued under employee stock purchase plan	$ 11			11
Restricted stock granted (in shares)	681,190	681,000
Restricted stock granted	$ 338			338
Restricted stock forfeited (in shares)			241,000
Treasury stock purchased (in shares)			22,000
Treasury stock purchased	(45)		$ (45)
Stock compensation expense	462			462
Ending balance (in shares) at Mar. 31, 2020		64,338,000	4,395,000
Ending balance at Mar. 31, 2020	$ 108,705	$ 6	$ (33,529)	$ 348,375	$ (1,089)	$ (205,058)