CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Noncontrolling Interest in Subsidiary
Beginning Balance (in shares) at Dec. 31, 2016		32,339,000
Beginning Balance at Dec. 31, 2016	$ 151,802	$ 3	$ 256,570	$ (1,241)	$ (104,089)	$ 559
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of share options (in shares)		41,000
Vesting of restricted stock and performance stock awards (in shares)		282,000
Vesting of restricted stock and performance stock awards	(1,774)		(1,774)
Shares issued for Convertible Notes (in shares)		3,176,000
Shares issued for Convertible Notes	45,952	$ 1	45,951
Equity compensation	4,080		4,080
Cumulative-effect adjustment - share-based compensation			535		(535)
Foreign currency translation adjustment, net of taxes	$ 75			75
Stock repurchase and retirement (in shares)	0
Distribution to noncontrolling shareholder	$ (1,218)					(1,218)
Net (loss) income	38,802				37,513	1,289
Ending Balance (in shares) at Dec. 31, 2017		35,838,000
Ending Balance at Dec. 31, 2017	237,719	$ 4	305,362	(1,166)	(67,111)	630
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of share options (in shares)		21,000
Vesting of restricted stock and performance stock awards (in shares)		199,000
Vesting of restricted stock and performance stock awards	(889)		(889)
Equity compensation	3,575		3,575
Foreign currency translation adjustment, net of taxes	$ (121)			(121)
Stock repurchase and retirement (in shares)	0	(432,439)
Stock repurchase and retirement	$ (5,000)	$ (5,000)	(5,000)
Net change in hedging transaction, net of taxes	(175)			(175)
Distribution to noncontrolling shareholder	(1,194)					(1,194)
Net (loss) income	(15,717)				(16,951)	1,234
Ending Balance (in shares) at Dec. 31, 2018		35,626,000
Ending Balance at Dec. 31, 2018	$ 218,198	$ 4	303,048	(1,462)	(84,062)	670
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of share options (in shares)	32,500	14,000
Vesting of restricted stock and performance stock awards (in shares)		231,000
Vesting of restricted stock and performance stock awards	$ (801)		(801)
Equity compensation	3,396		3,396
Foreign currency translation adjustment, net of taxes	47			47
Net change in hedging transaction, net of taxes	175			175
Distribution to noncontrolling shareholder	(1,572)					(1,572)
Net (loss) income	(55,943)				(57,713)	1,770
Ending Balance (in shares) at Dec. 31, 2019		35,871,000
Ending Balance at Dec. 31, 2019	$ 163,500	$ 4	$ 305,643	$ (1,240)	$ (141,775)	$ 868