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, 2017		35,838,000
Beginning 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	(889)		(889)
Equity compensation	$ 3,575		3,575
Stock repurchase and retirement (in shares)	(432,000)	(432,439)
Stock repurchase and retirement	$ (5,000)	$ (5,000)
Foreign currency translation adjustment, net of taxes	(121)			(121)
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)		14,000
Vesting of restricted stock and performance stock awards (in shares)		231,000
Vesting of restricted stock	(801)		(801)
Equity compensation	3,396		3,396
Stock repurchase and retirement (in shares)		0
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of share options (in shares)	1,000
Vesting of restricted stock and performance stock awards (in shares)		306,000
Vesting of restricted stock	$ (658)		(658)
Equity compensation	5,403		5,403
Stock repurchase and retirement (in shares)		0
Foreign currency translation adjustment, net of taxes	(40)			(40)
Distribution to noncontrolling shareholder	(1,154)					(1,154)
Net (loss) income	(12,142)				(12,962)	820
Ending Balance (in shares) at Dec. 31, 2020		36,177,000
Ending Balance at Dec. 31, 2020	$ 154,909	$ 4	$ 310,388	$ (1,280)	$ (154,737)	$ 534