CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss, net	(Accumulated Deficit) Retained Earnings	Noncontrolling Interest in Subsidiary
Beginning balance (in shares) at Dec. 31, 2018		35,626
Beginning 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)		9
Vesting of restricted stock (in shares)		225
Vesting of restricted stock	(788)		(788)
Equity compensation	1,535		1,535
Foreign currency translation adjustment, net of taxes	72			72
Net change in hedging transaction, net of taxes	(945)			(945)
Distribution to noncontrolling shareholder	(738)					(738)
Net (loss) income	(52,646)				(53,441)	795
Ending balance (in shares) at Jun. 30, 2019		35,860
Ending balance at Jun. 30, 2019	164,688	$ 4	303,795	(2,335)	(137,503)	727
Beginning balance (in shares) at Mar. 31, 2019		35,806
Beginning balance at Mar. 31, 2019	216,010	$ 4	302,802	(1,661)	(85,829)	694
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of share options (in shares)		5
Vesting of restricted stock (in shares)		49
Vesting of restricted stock	(11)		(11)
Equity compensation	1,004		1,004
Foreign currency translation adjustment, net of taxes	19			19
Net change in hedging transaction, net of taxes	(693)			(693)
Distribution to noncontrolling shareholder	(371)					(371)
Net (loss) income	(51,270)				(51,674)	404
Ending balance (in shares) at Jun. 30, 2019		35,860
Ending balance at Jun. 30, 2019	164,688	$ 4	303,795	(2,335)	(137,503)	727
Beginning balance (in shares) at Dec. 31, 2019		35,871
Beginning balance at Dec. 31, 2019	163,500	$ 4	305,643	(1,240)	(141,775)	868
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock (in shares)		304
Vesting of restricted stock	(657)		(657)
Equity compensation	2,999		2,999
Foreign currency translation adjustment, net of taxes	(87)			(87)
Distribution to noncontrolling shareholder	(865)					(865)
Net (loss) income	(15,816)				(16,240)	424
Ending balance (in shares) at Jun. 30, 2020		36,175
Ending balance at Jun. 30, 2020	149,074	$ 4	307,985	(1,327)	(158,015)	427
Beginning balance (in shares) at Mar. 31, 2020		36,092
Beginning balance at Mar. 31, 2020	161,402	$ 4	305,935	(1,318)	(143,864)	645
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock (in shares)		83
Vesting of restricted stock	(22)		(22)
Equity compensation	2,072		2,072
Foreign currency translation adjustment, net of taxes	(9)			(9)
Distribution to noncontrolling shareholder	(321)					(321)
Net (loss) income	(14,048)				(14,151)	103
Ending balance (in shares) at Jun. 30, 2020		36,175
Ending balance at Jun. 30, 2020	$ 149,074	$ 4	$ 307,985	$ (1,327)	$ (158,015)	$ 427