CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (16,704)	$ (1,517)	$ (17,959)	$ 1,907
Other comprehensive (loss) income, net of applicable tax:
Foreign currency translation adjustments	(283)	75	(485)	(81)
Comprehensive (loss) income	$ (16,987)	$ (1,442)	$ (18,444)	$ 1,826