CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (1,479)	$ (15,306)	$ 13,979
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(49)	11	(109)
Other comprehensive (loss) income	(49)	11	(109)
Comprehensive (loss) income	$ (1,528)	$ (15,295)	$ 13,870