Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 2,125	$ (1,219)
Other Comprehensive income (loss), net of tax
Unrealized income (loss) on foreign currency contracts	(58)	(31)
Comprehensive income (loss)	$ 2,067	$ (1,250)