Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 3,916	$ (259)	$ 10,079	$ (250)
Other comprehensive income (loss), net of tax
Unrealized income (loss) on foreign currency contracts	5	(46)	113	(99)
Comprehensive income (loss)	$ 3,921	$ (305)	$ 10,192	$ (349)