Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income (Loss) [Abstract]
Net (loss) income	$ (8,349)	$ (13,805)	$ 4,209	$ (34,962)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	3	11	1	2
Comprehensive income (loss)	$ (8,346)	$ (13,794)	$ 4,210	$ (34,960)