Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (6,594)	$ (7,861)
Other comprehensive gain (loss), net of taxes:
Change in cumulative translation adjustment	48	(62)
Comprehensive loss	$ (6,546)	$ (7,923)