Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (36,088)	$ (24,606)	$ (16,247)
Other comprehensive loss, net of taxes:
Change in cumulative translation adjustment	(139)	(66)	(43)
Comprehensive loss	$ (36,227)	$ (24,672)	$ (16,290)