Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (57,246)	$ (45,722)	$ (47,889)
Other comprehensive income (loss)
Foreign currency translation adjustments	(24)	(613)	167
Comprehensive loss	$ (57,270)	$ (46,335)	$ (47,722)