Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net loss	$ (13,513)	$ (13,664)	$ (20,117)
Foreign currency translation adjustment	137	(1,573)	(943)
Comprehensive loss	$ (13,376)	$ (15,237)	$ (21,060)