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	$ (19,566)	$ (16,340)	$ (19,920)
Other comprehensive loss
Foreign currency translation	0	71	(71)
Comprehensive loss	$ (19,566)	$ (16,269)	$ (19,991)