CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (26,089)	$ (21,123)
Other comprehensive loss:
Foreign currency translation loss	(29)	(5)
Comprehensive loss	$ (26,118)	$ (21,128)