Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (7,373)	$ (9,111)	$ (11,267)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(2)	(3)	3
Comprehensive loss	$ (7,375)	$ (9,114)	$ (11,264)