Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (4,375)	$ (6,550)	$ (8,284)	$ (13,144)
Other comprehensive gain (loss), net of taxes:
Change in cumulative translation adjustment	53	(18)	143	30
Comprehensive loss	$ (4,322)	$ (6,568)	$ (8,141)	$ (13,114)