CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (2,629)	$ (3,621)	$ (8,658)	$ (6,825)
Other comprehensive income (loss):
Foreign currency translation adjustment, net of taxes	66	62	(300)	1
Total comprehensive loss	$ (2,563)	$ (3,559)	$ (8,958)	$ (6,824)