Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (5,821)	$ (3,817)
Other comprehensive loss:
Effect of currency translation	(3)	(1)
Comprehensive net loss	$ (5,824)	$ (3,818)