Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Condensed Consolidated Statements of Comprehensive Loss
Net Loss	$ (9,445)	$ (8,039)	$ (18,863)	$ (14,540)
Other comprehensive income:
Unrealized (losses) gains on available-for-sale securities	(6)		8
Total other comprehensive income (loss):	(6)		8
Comprehensive loss	$ (9,451)	$ (8,039)	$ (18,855)	$ (14,540)