Condensed Consolidated Statements of Comprehensive Income (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 Income (Loss)
Net loss	$ (6,100)	$ (9,237)	$ (12,451)	$ (18,730)
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale marketable securities, net of tax expense (benefit) of $1,257 and $0 for the three and six months ended June 30, 2016, respectively, and $(1,344) and $(6,970) for the three and six months ended June 30, 2015, respectively	(3,589)	(5,487)	(1,198)	12,043
Reclassification adjustment for net gain on sale of equity securities included in net loss	(345)		(787)
Comprehensive loss	$ (10,034)	$ (14,724)	$ (14,436)	$ (6,687)