Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Condensed Consolidated Statements of Comprehensive Income (Loss)
Net loss	$ (2,739)	$ (6,100)	$ (3,545)	$ (12,451)
Other comprehensive Loss:
Unrealized loss, net, on available-for-sale marketable securities, net of tax expense of $0 for both the three and six months ended June 30, 2017 and $1,257 and $0 for the three and six months ended June 30, 2016, respectively	(4)	(3,589)	(97)	(1,198)
Reclassification adjustment for net gain on sale of equity securities included in net loss		(345)	(1,127)	(787)
Comprehensive loss	$ (2,743)	$ (10,034)	$ (4,769)	$ (14,436)