Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Condensed Consolidated Statements of Comprehensive Income (Loss)
Net loss	$ (2,820)	$ (11,843)	$ (15,271)	$ (30,573)
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale marketable securities, net of tax expense (benefit) of $(349) for each of the three and nine months ended September 30, 2016 and $6,206 and $(765) for the three and nine months ended September 30, 2015, respectively	2,037	(10,696)	839	1,347
Reclassification adjustment for net gain on sale of equity securities included in net loss			(787)
Comprehensive loss	$ (783)	$ (22,539)	$ (15,219)	$ (29,226)