Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Consolidated Statements of Comprehensive Income (Loss)
Net loss	$ (2,191)	$ (2,820)	$ (5,736)	$ (15,271)
Other comprehensive Loss:
Unrealized gain (loss), net, on available-for-sale marketable securities, net of tax benefit of $0 for both the three and nine months ended September 30, 2017 and $349 for each of the three and nine months ended September 30, 2016, respectively	(1)	2,037	(98)	839
Reclassification adjustment for net gain on sale of equity securities included in net loss			(1,127)	(787)
Comprehensive loss	$ (2,192)	$ (783)	$ (6,961)	$ (15,219)