Stock-Based Compensation (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock-based compensation
Stock-based compensation expense	$ 1,468	$ 4,732	$ 5,223	$ 26,013
Stock options
Stock-based compensation
Total unrecognized compensation cost related to unvested stock-based compensation	1,700		1,700
RSUs
Stock-based compensation
Total unrecognized compensation cost related to unvested stock-based compensation	2,100		2,100
Unvested RSAs
Stock-based compensation
Total unrecognized compensation cost related to unvested stock-based compensation	9,100		9,100
Continuing operations
Stock-based compensation
Stock-based compensation expense	1,468	4,732	5,223	14,384
Discontinued Operations
Stock-based compensation
Stock-based compensation expense	0	0	0	11,629
Research and development | Continuing operations
Stock-based compensation
Stock-based compensation expense	220	1,357	687	2,589
General and administrative | Continuing operations
Stock-based compensation
Stock-based compensation expense	$ 1,248	$ 3,375	$ 4,536	$ 11,795