Stock-Based Compensation (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stock-based compensation
Stock-based compensation expense	$ 1,822	$ 7,747	$ 3,755	$ 21,281
Stock options
Stock-based compensation
Total unrecognized compensation cost related to unvested stock-based compensation	1,900		1,900
RSUs
Stock-based compensation
Total unrecognized compensation cost related to unvested stock-based compensation	2,600		2,600
Unvested RSAs
Stock-based compensation
Total unrecognized compensation cost related to unvested stock-based compensation	8,200		8,200
Continuing operations
Stock-based compensation
Stock-based compensation expense	1,822	3,595	3,755	9,652
Discontinued Operations
Stock-based compensation
Stock-based compensation expense	0	4,152	0	11,629
Research and development | Continuing operations
Stock-based compensation
Stock-based compensation expense	232	514	467	1,232
General and administrative | Continuing operations
Stock-based compensation
Stock-based compensation expense	$ 1,590	$ 3,081	$ 3,288	$ 8,420