Acquisitions, Investments, and Licenses - Summary of Pro Forma Results (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pro Forma Result of Combined Companies
Revenues	$ 19,773	$ 20,641	$ 65,592	$ 75,838
Net loss	(50,014)	(75,858)	(121,176)	130,118
Net loss attributable to common shareholders	$ (48,669)	$ (75,055)	$ (118,695)	$ (128,229)
Basic and diluted loss per share (in dollars per share)	$ (0.11)	$ (0.19)	$ (0.28)	$ (0.32)