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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pro Forma Result of Combined Companies
Revenues	$ 20,641	$ 13,976	$ 75,838	$ 37,327
Net loss	(75,858)	(15,745)	130,118	(43,864)
Net loss attributable to common shareholders	$ (75,055)	$ (16,302)	$ (128,229)	$ (45,534)
Basic and diluted loss per share (in dollars per share)	$ (0.19)	$ (0.04)	$ (0.32)	$ (0.12)