Acquisitions, Investments, and Licenses - Schedule of Pro Forma (Details) - EirGen Pharma Ltd - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition [Line Items]
Revenues	$ 43,848	$ 25,659	$ 76,769	$ 50,185
Net loss	(43,420)	(28,356)	(162,331)	(75,879)
Net loss attributable to common shareholders	$ (42,945)	$ (27,759)	$ (160,931)	$ (74,742)
Basic and diluted net loss per share (USD per share)	$ (0.09)	$ (0.07)	$ (0.35)	$ (0.18)