Sanofi (Details) (Sanofi, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Sanofi
Research and Development Collaboration and License Agreements
Initial upfront non-refundable payment	$ 35
Additional non-refundable payment	5
Development, regulatory and commercial contingent payments	$ 250
Maximum days to participate in development and promotion of products	90 days