Collaboration and License Agreements (Details) In Millions, unless otherwise specified	1 Months Ended			3 Months Ended	12 Months Ended
	Mar. 31, 2015 USD ($)	Oct. 31, 2014 USD ($)	Oct. 31, 2014 EUR (€)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Collaboration and License Agreements [Abstract]
Ipsen Maximum Regulatory And Commercial Milestones		$ 34
Ipsen Maximum Sales Milestones			72
Ipsen Total Upfront Payments	24.5
Ipsen Revenue Allocated to License Deliverable				1.4	21.2
Ipsen Revenue Allocated to Development Deliverable		1.7
Ipsen Revenue Allocated to Committee Deliverable		0.1
Ipsen Revenue Recognized				$ 1.7