Agreement with Ono Pharmaceutical Co., Ltd. (Details) (USD $) In Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011
Agreement with Ono Pharmaceutical Co. Ltd (Textuals) [Abstract]
Reimbursement of global development costs	$ 4.4	$ 7.4
Potential Milestone and Global Development Support Payments	$ 289.3	$ 289.3