Agreements (Details 4) (Biotest, Development and Commercialization License, USD $)	1 Months Ended			1 Months Ended
	Jul. 31, 2006	Jul. 31, 2006 Minimum	Jul. 31, 2006 Maximum	Sep. 30, 2008 Phase I clinical trial	Jul. 31, 2006 Development milestones	Jun. 30, 2012 Development milestones Phase IIb clinical trial	Jul. 31, 2006 Regulatory milestones
Collaborative Agreements disclosures
Payments received under collaboration agreement	$ 1,000,000			$ 500,000
Potential milestone payments receivable			35,500,000		4,500,000	2,000,000	31,000,000
Opt-in-fee payable on exercise of right		$ 5,000,000	$ 15,000,000