License And Collaboration Agreements (Details) (Blue Ash Agreement [Member], USD $) In Millions	3 Months Ended
Mar. 31, 2011
Blue Ash Agreement [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Upfront license agreement payment	$ 40

Name:

us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersLineItems

Namespace Prefix:

us-gaap

Data Type:

xbrli:stringItemType

Balance Type:

na

Period Type:

duration