Summary Of Significant Accounting Policies (Estimated Useful Lives Of Property And Equipment) (Details)	12 Months Ended
	Dec. 31, 2011
Office Equipment And Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment useful life, maximum, years	3
Software And Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment useful life, minimum, years	3
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment useful life, maximum, years	5
Leasehold Improvements And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment useful life	Lesser of estimated useful life or life of lease