Summary of Significant Accounting Policies Useful Life (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (years)	6 years	6 years
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (years)	3 years	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (years)	10 years	10 years