Summary of Significant Accounting Policies (Details 4)	12 Months Ended
	Dec. 31, 2012
Lab equipment | Minimum
Property and Equipment
Estimated useful life	3 years
Lab equipment | Maximum
Property and Equipment
Estimated useful life	7 years
IT equipment | Minimum
Property and Equipment
Estimated useful life	3 years
IT equipment | Maximum
Property and Equipment
Estimated useful life	7 years
Furniture and fixtures | Minimum
Property and Equipment
Estimated useful life	3 years
Furniture and fixtures | Maximum
Property and Equipment
Estimated useful life	7 years