Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Percentage of Revenue from Significant Customers

Customers that accounted for 10% or more of total revenues were as follows:

	Year Ended December 31,
	2014		2013		2012
Bristol-Myers Squibb Company and Pfizer Inc.		16%		38%	–
Bayer Pharma, AG and Janssen Pharmaceuticals, Inc.		37%		37%	–
Daiichi Sankyo, Inc		45%		23%	–
Novartis, AG	–		–			97%