Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Revenue Accounted for 10% or More of Total Revenues

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

	Year Ended December 31,
	2013		2012		2011
Bristol-Myers Squibb Company and Pfizer Inc.		38%	–		–
Bayer Pharma, AG and Janssen Pharmaceuticals, Inc.		37%	–		–
Daiichi Sankyo, Inc		23%	–		–
Novartis, AG	–			97%		12%
Biogen Idec	–		–			48%
Merck & Co., Inc.	–		–			40%