Concentration of Credit Risk (Tables)

3 Months Ended

Mar. 31, 2013

Concentration of Credit Risk

Schedule of concentration of credit risk related to collaborative partners

	Percentage of Total Contract Revenues for the Quarters Ended, March 31,
	2013		2012
Collaboration Partner A	60	%	60	%
Collaboration Partner B	40	%	40	%

Schedule of concentration of credit risk related to specialty pharmaceutical customers

	Percentage of Total Net Product Revenues for the Quarters Ended, March 31,
	2013		2012
Customer A	27	%	33	%
Customer B	18	%	26	%
Customer C	12	%	16	%
Customer D	12	%	12	%