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Subsequent Event
3 Months Ended
Mar. 31, 2015
Subsequent Events [Abstract]  
Subsequent Event
Subsequent Event
    
In May 2015, the Company acquired financial rights to potential future milestones and royalties for more than 15 biologic development programs from Selexis SA for $4.0 million. Each acquired program is fully funded by a development partner. Selexis is a privately held global life science company based in Switzerland that focuses on drug discovery for lead identification and cell line development of scale-up and manufacturing of therapeutic protein drugs.