Related-Party Transactions	3 Months Ended
Related-Party Transactions	Mar. 31, 2015
Related Party Transactions [Abstract]
Related-Party Transactions	10. Related-Party Transactions The Company has collaboration and license agreements with FHCRC and MSK, who are also common stockholders. See Note 2, Collaboration Agreements and Note 3, License Agreements. As of March 31, 2015, the Company had a supply and license agreement with Stage, in which the Company also had an investment in preferred stock. The investment was accounted for as a cost-method investment because the Company did not have the ability to significantly influence or control Stage. In May 2015, the Company acquired the remaining ownership interest in Stage. See Note 11, Subsequent Events.

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

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