Research Funding	6 Months Ended
Research Funding	Jun. 30, 2015
Research and Development [Abstract]
Research Funding	Research Funding California Institute of Regenerative Medicine In June 2015, the California Institute of Regenerative Medicine ("CIRM") granted the Company a $17.7 million award (the "Award") to fund a significant portion of its Phase 3 Intus study for treating patients with recurrent Stage III or Stage IV metastatic melanoma. The Award provides for a $3.0 million project initiation payment, and $14.7 million in future operational milestone payments, and is subject to a dollar-for-dollar match funding by the Company. On June 30, 2015, the Company received the $3.0 million project initiation payment from CIRM, which will be amortized over the estimated Award period as a reduction to the related research and development expenses. Future operational milestone payments will be recorded as a reduction to research and development expenses when the milestone is achieved and payment is received or probable. The State of California has the right to receive, subject to the terms and conditions of the agreement between the Company and CIRM, future payments from the Company, or its collaborators, from sales of a commercial product resulting from research and development efforts supported by the grant, of up to nine times of the Award.

The entire disclosure for research, development, and computer software activities, including contracts and arrangements to be performed for others and with federal government. Includes costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility and in-process research and development acquired in a business combination consummated during the period.