Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
License Fee Obligations, Total	$ 950	[1]
License Fee Obligations, 2015	483	[1]
License Fee Obligations, 2016 and 2017	308	[1]
License Fee Obligations, 2018 and 2019	106	[1]
License Fee Obligations, 2020 and thereafter	53	[1]
Operating lease obligations, Total	11,168	[2]
Operating lease obligations, 2015	1,211	[2]
Operating lease obligations, 2016 and 2017	2,508	[2]
Operating lease obligations, 2018 and 2019	2,670	[2]
Operating lease obligations, 2020 and thereafter	4,779	[2]
Total	12,118
Total, 2015	1,694
Total, 2016 and 2017	2,816
Total, 2018 and 2019	2,776
Total, 2020 and thereafter	$ 4,832

[1] Obligations for license agreement with the University of California, Los Angeles (UCLA) and sponsored research agreement with the Massachusetts Institute of Technology (MIT). The amounts in the table assume the foregoing agreements are continued through their respective terms. The agreements may be terminated at the option of either party. In such event, the Company’s obligation would be limited to costs through the date of such termination.

[2] Operating lease obligations are stated based on the Amended Lease agreement for the office, warehouse and laboratory facilities executed in February 2012.