T-Cell Factory Acquisition - Summary of Amortizable Intangible Assets Acquired With Respective Amortization Periods (Details) - Jun. 30, 2015 - T-Cell Factory Acquisition - USD ($) $ in Thousands	Total
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Finite-lived Intangible Assets Acquired	$ 15,400
Non-compete agreements
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Finite-lived Intangible Assets Acquired	$ 12,400
Acquired Intangible assets amortization period	3 years
Licensing agreements
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Finite-lived Intangible Assets Acquired	$ 3,000
Acquired Intangible assets amortization period	10 years