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Goodwill and Other Intangible Assets (Schedule of Identifiable Intangible Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 12,612 $ 12,857
Accumulated Amortization (2,654) (2,064)
Intangible Assets, Net 9,958 10,793
Collaboration agreements [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 3,923 3,999
Accumulated Amortization (1,279) (994)
Intangible Assets, Net 2,644 3,005
Proprietary adjuvant technology [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 8,689 8,858
Accumulated Amortization (1,375) (1,070)
Intangible Assets, Net $ 7,314 $ 7,788