Goodwill and Other Intangible Assets (Schedule of Identifiable Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 12,808	$ 11,935
Accumulated Amortization	(3,333)	(2,710)
Intangible Assets, Net	9,475	9,225
Collaboration agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,984	3,713
Accumulated Amortization	(1,606)	(1,306)
Intangible Assets, Net	2,378	2,407
Proprietary adjuvant technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,824	8,222
Accumulated Amortization	(1,727)	(1,404)
Intangible Assets, Net	$ 7,097	$ 6,818