Goodwill and Other Intangible Assets (Schedule of Identifiable Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 12,113	$ 11,935
Accumulated Amortization	(2,952)	(2,710)
Intangible Assets, Net	9,161	9,225
Collaboration agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,768	3,713
Accumulated Amortization	(1,422)	(1,306)
Intangible Assets, Net	2,346	2,407
Proprietary adjuvant technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,345	8,222
Accumulated Amortization	(1,530)	(1,404)
Intangible Assets, Net	$ 6,815	$ 6,818