Goodwill and Other Intangible Assets - Schedule of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 11,591	$ 12,130
Accumulated Amortization	(6,010)	(5,589)
Intangible Assets, Net	5,581	6,541
Proprietary adjuvant technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,985	8,357
Accumulated Amortization	(2,562)	(2,263)
Intangible Assets, Net	5,423	6,094
Collaboration agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,606	3,773
Accumulated Amortization	(3,448)	(3,326)
Intangible Assets, Net	$ 158	$ 447