Goodwill and Other Intangible Assets - Schedule of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 10,817	$ 11,591
Accumulated Amortization	(5,765)	(6,010)
Intangible Assets, Net	5,052	5,581
Proprietary adjuvant technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,452	7,985
Accumulated Amortization	(2,484)	(2,562)
Intangible Assets, Net	4,968	5,423
Collaboration agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,365	3,606
Accumulated Amortization	(3,281)	(3,448)
Intangible Assets, Net	$ 84	$ 158