Goodwill and Other Intangible Assets - Schedule of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 13,208	$ 11,591
Accumulated Amortization	(7,483)	(6,010)
Intangible Assets, Net	5,725	5,581
Proprietary adjuvant technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9,099	7,985
Accumulated Amortization	(3,374)	(2,562)
Intangible Assets, Net	5,725	5,423
Collaboration agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,109	3,606
Accumulated Amortization	(4,109)	(3,448)
Intangible Assets, Net	$ 0	$ 158