Intangible Assets and Goodwill - Schedule of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 11,961	$ 13,208
Accumulated Amortization	(7,191)	(7,483)
Intangible Assets, Net	4,770	5,725
Proprietary adjuvant technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,239	9,099
Accumulated Amortization	(3,469)	(3,374)
Intangible Assets, Net	4,770	5,725
Collaboration agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,722	4,109
Accumulated Amortization	(3,722)	(4,109)
Intangible Assets, Net	$ 0	$ 0