Goodwill and Other Intangible Assets - Schedule of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 11,599	$ 11,591
Accumulated Amortization	(6,349)	(6,010)
Intangible Assets, Net	5,250	5,581
Proprietary adjuvant technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,991	7,985
Accumulated Amortization	(2,764)	(2,562)
Intangible Assets, Net	5,227	5,423
Collaboration agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,608	3,606
Accumulated Amortization	(3,585)	(3,448)
Intangible Assets, Net	$ 23	$ 158