The Merger (Narrative) (Details) - USD ($)		3 Months Ended
	May 09, 2019	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Goodwill acquired		$ 3,490,000		$ 3,490,000
AmpliPhi Biosciences Corporation [Member]
Total purchase consideration	$ 10,700,000
Goodwill acquired	3,500,000
Intangible assets acquired	10,300,000
Deferred tax liability acquired	3,100,000
Business combination, acquisition related costs	$ 1,100,000	$ 0	$ 600,000