Commitments and Contingencies - Heroin Vaccine (Details) - USD ($)	1 Months Ended	5 Months Ended	12 Months Ended
	Oct. 31, 2016	Dec. 31, 2017	Dec. 31, 2019
Other Commitments [Line Items]
Payments for royalties			$ 1,250,000
License Royalty Commitment
Other Commitments [Line Items]
Percentage of royalty net sales	3.00%
Percentage of royalty sublicensed	4.00%
Payments for minimum annual royalty	$ 10,000
Payments for royalties		$ 60,000
Payments for royalties, execution fee		50,000
Royalty expense, monthly rate		833
License Royalty Commitment | Maximum
Other Commitments [Line Items]
Fixed milestone payments	$ 715,700
License Royalty Commitment | Minimum
Other Commitments [Line Items]
Payments for royalties		$ 10,000