U.S. Government Contracts and Grants - Additional Information (Detail) - USD ($)		1 Months Ended		12 Months Ended
	Jan. 01, 2021	Jun. 30, 2020	Jul. 31, 2016	Dec. 31, 2021	Dec. 31, 2020
Revenues				$ 4,410,356	$ 8,185,027
BARDA Contract [Member]
Duration of contract	3 years		5 years
Amount used to fund clinical development			$ 136,800,000
BARDA Contract [Member] | Minimum [Member]
Additional funding for development and manufacturing activities	$ 1,100,000
BARDA Contract [Member] | Maximum [Member]
Additional funding for development and manufacturing activities	$ 34,400,000
MTEC Collaborative Arrangement [Member]
Revenues		$ 4,700,000
Grant [Member] | BARDA Contract [Member]
Revenues				3,700,000	3,100,000
Grant [Member] | MTEC Collaborative Arrangement [Member]
Revenues				$ 500,000	$ 4,200,000
Investment Performance [Member] | BARDA Contract [Member]
Revenues			$ 30,900,000