U.S. Government Agreements, Grants and Licenses - Bill & Melinda Gates Foundation (Details) $ in Thousands, item in Millions		1 Months Ended			3 Months Ended		6 Months Ended
	Sep. 15, 2015	May 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contracts Revenue					$ 35,538	$ 3,357	$ 38,915	$ 7,339
Bill Melinda Gates Foundation [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contracts Revenue					$ 200		400
Grant Agreement				$ 89,100
Global Access Commitments Agreement GACA [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contract term after first sale	15 years
Contract term	10 years
Contract term additional years	5 years
Coalition for Epidemic Preparedness Innovations
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Initial Funding Development Costs		$ 384,500					$ 388,400
Additional Funding Development Cost			$ 3,900
Takeda Pharmaceutical Company Limited | Maximum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of manufacturing capacity doses | item							250