U.S. Government Agreements, Grants and Licenses - Bill & Melinda Gates Foundation and others (Details) $ in Thousands, product in Millions		1 Months Ended			3 Months Ended		9 Months Ended		61 Months Ended
	Sep. 15, 2015	Oct. 31, 2020 product	Jul. 31, 2020 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue					$ 157,024	$ 2,507	$ 195,939	$ 9,846
GAGA
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
UK SARS-CoV-2 Vaccine Supply Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of doses of the vaccine | product		60
UK SARS-CoV-2 Vaccine Supply Agreement | Maximum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of doses of the vaccine | product		60
Grant and other
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue					114,086	$ 2,507	152,690	$ 9,846
Grant and other | BMGF Grant Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Grant awarded			$ 15,000	$ 89,100
Revenue							$ 400		$ 82,000
Grant and other | BMGF Grant Agreement | Maximum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue					100
Grant and other | Bmgf Sa Grant Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue					$ 2,400