Subsequent Events (Details) - Subsequent Events $ in Millions	1 Months Ended	8 Months Ended
	Apr. 30, 2021 USD ($)	Dec. 31, 2021 dose
Subsequent events
Efficacy percentage	77.00%
OWS
Subsequent events
Funding | $	$ 1,750
Gavi Advance Purchase Agreement - COVAX Facility | Forecast
Subsequent events
Number doses		350,000,000
Gavi Advance Purchase Agreement- SIIPL | Forecast
Subsequent events
Number doses		1,100,000,000