Nature of Business (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2022 teenager	Dec. 31, 2021 USD ($) orphan_drug_designation segment dose	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Subsequent Events
Number of operating segments | segment		1
Number of vaccination dose regimen | dose		2
Vaccination dose regimen, duration apart		28 days
Number of vaccination doses administered globally | dose		295,000,000
Number of ODDs received (orphan drug designation) | orphan_drug_designation		4
Net loss		$ (58,365)	$ (21,822)	$ (20,243)
Loss before income taxes		(58,417)	(21,822)	(20,243)
Accumulated deficit		131,667	73,302
Cash, cash equivalents and restricted cash		$ 95,109	$ 24,190	$ 7,595	$ 1,779
Subsequent events
Subsequent Events
Number of teenagers vaccinated | teenager	36,000,000