Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Nov. 30, 2021
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term	5 years	5 years
Arsenal Street Sublease
Lessee, Lease, Description [Line Items]
Sublease income	$ 0.1	$ 0.2
Cambridge, Massachusetts Office Space
Lessee, Lease, Description [Line Items]
Commencement of rent payments (in years)			11 months
Expected liability to be paid	$ 208.7	$ 208.7
Term of contract, lease not yet commenced (in years)	10 years	10 years