Leases - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) ft²	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) ft²	Jun. 30, 2021 USD ($)
Lessee Lease Description [Line Items]
Lease incentive related to reimbursable leasehold improvements	$ 14.9		$ 14.9
Leasehold improvement costs capitalized			28.9
Leasehold improvement costs reimbursed			6.2
Letter Of Credit Member
Lessee Lease Description [Line Items]
Pledged letter of credit	$ 3.4		$ 3.4
Pod4 [Member]
Lessee Lease Description [Line Items]
Area of Land | ft²	33,518		33,518
Pod 3 [Member]
Lessee Lease Description [Line Items]
Area of Land | ft²	17,150		17,150
Pod5 [Member]
Lessee Lease Description [Line Items]
Area of Land | ft²	54,666		54,666
CambridgeMassachusetts [Member]
Lessee Lease Description [Line Items]
Lessee, operating lease, option to extend			The lease will expire in January 2024 and includes an optional extension for an additional three year period.
Andover, Massachusetts [Member]
Lessee Lease Description [Line Items]
Lessee, operating lease, option to extend			The Company has two options to extend the term of the lease for a period of ten years each
Lab Space [Member]
Lessee Lease Description [Line Items]
OperatingLeaseRentalExpense	$ 1.5	$ 1.4	$ 3.1	$ 2.8
Short Term Lease Expense [Member]
Lessee Lease Description [Line Items]
OperatingLeaseRentalExpense	$ 0.7	$ 0.5	$ 1.6	$ 0.8