Leases - Additional Information (Details)			1 Months Ended		12 Months Ended
	Dec. 21, 2023 USD ($)	Jul. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) ft²	May 31, 2022 USD ($) ft²	Dec. 31, 2023 USD ($) ft²	Dec. 31, 2022 USD ($)	Apr. 30, 2021
Lessee Lease Description [Line Items]
Initial base rent					$ 2,000,000	$ 1,100,000
Operating lease right-of-use assets			$ 33,233,000		33,233,000	2,223,000
Restricted cash			1,392,000		1,392,000	1,392,000
Lessee, Operating Lease, Option to Extend				one additional five-year term
Operating lease cost					$ 1,966,000	$ 1,115,000
Watertown Lease
Lessee Lease Description [Line Items]
Operating lease right-of-use assets		$ 4,900,000
Extended lease term		2027-04
Lessee, Operating Lease, Existence of Option to Extend [true false]					true
Waltham Lease
Lessee Lease Description [Line Items]
Operating lease right-of-use assets	$ 600,000
Payments for tenant improvements	8,300,000
Clinical Supply Agreement
Lessee Lease Description [Line Items]
Operating lease cost					$ 0
Clinical Supply Agreement | Watertown Lease
Lessee Lease Description [Line Items]
Operating lease period							5 years
Operating Lease, renewal term							1 year
Office and Laboratory | Waltham Lease
Lessee Lease Description [Line Items]
Initial base rent				$ 2,200,000
Percentage of annual rent increment				3.00%
Area of property | ft²				29,000
Payments for tenant improvements	5,900,000
Office and Laboratory | Waltham Sublease
Lessee Lease Description [Line Items]
Initial base rent			$ 1,800,000
Percentage of annual rent increment			3.00%		3.00%
Area of property | ft²			24,000		24,000
Certificate of Deposits | Watertown Lease
Lessee Lease Description [Line Items]
Restricted cash		$ 300,000
Letter of Credit | Watertown Lease
Lessee Lease Description [Line Items]
Secured debt obligations		$ 300,000
Letter of Credit | Waltham Lease
Lessee Lease Description [Line Items]
Restricted cash	$ 1,100,000
Letter of Credit | Waltham Sublease
Lessee Lease Description [Line Items]
Restricted cash			$ 600,000		$ 600,000