Leases - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
	Apr. 30, 2023	Jun. 30, 2023	Jun. 30, 2022
Lessee, Lease, Description [Line Items]
Total undiscounted lease payments		$ 27,590
Right-of-use assets obtained in exchange for new operating lease liabilities		3,265	$ 28,573
21 Erie Street, Cambridge, Massachusetts Lease
Lessee, Lease, Description [Line Items]
Operating lease, term of contract (in years)	23 months
Total undiscounted lease payments	$ 3,700
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 3,300
60 First Street, Cambridge, Massachusetts Lease
Lessee, Lease, Description [Line Items]
Expected liability to be paid		$ 208,700
Term of contract, lease not yet commenced (in years)		10 years