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Leases - Narrative (Details) $ in Thousands | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2025 USD ($) | Jun. 30, 2025 USD ($) ft² | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Aug. 31, 2024 ft² | Nov. 30, 2021
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Restricted cash |  | $ 13,691 |  | $ 14,062 |  |
Operating lease right-of-use assets |  | 120,203 |  | 47,156 |  |
Total operating lease liability |  | 119,736 |  |  |  |
Prepaid expenses |  | (3,032) |  | (6,777) |  |
Total payments under dispute |  | 13,900 |  | 10,800 |  |
Reduction in operating lease liabilities |  | 2,053 | $ 5,672 |  |  |
60 First Street, Cambridge, Massachusetts Lease |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract, lease not yet commenced (in years) |  |  |  |  |  | 10 years
Operating lease, extension (in years) |  |  |  |  |  | 10 years
Restricted cash |  | 13,100 |  | $ 13,100 |  |
Operating lease right-of-use assets |  | 76,800 | 44,900 |  |  |
Total operating lease liability |  | $ 78,600 | 33,600 |  |  |
60 First Street, Cambridge, Massachusetts Lease | Revision of Prior Period, Reclassification, Adjustment |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating lease right-of-use assets |  |  | 11,300 |  |  |
Prepaid expenses |  |  | $ 11,300 |  |  |
480 Arsenal Amendment |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Area of operating lease | ft² |  |  |  |  | 16,000 |
500 Arsenal Lease |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract, lease not yet commenced (in years) |  | 11 months |  |  |  |
Restricted cash |  | $ 600 |  |  |  |
Operating lease right-of-use assets | $ 7,000 |  |  |  |  |
Total operating lease liability | 5,500 |  |  |  |  |
Area of operating lease | ft² |  | 48,500 |  |  |  |
Tenant Improvements |  | $ 2,400 |  |  |  |
Reduction in operating lease liabilities | 3,100 |  |  |  |  |
Reduction to operating lease right-of-use assets | $ 3,100 |  |  |  |  |
500 Arsenal Lease, Additional Tenant Improvement Allowance |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Tenant Improvements |  | $ 1,200 |  |  |  |
Expansion Space |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Area of operating lease | ft² |  |  |  |  | 9,400 |

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