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Leases - Narrative (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 17, 2024 USD ($) ft² component | Jun. 01, 2022 USD ($) ft² period building | May 31, 2022 | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 16, 2024 ft² component | Dec. 31, 2023 USD ($)
Leases |  |  |  |  |  |  |  |  |
Operating lease, expense |  |  |  | $ 6,800 | $ 7,200 | $ 13,600 | $ 14,300 |  |
Finance lease liabilities- current |  |  |  | 2,292 |  | 2,292 |  |  | $ 3,000
Finance lease liabilities- noncurrent |  |  |  | 15,574 |  | 15,574 |  |  | 17,184
Aggregate rent, Initial term |  |  |  | 190,428 |  | 190,428 |  |  |
Operating lease ROU assets |  |  |  | 57,135 |  | 57,135 |  |  | 91,896
Operating Lease, Liability |  |  |  | 92,832 |  | 92,832 |  |  |
Gain on termination of lease components |  |  |  | 2,200 |  | 2,179 |  |  |
MassBio |  |  |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |  |  |
Finance lease cost |  |  |  | 300 | $ 400 | 700 | $ 700 |  |
Finance lease liabilities- current |  |  |  | 2,300 |  | 2,300 |  |  | 3,000
Finance lease liabilities- noncurrent |  |  |  | $ 15,600 |  | $ 15,600 |  |  | $ 17,200
Minimum |  |  |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |  |  |
Operating lease, term of contract |  |  |  | 2 months 12 days |  | 2 months 12 days |  |  |
Maximum |  |  |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |  |  |
Operating lease, term of contract |  |  |  | 14 years 10 months 24 days |  | 14 years 10 months 24 days |  |  |
Renewal term |  |  |  | 15 years |  | 15 years |  |  |
Hopewell Campus |  |  |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |  |  |
Area of real estate property | ft² | 93,461 |  |  |  |  |  |  | 220,500 |
Operating lease ROU assets | $ 1,600 |  |  |  |  |  |  |  |
Operating Lease, Liability | $ 1,600 |  |  |  |  |  |  |  |
Number of separate lease components | component |  |  |  |  |  |  |  | 4 |
Number of separate lease components terminated | component | 3 |  |  |  |  |  |  |  |
Gain on termination of lease components |  |  |  | $ 2,200 |  | $ 2,200 |  |  |
Incremental borrowing rate of interest used to remeasure the remaining components of operating lease | 7.50% |  |  |  |  |  |  |  |
Return of letter of credit pertaining to amendments to operating lease agreement | $ 2,500 |  |  |  |  |  |  |  |
Warren Premises |  |  |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |  |  |
Operating lease, term of contract |  | 17 years |  |  |  |  |  |  |
Number of buildings leased | building |  | 2 |  |  |  |  |  |  |
Area of real estate property | ft² |  | 360,000 |  |  |  |  |  |  |
Renewal term |  | 5 years |  |  |  |  |  |  |
Number of renewable terms | period |  | 3 |  |  |  |  |  |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] |  |  | true |  |  |  |  |  |
Aggregate rent, Initial term |  | $ 163,000 |  |  |  |  |  |  |
Operating lease ROU assets |  | 28,900 |  |  |  |  |  |  |
Operating Lease, Liability |  | $ 28,900 |  |  |  |  |  |  |
Base rent abatement period |  | 3 years |  |  |  |  |  |  |
Base rent abatement |  | $ 18,600 |  |  |  |  |  |  |
Aggregate rent net of base rate abatement, initial term |  | 144,400 |  |  |  |  |  |  |
Allowance for lease improvements |  | 36,200 |  |  |  |  |  |  |
Payment due from lessor at issuance of temporary certificate of occupancy |  | $ 5,000 |  |  |  |  |  |  |

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