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Leases (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) ft² | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) ft² | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | May 31, 2023 ft² | Jan. 31, 2023 ft² | Feb. 28, 2019 ft²
Leases |  |  |  |  |  |  |  |
Area leased, sublease agreement | ft² | 33,019 |  | 33,019 |  |  | 11,564 | 6,261 | 20,433
Amortization expense | $ 100 | $ 200 | $ 400 | $ 700 |  |  |  |
Operating Leases: |  |  |  |  |  |  |  |
Current portion of lease liabilities | 465 |  | 465 |  | $ 426 |  |  |
Other liabilities | $ 2,245 |  | $ 2,245 |  | $ 3,074 |  |  |
Financial position | Other liabilities |  | Other liabilities |  | Other liabilities |  |  |
Total operating lease liabilities | $ 2,710 |  | $ 2,710 |  | $ 3,500 |  |  |
Operating Leases |  |  |  |  |  |  |  |
Operating Leases: |  |  |  |  |  |  |  |
Gross cost | 4,530 |  | 4,530 |  | 5,094 |  |  |
Accumulated amortization | (1,556) |  | (1,556) |  | (1,235) |  |  |
Other assets | $ 2,974 |  | $ 2,974 |  | $ 3,859 |  |  |

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