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Commitments and Contingencies - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2023 | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) ft² | Sep. 30, 2024 USD ($) | Dec. 31, 2023 ft²
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lease cost | $ |  | $ 584 | $ 662 | $ 1,700 | $ 2,000 |
Minimum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating lease, remaining lease term (in years) |  | 1 year 8 months 12 days |  | 1 year 8 months 12 days |  |
Maximum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating lease, remaining lease term (in years) |  | 4 years 3 months 18 days |  | 4 years 3 months 18 days |  |
San Diego, California |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Area leased (in square feet) |  |  |  | 56,600 |  |
Plymouth Meeting, Pennsylvania |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Area leased (in square feet) |  |  |  | 57,400 |  | 11,400
San Diego, California | Minimum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lessee, operating lease, base rate percentage (in percent) | 2.00% |  |  |  |  |
San Diego, California | Maximum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lessee, operating lease, base rate percentage (in percent) | 3.00% |  |  |  |  |

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