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Lease Agreements - Leased facilities (Details) $ in Thousands | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) facility | Dec. 31, 2023 | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
Leases |  |  |  |  |
Operating lease liabilities |  | $ 17 |  |  | $ 34
Leased facilities, Emeryville, California, current location |  |  |  |  |
Leases |  |  |  |  |
Operating leases, number of leased facilities | facility |  | 1 |  |  |
Period of lease extension | 5 months |  |  |  |
Adjustment to right of use asset for lease modification | $ 100 |  |  |  |
Leased facilities, Emeryville, California, future location | Forecast |  |  |  |  |
Leases |  |  |  |  |
Lease term |  |  | 65 months | 65 months |
Total undiscounted lease payments |  |  |  | $ 500 |

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