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Related parties - Narrative (Details) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) | Nov. 30, 2021 contract
Related Party Transaction |  |  |  |
Number of directors | contract |  |  |  | 1
Contract with customer, liability | $ 140,800 |  |  |
Accrued interest | 24,900 |  |  |
Blackstone Collaboration Agreement |  |  |  |
Related Party Transaction |  |  |  |
Carrying amount of liability | 140,778 | $ 125,900 | $ 47,016 |
Non-cash interest expense, catch-up |  | $ 10,000 |  |
Syncona LLP | Underwriters public offering |  |  |  |
Related Party Transaction |  |  |  |
Exercise price of warrant (in usd per share) | $ / shares |  | $ 2.00 |  |
Investee of Syncona | License revenue |  |  |  |
Related Party Transaction |  |  |  |
Remaining performance obligation, variable consideration amount | $ 350 |  |  |
Autolus | Investee Of Syncona Portfolio Limited | License revenue |  |  |  |
Related Party Transaction |  |  |  |
Ownership percentage by noncontrolling owners (in percent) | 10.00% |  |  |
Blackstone | Autolus |  |  |  |
Related Party Transaction |  |  |  |
Ownership percentage by noncontrolling owners (in percent) |  |  |  | 10.00%

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