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Leases - Narrative (Details) ft² in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) ft² option | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Sep. 25, 2023 USD ($)
Lessee Lease Description [Line Items] |  |  |  |  |
Short-term lease cost | $ | $ 0.4 | $ 0.0 | $ 0.7 |  |
Corporate Headquarters In Pasadena | California |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Office space leases (in sq ft) | ft² |  | 49 |  |  |
Corporate Headquarters In Pasadena | California | Colorado Owner, LLC |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Number of options to renew | option |  | 1 |  |  |
Operating lease renewal term |  | 5 years |  |  |
Research Facility in San Diego | California |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Office space leases (in sq ft) | ft² |  | 144 |  |  |
Operating lease renewal term |  | 10 years |  |  |
Lease term |  | 15 years |  |  |
Maximum additional tenant improvement allowance | $ |  | $ 7.2 |  |  | $ 23.6
Additional tenant improvement allowance interest per annum |  | 7.00% |  |  | 9.00%
Additional tenant improvement allowance liability | $ |  |  |  | $ 30.8 |
Research Facility in San Diego | California | Maximum |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Number of options to renew | option |  | 1 |  |  |
Research Facility in Madison | Wisconsin |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Office space leases (in sq ft) | ft² |  | 115 |  |  |
Number of options to renew | option |  | 2 |  |  |
Operating lease renewal term |  | 5 years |  |  |

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