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Commitments and Contingencies - Additional information (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 31, 2025 USD ($) ft² | Feb. 28, 2025 USD ($) ft² | Jun. 30, 2023 USD ($) ft² | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($)
Commitments and Contingencies |  |  |  |  |  |  |
Operating lease expense |  |  |  | $ 1.2 | $ 0.6 | $ 3.0 | $ 1.9
Short-term lease costs |  |  |  | $ 0.4 | $ 0.2 | $ 1.0 | 0.5
Weighted average remaining lease term |  |  |  | 3 years 1 month 6 days |  | 3 years 1 month 6 days |
Weighted average discount rate |  |  |  | 7.70% |  | 7.70% |
Cash paid |  |  |  |  |  | $ 2.1 | $ 1.3
Shanghai ShouTi | Office Space Lease |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |
Area of space leased (in square feet) | ft² |  |  | 22,500 |  |  |  |
Annual base rent |  |  | $ 0.7 |  |  |  |
Shanghai ShouTi | Lab Lease |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |
Area of space leased (in square feet) | ft² |  |  | 8,400 |  |  |  |
Annual base rent |  |  | $ 0.3 |  |  |  |
Shanghai ShouTi | Office and laboratory space lease |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |
Area of space leased (in square feet) | ft² | 5,000 |  |  |  |  |  |
Annual base rent | $ 0.3 |  |  |  |  |  |
Structure USA | Office Space Lease |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |
Area of subleased space (in square feet) | ft² |  |  | 11,800 |  |  |  |
Sub lease annual base rent |  |  | $ 0.5 |  |  |  |
Sub lease, percentage of increase to annual base rent |  |  | 3.00% |  |  |  |
Area of space leased (in square feet) | ft² |  | 22,365 |  |  |  |  |
Annual base rent |  | $ 1.0 |  |  |  |  |
Percentage of increase to annual base rent |  | 3.00% |  |  |  |  |

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