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Long-term debt (Details) - USD ($) $ in Millions |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 01, 2024 | Mar. 31, 2024 | Mar. 31, 2023 | Jan. 05, 2027 | Dec. 01, 2025 | Dec. 31, 2023
Long-term Debt |  |  |  |  |  |
Investment, Variable Interest Rate, Type [Extensible Enumeration] |  | Prime Rate |  |  |  |
2023 Amended Facility |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Outstanding debt |  | $ 100.0 |  |  |  |
Interest rate (as a percent) |  | 7.95% |  |  |  |
Amortized cost net of discount and debt issuance costs |  | $ 103.3 |  |  |  | $ 102.9
Foreign currency loss |  | 2.3 |  |  |  |
Foreign currency gain |  |  | $ 0.7 |  |  |
Interest expense recorded |  | $ 3.7 | $ 3.6 |  |  |
2023 Amended Facility | Forecast |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Back-end fees |  |  |  | $ 1.3 | $ 4.9 |
2023 Amended Facility | Prime Rate |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Variable interest rate basis |  | 7.95% |  |  |  |
Discount rate (as a percent) |  | 3.25% |  |  |  |
Venture debt loan facility | 2023 Amended Facility |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Minimum cash and cash equivalents in U.S. bank accounts |  | 65.00% | 100.00% |  |  |
Assets pledged to secure facilities by directly or indirectly |  | $ 770.1 |  |  |  |
Assets not being pledged to secure facilities by directly or indirectly |  | 6.8 |  |  |  |
Venture debt loan facility | 2023 Amended Facility | uniQure France |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Assets not being pledged to secure facilities by directly or indirectly |  | $ 87.7 |  |  |  |
Subsequent events. | Venture debt loan facility | 2023 Amended Facility |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |
Minimum cash and cash equivalents in U.S. bank accounts | 30.00% |  |  |  |  |

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