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Fair value accounting (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
May 31, 2026 USD ($) $ / shares Institution | Nov. 30, 2025 USD ($)
Fair value accounting |  |
Number of financial institutions, uninsured cash held | Institution | 2 |
Fair value of the derivative liability | $ 34,534 | $ 30,743
Fair value loss | $ 3,800 |
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain (Loss) on Derivative Instruments, Net, Pretax |
Level 3 |  |
Fair value accounting |  |
Fair value of the derivative liability | $ 34,500 | $ 30,700
Level 3 | Recurring | Common stock price |  |
Fair value accounting |  |
Measurement input | $ / shares | 4.63 |
percentage of change in an unobservable input | 10.00% |
Gain or loss on the derivative liability, change on unobservable input | $ 5,200 |
Level 3 | Recurring | Volatility |  |
Fair value accounting |  |
Measurement input | 0.8207 |
Level 3 | Recurring | Risk-free rate |  |
Fair value accounting |  |
Measurement input | 0.0363 |
Level 3 | Recurring | Project Completion |  |
Fair value accounting |  |
percentage of change in an unobservable input | 10.00% |
Gain or loss on the derivative liability, change on unobservable input | $ 1,400 |

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