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Fair Value Measurements - Warrant liabilities (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Warrant liabilities    
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fair Value Adjustment of Warrants Fair Value Adjustment of Warrants
Level 3    
Warrant liabilities    
Fair Value - beginning of period $ 22,024,165 $ 5,652,553
Addition 0 0
Change in fair value (5,783,073) 16,371,612
Fair Value - end of period $ 16,241,092 $ 22,024,165