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Fair value of financial assets and liabilities - Schedule of Warrant Liability Determined Using Key Inputs for the Black-Scholes Option Pricing Model (Details)
Jun. 30, 2026
$ / shares
yr
USD ($)
Dec. 31, 2025
yr
$ / shares
USD ($)
Exercise price    
Class of Warrant or Right [Line Items]    
Warrant liability measurement input 3.35 3.35
Stock price    
Class of Warrant or Right [Line Items]    
Warrant liability measurement input 1.73 2.90
Expected volatility    
Class of Warrant or Right [Line Items]    
Warrant liability measurement input 0.415 0.401
Expected term (in years)    
Class of Warrant or Right [Line Items]    
Warrant liability measurement input | yr 5.0 5.0
Risk-free interest rate    
Class of Warrant or Right [Line Items]    
Warrant liability measurement input 0.042 0.037
Expected dividend yield    
Class of Warrant or Right [Line Items]    
Warrant liability measurement input | $ 0 0