v3.25.4
FINANCIAL INSTRUMENTS & RISK - Credit Risk (Details) - CHF (SFr)
SFr in Thousands
Dec. 31, 2025
Dec. 31, 2024
Related party long-term payables    
Financial assets, carrying amount SFr 150,500 SFr 167,600
Credit risk | Derivatives    
Related party long-term payables    
Financial assets, carrying amount 100  
Credit risk | Trade receivables    
Related party long-term payables    
Financial assets, carrying amount 366,200  
Credit risk | Cash and Cash Equivalents    
Related party long-term payables    
Financial assets, carrying amount SFr 273,700