v3.26.1
Summary of Significant Accounting Policies - Summary of Valuation Techniques and Observable Inputs Can Vary by Investment (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Assets        
Investment in ZEC $ 155,252 $ 200,441 $ 15,324 $ 22,040
Level 1        
Assets        
Investment in ZEC 155,252 200,441    
Level 2        
Assets        
Investment in ZEC 0 0    
Level 3        
Assets        
Investment in ZEC $ 0 $ 0