v3.26.1
Fair Value of Ether - Changes in Quantity of ETF and Respective Fair Value (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Ethereum
Jun. 30, 2025
USD ($)
Ethereum
Jun. 30, 2026
USD ($)
Ethereum
Jun. 30, 2025
USD ($)
Ethereum
Fair Value Disclosures [Abstract]        
Beginning balance, Quantity | Ethereum     733,993.75276361 470,875.75775088
Ether contributed, Quantity | Ethereum     281,172.01444297 106,063.76794599
Ether redeemed, Quantity | Ethereum     (167,278.76206736) (47,954.16582573)
Ether Staking Reward income, Quantity | Ethereum     7,699.21695012  
Ether distributed for Sponsor's Fee, related party, Quantity | Ethereum     (629.41907388) (314.96476721)
Ether distributed for Sponsor's Staking Fee, related party, Quantity | Ethereum     (314.12823728)  
Net change in unrealized appreciation/depreciation on investment in Ether, Quantity | Ethereum     0 0
Net realized loss on investment in Ether sold to pay expenses, Quantity | Ethereum     0 0
Net realized loss on investment in Ether sold to pay Sponsor's Staking Fee, Quantity | Ethereum     0  
Net realized gain (loss) loss on investment in Ether sold for redemption of Shares, Quantity | Ethereum     0 0
Ending Balance ,Quantity | Ethereum 854,642.67477818 528,670.39510393 854,642.67477818 528,670.39510393
Beginning Balance, Fair Value     $ 2,181,386 $ 1,572,914
Ether contributed, Fair Value     677,841 265,463
Ether redeemed, Fair Value     (369,689) (119,392)
Ether Staking Reward income, Fair Value     16,896  
Ether distributed for Sponsor's Fee, related party, Fair Value     (1,389) (729)
Ether distributed for Sponsor's Staking Fee, related party, Fair Value     (752)  
Net change in unrealized appreciation/depreciation on investment in Ether     (977,499) (346,430)
Net change in unrealized appreciation/depreciation on investment Sponsor's Staking Fee payable in Ether     (19)  
Net change in unrealized (appreciation) depreciation on investment in Ether $ (372,739) $ 335,217 (977,499) (346,430)
Net realized loss on investment in Ether sold to pay expenses (365) (188) (641) (310)
Net realized loss on investment in Ether sold to pay Sponsor's Staking Fee (144) 0 (259) 0
Net realized loss on investment in Ether sold for redemption of Shares (93,456) (6,067) (176,796) (41,260)
Ending balance, Fair Value $ 1,349,079 $ 1,330,256 $ 1,349,079 $ 1,330,256