Fair Value of ETC - Additional Information (Detail) |
Sep. 30, 2025
ETC
$ / shares
|
Dec. 31, 2024
ETC
$ / shares
|
|---|---|---|
| Fair Value Disclosures [Abstract] | ||
| Investment owned balance shares held by custodian | ETC | 11,054,961.67837105 | 11,263,626.2550315 |
| Ethereum classic Fair Value Per Share | $ / shares | $ 18.38 | $ 25.13 |