Fair Value of ETC - Additional Information (Detail) |
Jun. 30, 2026
ETC
$ / shares
|
Dec. 31, 2025
ETC
$ / shares
|
|---|---|---|
| Fair Value Disclosures [Abstract] | ||
| Investment owned balance shares held by custodian | ETC | 10,850,162.7222992 | 10,985,516.92607291 |
| Ethereum classic Fair Value Per Share | $ / shares | $ 6.94 | $ 11.47 |