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Share-Based Compensation - Schedule of BitAccess Plan Stock Option Activity (Detail) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Employee Stock Option | Bit Access Plan [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Options - Beginning balance | 43,780 | 43,780 | 43,780 |
Options - Granted | 0 | 0 |  |
Options - Exercised | 0 | 0 |  |
Options - End balance | 43,780 | 43,780 | 43,780 | 43,780
Options - Vested and exercisable | 30,153 | 20,208 |  |
Weighted-average exercise price - Beginning balance | $ 2.86 | $ 2.86 | $ 2.86 |
Weighted-average exercise price - Granted | 0 | 0 |  |
Weighted-average exercise price - Exercised | 0 | 0 |  |
Weighted-average exercise price - End balance | 2.86 | 2.86 | $ 2.86 | $ 2.86
Weighted-average exercise price - Vested and exercisable | $ 2.86 | $ 2.86 |  |
Weighted-average remaining contractual term - Outstanding | 6 years 10 months 6 days | 7 years 10 months 6 days | 7 years 7 months 6 days | 8 years 7 months 6 days
Weighted-average remaining contractual term - Vested and exercisable | 6 years 9 months 10 days |  |  |
Weighted-average grant-date fair value - Outstanding | $ 3.09 | $ 3.09 | $ 3.09 | $ 1.21
Weighted-average grant-date fair value - Granted | 0 | 0 |  |
Weighted-average grant-date fair value - Exercised | 0 | 0 |  |
Weighted-average grant-date fair value - Vested and exercisable | 3.05 | 3.1 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Weighted-average grant-date fair value - Vested and exercisable | $ 2.36 | $ 3.6 |  |

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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Line items represent financial concepts included in a table. 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