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Stockholders’ Equity (Tables) | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Schedule of Fair Value Assumptions For Pre-funded, Series A and Series B Warrants Issued | The following table represents the significant fair value assumptions used for the Pre-funded, Series A, and Series B warrants issued or revalued during the three and nine months ended September 30, 2025. Schedule of Fair Value Assumptions For Pre-funded, Series A and Series B Warrants Issued
|  | Three and Nine Months ended September 30, 2025 |
Stock price |  | $ | 0.60- 3.50 |
Exercise price |  | $ | 0.001- 0.55 |
Expected term in years |  |  | 1.79 – 5.00 |
Expected dividend yield |  |  | 0.00 | %
Volatility |  |  | 130.0 – 140.0 | %
Risk-free interest rate |  |  | 3.51- 3.99 | %
Schedule of Reserved Shares of Common Stock for Future Issuance | The Company had reserved common shares for future issuance as follows as of September 30, 2025: Schedule of Reserved Shares of Common Stock for Future Issuance
Stock options outstanding |  |  | 2,645 |
Restricted stock units outstanding |  |  | 199,190 |
Warrants outstanding* |  |  | 5,722,890 |
Series B Preferred Stock outstanding |  |  | 1,250,000 |
Number of common shares reserved |  |  | 7,174,725 |
* |  | The Company noted that there are 7,722,890 warrants outstanding as of September 30, 2025. However, as noted in Note 8, on September 28, 2025, the Company executed a side letter with the Holder in relation to the Generate Common Warrants to waive a clause that requires the Company to reserve 2.0 million shares of common stock until there is an increase in the authorized shares of the Company. Accordingly, 2.0 million warrants were not included in the reservation of common shares balance.
Schedule of Basic and Diluted Per Share Computations for Continuing Operations | The following table sets forth the reconciliation of the numerators and denominators of the basic and diluted per share computations for operations for the three and nine months ended September 30: Schedule of Basic and Diluted Per Share Computations for Continuing Operations
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
(Dollars in thousands, except shares) |  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (25,787 | ) |  | $ | (8,093 | ) |  | $ | (40,921 | ) |  | $ | (19,782 | )
(Less) Net income (loss) attributable to non-controlling interest |  |  | (1,831 | ) |  |  | (903 | ) |  |  | (2,027 | ) |  |  | 3,535 |
Net loss attributable to Soluna Holdings, Inc. |  |  | (23,956 | ) |  |  | (7,190 | ) |  |  | (38,894 | ) |  |  | (23,317 | )
Less: Preferred dividends or deemed dividends |  |  | (3,840 | ) |  |  | - |  |  |  | (3,840 | ) |  |  | (452 | )
Less: Cumulative Preferred Dividends in arrears |  |  | (2,950 | ) |  |  | (2,786 | ) |  |  | (8,858 | ) |  |  | (7,117 | )
Balance |  | $ | (30,746 | ) |  | $ | (9,976 | ) |  | $ | (51,592 | ) |  | $ | (30,886 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares outstanding, beginning of period, including penny warrants and excluding restricted stock awards not vested |  |  | 8,106,814 |  |  |  | 2,592,454 |  |  |  | 8,106,814 |  |  |  | 2,592,454 |
Weighted average common shares issued during the period including penny warrants issued and outstanding and excluding restricted stock awards not vested as of quarter-end |  |  | 18,876,209 |  |  |  | 3,795,880 |  |  |  | 7,576,258 |  |  |  | 1,728,091 |
Denominator for basic and diluted earnings per common shares — weighted average common shares |  |  | 26,983,023 |  |  |  | 6,388,335 |  |  |  | 15,683,072 |  |  |  | 4,320,546 |
Basic and diluted loss per share |  | $ | (1.14 | ) |  | $ | (1.56 | ) |  | $ | (3.29 | ) |  | $ | (7.15 | )

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