Summary of Significant Accounting Policies (Tables)
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12 Months Ended |
Dec. 31, 2025 |
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| Accounting Policies [Abstract] |
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| Schedule of Property, Machinery and Equipment, Net |
The estimated useful lives of fixed assets by asset category are described below: | | | | | | | | | Fixed Assets | | Estimated Useful Life | Computer equipment | | Three years | Furniture and fixtures | | Five years | Leasehold improvements | | Lesser of estimated useful life or remaining lease term (one year to seven years) | Machinery and equipment | | Seven years |
Property, machinery and equipment, net consisted of the following: | | | | | | | | | | | | | (in thousands) | December 31,
2025 | | December 31,
2024 | | Computer equipment | $ | 21 | | | $ | 10 | | | | | | | Leasehold improvements | 2,391 | | | 2,391 | | | Machinery and equipment | 2,839 | | | 2,839 | | | | | | | Property, machinery and equipment, gross | 5,251 | | | 5,240 | | | Less: accumulated depreciation | (4,298) | | | (3,058) | | | Property, machinery and equipment, net | $ | 953 | | | $ | 2,182 | |
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| Schedule of Disaggregation of Revenue |
The disaggregation of revenue by type is as follows: | | | | | | | | | | | | | | | | | | | Year Ended
December 31, | | (in thousands) | | | | | 2025 | | 2024 | | | | | | | | | | | | | | | | | | Forfeited customer deposits | | | | | $ | 162 | | | $ | 307 | | | Engineering project services | | | | | 948 | | | 1,807 | | | Total revenue | | | | | $ | 1,110 | | | $ | 2,114 | |
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| Schedule of Changes in Fair Value of Liabilities |
The change in fair value of the Credit Provision Derivative asset subject to recurring remeasurement was as follows: | | | | | | | | | | | (in thousands) | | | | | | | Balance, December 31, 2023 and 2024 | $ | — | | | | | | | Issuance | — | | | | | | | Change in fair value | 164 | | | | | | | Balance, December 31, 2025 | $ | 164 | | | | | |
The change in fair values of liabilities subject to recurring remeasurement were as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | (in thousands) | Warrant Liability (Level 3) | | May 2025 Loan (Level 3) | | May 2025 Convertible Note (Level 3) | | AIR Warrants (Level 3) | | ELOC Pre-funded Warrants (Level 3) | | | | | | Balance, December 31, 2023 and 2024 | $ | 3 | | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | | | | | Issuance | — | | | 178 | | | 1,406 | | | 1,907 | | | 837 | | | | | | | Principal payment | — | | | (101) | | | — | | | — | | | — | | | | | | | Change in fair value | — | | | 835 | | | (1,075) | | | (1,907) | | | (423) | | | | | | | Extinguishment | — | | | (912) | | | — | | | — | | | — | | | | | | | Exercise | — | | | — | | | — | | | — | | | (414) | | | | | | | Balance, December 31, 2025 | $ | 3 | | | $ | — | | | $ | 331 | | | $ | — | | | $ | — | | | | | |
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| Schedule of Fair Value Inputs |
Key assumptions used to determine the fair value of the May 2025 Convertible Note as of December 31, 2025, were as follows: | | | | | | | Expected term (years) | 0.96 | | Stock price | $ | 4.87 | | | Volatility | 45.00 | % | | Risk-free rate | 3.49 | % | | Dividend yield | — | % |
| | | | | | | | | | | | | Underlying Investor Warrants (BSM) | | Junior Convertible Notes | | Expected term (years) | 5.00 | | 0.92 | | Stock price | $ | 4.87 | | | $ | 4.87 | | | Volatility | 87.50% | | 45.00 | % | | Risk-free rate | 3.73 | % | | 3.50 | % | | Dividend yield | — | % | | — | % | | Discount rate on the note | 78.64 | % | | 78.64 | % | | Exercise price of AIR Warrants (millions) | $ | 3.7 | | | $ | 3.7 | |
| | | | | | | | | | | | | Underlying Investor Warrants (BSM) | | Junior Convertible Notes | | Expected term (years) | 5.00 | | 0.92 | | Stock price | $ | 22.13 | | | $ | 22.13 | | | Volatility | 87.50% | | 45.00% | | Risk-free rate | 3.75 | % | | 3.49 | % | | Dividend yield | — | % | | — | % | | Discount rate on the note | N/A | | 78.64 | % | | Exercise price of AIR Warrants (millions) | $ | 3.7 | | | $ | 3.7 | |
| | | | | | | Expected term (years) | 5.00 | | Stock price | $ | 29.99 | | | Volatility | 90.00 | % | | Risk-free rate | 4.04 | % | | Dividend yield | 0.00 | % |
| | | | | | | Expected term (years) | 5.00 | | Stock price | $ | 20.17 | | | Volatility | 90.00 | % | | Risk-free rate | 3.84 | % | | Dividend yield | 0.00 | % |
| | | | | | | Expected term (years) | 5.01 | | Stock price | $ | 105.67 | | | Volatility | 100.00 | % | | Risk-free rate | 4.25 | % | | Dividend yield | 0.00 | % |
| | | | | | | Expected term (years) | 5.50 | | Stock price | $ | 132.27 | | | Volatility | 97.50 | % | | Risk-free rate | 4.05 | % | | Dividend yield | 0.00 | % |
| | | | | | | Expected term (years) | 5.44 | | Stock price | $ | 157.44 | | | Volatility | 97.50 | % | | Risk-free rate | 4.33 | % | | Dividend yield | 0.00 | % |
| | | | | | | Expected term (years) | 5.38 | | Stock price | $ | 139.94 | | | Volatility | 97.50 | % | | Risk-free rate | 4.08 | % | | Dividend yield | 0.00 | % |
| | | | | | | Expected term (years) | 5.00 | | Stock price | $ | 21.42 | | | Volatility | 87.50 | % | | Risk-free rate | 3.57 | % | | Dividend yield | 0.00 | % |
| | | | | | | | | | | | | Pre-modification | | Post-modification | | Expected term (years) | 4.63 | | 4.63 | | Stock price | $ | 21.42 | | | $ | 21.42 | | | Exercise price | $ | 132.27 | | | $ | 19.81 | | | Volatility | 87.50 | % | | 87.50 | % | | Risk-free rate | 3.55 | % | | 3.55 | % | | Dividend yield | 0.00 | % | | 0.00 | % |
| | | | | | | Expected term (years) | 5.00 | | Stock price | $ | 14.28 | | | Volatility | 82.50 | % | | Risk-free rate | 3.72 | % | | Dividend yield | 0.00 | % |
| | | | | | | Expected term (years) | 4.77 | | Stock price | $ | 13.57 | | | Volatility | 82.50 | % | | Risk-free rate | 3.76 | % | | Dividend yield | 0.00 | % |
| | | | | | | Expected term (years) | 5.15 | | Stock price | $ | 16.96 | | | Volatility | 82.50 | % | | Risk-free rate | 3.73 | % | | Dividend yield | 0.00 | % |
| | | | | | | | | | | | | Pre-modification | | Post-modification | | Expected term (years) | 5.16 | | 5.16 | | Stock price | $ | 13.57 | | | $ | 13.57 | | | Volatility | 82.50 | % | | 82.50 | % | | Risk-free rate | 3.79 | % | | 3.79 | % | | Dividend yield | 0.00 | % | | 0.00 | % |
| | | | | | | | | | | | | March 2025 Warrants | | July 2025 Warrants | | Expected term (years) | 4.44 | | 4.71 | | Stock price | $ | 30.52 | | | $ | 30.52 | | | Volatility | 85.00 | % | | 85.00 | % | | Risk-free rate | 3.56 | % | | 3.58 | % | | Dividend yield | 0.00 | % | | 0.00 | % |
| | | | | | | Expected term (years) | 5.31 | | Stock price | $ | 30.52 | | | Volatility | 85.00 | % | | Risk-free rate | 3.63 | % | | Dividend yield | 0.00 | % |
| | | | | | | | | | | | | | | | | | | As of December 2, 2025 | December 2024 Wolverine Warrants | | Initial Tranche Warrants | | Second Tranche Warrants | | Expected term (years) | 4.04 | | 4.50 | | 4.58 | | Stock price | $ | 11.96 | | | $ | 11.96 | | | $ | 11.96 | | | Exercise price before repricing | $ | 19.81 | | | $ | 19.81 | | | $ | 19.81 | | | Exercise price after repricing | $ | 9.64 | | | $ | 9.64 | | | $ | 9.64 | | | Volatility | 85.00 | % | | 85.00 | % | | 85.00 | % | | Risk-free rate | 3.60 | % | | 3.63 | % | | 3.63 | % | | Dividend yield | 0.00 | % | | 0.00 | % | | 0.00 | % |
| | | | | | | | | | | | | | | | | | | As of December 19, 2025 | December 2024 Wolverine Warrants | | Initial Tranche Warrants | | Second Tranche Warrants | | Expected term (years) | 3.99 | | 4.46 | | 4.53 | | Stock price | $ | 8.73 | | | $ | 8.73 | | | $ | 8.73 | | | Exercise price before repricing | $ | 9.64 | | | $ | 9.64 | | | $ | 9.64 | | | Exercise price after repricing | $ | 9.05 | | | $ | 9.05 | | | $ | 9.05 | | | Volatility | 85.00 | % | | 85.00 | % | | 85.00 | % | | Risk-free rate | 3.61 | % | | 3.65 | % | | 3.66 | % | | Dividend yield | 0.00 | % | | 0.00 | % | | 0.00 | % |
| | | | | | | | | | | | | | | | | | | As of December 31, 2025 | December 2024 Wolverine Warrants | | Initial Tranche Warrants | | Second Tranche Warrants | | Expected term (years) | 3.96 | | 4.43 | | 4.50 | | Stock price | $ | 4.87 | | | $ | 4.87 | | | $ | 4.87 | | | Exercise price before repricing | $ | 9.05 | | | $ | 9.05 | | | $ | 9.05 | | | Exercise price after repricing | $ | 5.70 | | | $ | 5.70 | | | $ | 5.70 | | | Volatility | 87.50 | % | | 87.50 | % | | 87.50 | % | | Risk-free rate | 3.64 | % | | 3.68 | % | | 3.69 | % | | Dividend yield | 0.00 | % | | 0.00 | % | | 0.00 | % |
| | | | | | | | | | | | | | | | | | | February 2025 Warrants | | Investor Modified Warrants | | Warrant term (years) | 4.49 | | 4.35 | - | 4.70 | | Stock price | $ | 34.09 | | | $ | 34.09 | | | Volatility | 87.50 | % | | 87.50 | % | | Risk-free rate | 3.74 | % | | 3.73 | % | - | 3.75% | | Dividend yield | 0.00 | % | | 0.00 | % |
| | | | | | | Warrant term (years) | 5.09 | | Stock price | $ | 34.09 | | | Volatility | 87.50 | % | | Risk-free rate | 3.78 | % | | Dividend yield | 0.00 | % |
| | | | | | | | | | | | | | | | | | | | | | | | | Pre-modification | | Pre-modification | | Warrant term (years) | 4.47 | - | 4.82 | | 4.47 | - | 4.82 | | Stock price | $ | 21.78 | | | $ | 21.78 | | | Volatility | 90.00 | % | | 90.00 | % | | Risk-free rate | 3.76 | % | - | 3.78% | | 3.76 | % | - | 3.78% | | Dividend yield | 0.00 | % | | 0.00 | % |
| | | | | | | | | | | | | December 2024 Warrants | | December 2024 Placement Agent Warrants | | Warrant term (years) | 5 | | 5 | | | | | | Volatility | 97.50 | % | | 97.50 | % | | Risk-free rate | 4.40 | % | | 4.40 | % | | Dividend yield | — | % | | — | % |
| | | | | | | | | | | | | | | | | | | September 2024 Class A Warrants | | September 2024 Class B Warrants | | September 2024 Placement Agent Warrants | | Warrant term (years) | 5.50 | | 1.50 | | 1.49 | | | | | | | | Volatility | 97.50 | % | | 97.50 | % | | 97.50 | % | | Risk-free rate | 3.46 | % | | 3.79 | % | | 3.79 | % | | Dividend yield | — | % | | — | % | | — | % |
| | | | | | | Warrant term (years) | 5.00 | | | | Volatility | 97.50 | % | | Risk-free rate | 4.07 | % | | Dividend yield | — | % |
| | | | | | | | | | | | | Pre-modification | | Post-modification | | Warrant term (years) | 4.87 | | 5.00 | | | | | | Volatility | 95.00 | % | | 95.00 | % | | Risk-free rate | 4.22 | % | | 4.21 | % | | Dividend yield | 0.00 | % | | 0.00 | % |
| | | | | | | Expected term (years) | 5.00 | | | | Volatility | 97.50 | % | | Risk-free rate | 4.02 | % | | Dividend yield | — | % |
| | | | | | | | | | | | | Pre-modification | | Post-modification | | Expected term (years) | 4.83 | | 5.00 | | | | | | Volatility | 97.50 | % | | 97.50 | % | | Risk-free rate | 3.85 | % | | 3.84 | % | | Dividend yield | 0.00 | % | | 0.00 | % |
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