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Significant Balance Sheet Components (Tables) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Dec. 31, 2024
Significant Balance Sheet Components [Abstract] |  |
Schedule of Prepaid Expenses and Other Current Assets | Prepaid expenses and other current assets at June 30, 2025 and December 31, 2024, consisted of the following (in thousands):
|  | June 30, 2025 |  |  | December 31, 2024 |
Prepaid expenses |  | $ | 433 |  |  | $ | 1,200 |
Deposits |  |  | 34 |  |  |  | 46 |
Other current assets |  |  | 700 |  |  |  | 1,347 |
Total prepaid expenses and other current assets |  | $ | 1,167 |  |  | $ | 2,593 |
| Prepaid expenses and other current assets as of December 31, 2024 and 2023, consisted of the following (in thousands):
|  | 2024 |  |  | 2023 |
Prepaid expenses |  | $ | 1,200 |  |  | $ | 1,461 |
Deposits |  |  | 46 |  |  |  | 149 |
Other current assets |  |  | 1,347 |  |  |  | 1,893 |
Total prepaid expenses and other current assets |  | $ | 2,593 |  |  | $ | 3,503 |
Schedule of Other Non-Current Assets | Other non-current assets at June 30, 2025 and December 31, 2024, consisted of the following (in thousands):
|  | June 30, 2025 |  |  | December 31, 2024 |
Prepaid expenses, non-current |  | $ | 3,456 |  |  | $ | 3,474 |
Total other non-current assets |  | $ | 3,456 |  |  | $ | 3,474 |
| Other non-current assets as of December 31, 2024 and 2023, consisted of the following (in thousands):
|  | 2024 |  |  | 2023 |
Prepaid expenses, non-current |  | $ | 3,474 |  |  | $ | 3,368 |
Total other non-current assets |  | $ | 3,474 |  |  | $ | 3,368 |
Schedule of Accrued Expenses and Other Current Liabilities | Accrued expenses and other current liabilities at June 30, 2025 and December 31, 2024, consisted of the following (in thousands):
|  | June 30, 2025 |  |  | December 31, 2024 |
Accrued professional services |  | $ | 2,229 |  |  | $ | 2,091 |
Accrued payroll and benefits |  |  | 168 |  |  |  | 205 |
Accrued interest expense |  |  | 510 |  |  |  | 659 |
Other accrued expenses |  |  | 414 |  |  |  | 544 |
Total accrued expenses and other current liabilities |  | $ | 3,321 |  |  | $ | 3,499 |
| Accrued expenses and other current liabilities as of December 31, 2024 and 2023, consisted of the following (in thousands):
|  | 2024 |  |  | 2023 |
Accrued professional services |  | $ | 2,091 |  |  | $ | 714 |
Accrued payroll and benefits |  |  | 205 |  |  |  | 304 |
Accrued interest expense |  |  | 659 |  |  |  | 9 |
Other accrued expenses |  |  | 544 |  |  |  | 26 |
Total accrued expenses and other current liabilities |  | $ | 3,499 |  |  | $ | 1,053 |
Schedule of Property and Equipment, Net |  | Property and equipment, net as of December 31, 2024 and 2023, consisted of the following (in thousands):
|  | 2024 |  |  | 2023 |
Equipment |  |  | 23 |  |  |  | — |
Total property and equipment |  | $ | 23 |  |  | $ | — |
Less accumulated depreciation |  |  | (2 | ) |  |  | — |
Total property and equipment, net |  | $ | 21 |  |  | $ | — |

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