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4. Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2022
Payables and Accruals [Abstract] |
Schedule of Accrued Expenses | The components of accrued expenses as of December 31, 2022 and 2021 are as follows (in thousands): Schedule of Accrued Expenses
|  | 2022 |  |  | 2021 |
|  | Years Ended December 31, |
|  | 2022 |  |  | 2021 |
Clinical trial |  | $ | 88 |  |  | $ | 358 |
Employee benefits |  |  | 475 |  |  |  | 33 |
Other |  |  | 5 |  |  |  | 22 |
Total accrued expenses |  | $ | 568 |  |  | $ | 413 |

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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
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