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3. Short-Term Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |
Schedule of Short-Term Marketable Securities | The tables summarize the Company’s short-term marketable securities as of December 31, 2022. There were no short-term marketable securities as of December 31, 2021 (in thousands): Schedule of Short-Term Marketable Securities
|  | Amortized Cost Basis |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury bills |  | $ | 2,032 |  |  | $ | 17 |  |  | $ | - |  |  | $ | 2,049 |
|  | $ | 2,032 |  |  | $ | 17 |  |  | $ | - |  |  | $ | 2,049 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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