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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2022
Investments All Other Investments [Abstract] |
Cash Equivalents and Investments (Debt Securities) Classified as Available-for-sale Securities | Cash equivalents and investments (debt securities) which are classified as available-for-sale securities, consisted of the following (in thousands):
December 31, 2022 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Money market funds (cash equivalents) |  | $ | 21,666 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,666 |
Total financial assets |  | $ | 21,666 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,666 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 21,666 |
Total financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 21,666 |
December 31, 2021 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Money market funds (cash equivalents) |  | $ | 44,347 |  |  | $ | — |  |  | $ | — |  |  | $ | 44,347 |
U.S. government agency securities |  |  | 2,504 |  |  |  | — |  |  |  | — |  |  |  | 2,504 |
Total financial assets |  | $ | 46,851 |  |  | $ | — |  |  | $ | — |  |  | $ | 46,851 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 44,347 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,504 |
Total financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 46,851 |

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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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