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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2022
Investments Debt And Equity Securities [Abstract] |
Schedule of amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security |
|  | Amortized cost |  |  | Gross unrealized holding gains |  |  | Gross unrealized holding losses |  |  | Estimated fair value |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 1,434 |  |  | $ | 8 |  |  | $ | (2 | ) |  | $ | 1,440 |
Municipal bonds |  |  | 1,573 |  |  |  | — |  |  |  | (3 | ) |  |  | 1,570 |
Total available-for-sale securities |  | $ | 3,007 |  |  | $ | 8 |  |  | $ | (5 | ) |  | $ | 3,010 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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