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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Marketable Securities |
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, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 1,312 |  |  |  | 26 |  |  |  | — |  |  |  | 1,338 |
Municipal bonds |  |  | 1,536 |  |  |  | 5 |  |  |  | — |  |  |  | 1,541 |
Total available-for-sale securities |  | $ | 2,848 |  |  |  | 31 |  |  |  | — |  |  |  | 2,879 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 1,814 |  |  | $ | 21 |  |  | $ | (3 | ) |  | $ | 1,832 |
Municipal bonds |  |  | 2,707 |  |  |  | 5 |  |  |  | (1 | ) |  |  | 2,711 |
Total available-for-sale securities |  | $ | 4,521 |  |  | $ | 26 |  |  | $ | (4 | ) |  | $ | 4,543 |
Schedule of maturities of marketable securities classified as available-for-sale securities |
|  | Amortized |  |  | Estimated |
|  | cost |  |  | fair value |
Due within one year |  | $ | 1,106 |  |  |  | 1,117 |
Due after one year through five years |  |  | 1,742 |  |  |  | 1,762 |
Total available-for-sale securities |  | $ | 2,848 |  |  |  | 2,879 |

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