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v3.20.2

Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 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 |
September 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 1,714 |  |  | $ | 32 |  |  | $ | (5 | ) |  | $ | 1,741 |
Municipal bonds |  |  | 1,266 |  |  |  | 6 |  |  |  | — |  |  |  | 1,272 |
Total available-for-sale securities |  | $ | 2,980 |  |  | $ | 38 |  |  | $ | (5 | ) |  | $ | 3,013 |
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 cost |  |  | Estimated fair value |
Due within one year |  | $ | 1,610 |  |  | $ | 1,622 |
Due after one year through five years |  |  | 1,370 |  |  |  | 1,391 |
Due after five years |  |  | — |  |  |  | — |
Total available-for-sale securities |  | $ | 2,980 |  |  | $ | 3,013 |
Schedule of available-for-sale marketable securities in a gross unrealized loss position |
|  | Less than 12 months |  |  | More than 12 months |  |  | Total |
|  | Estimated fair value |  |  | Gross unrealized holding losses |  |  | Estimated fair value |  |  | Gross unrealized holding losses |  |  | Estimated fair value |  |  | Gross unrealized holding losses |
As of September 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 192 |  |  | $ | 5 |  |  | $ | — |  |  | $ | — |  |  | $ | 192 |  |  | $ | 5 |
Municipal bonds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 192 |  |  | $ | 5 |  |  | $ | — |  |  | $ | — |  |  | $ | 192 |  |  | $ | 5 |

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