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v3.21.2

Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2021
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 |
June 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 1,007 |  |  | $ | 19 |  |  | $ | — |  |  | $ | 1,026 |
Municipal bonds |  |  | 969 |  |  |  | 2 |  |  |  | — |  |  |  | 971 |
Total available-for-sale securities |  | $ | 1,976 |  |  | $ | 21 |  |  | $ | — |  |  | $ | 1,997 |
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 |
Schedule of maturities of marketable securities classified as available-for-sale securities |
|  | Amortized cost |  |  | Estimated fair value |
Due within one year |  | $ | 959 |  |  | $ | 969 |
Due after one year through five years |  |  | 1,017 |  |  |  | 1,028 |
Due after five years |  |  | — |  |  |  | — |
Total available-for-sale securities |  | $ | 1,976 |  |  | $ | 1,997 |

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