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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 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 |
March 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 511 |  |  | $ | 1 |  |  | $ | (13) |  |  | $ | 499 |
Municipal bonds |  |  | 454 |  |  |  | — |  |  |  | (13) |  |  |  | 441 |
Total available-for-sale securities |  | $ | 965 |  |  | $ | 1 |  |  | $ | (26) |  |  | $ | 940 |
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 |
Schedule of maturities of marketable securities classified as available-for-sale securities |
|  | Amortized cost |  |  | Estimated fair value |
Due within one year |  | $ | 402 |  |  | $ | 398 |
Due after one year through five years |  |  | 563 |  |  |  | 542 |
Due after five years |  |  | — |  |  |  | — |
Total available-for-sale securities |  | $ | 965 |  |  | $ | 940 |
Schedule of available-for-sale marketable securities with continuous 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 March 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 254 |  |  | $ | 8 |  |  | $ | 144 |  |  | $ | 5 |  |  | $ | 398 |  |  | $ | 13 |
Municipal bonds |  |  | 292 |  |  |  | 11 |  |  |  | 150 |  |  |  | 2 |  |  |  | 442 |  |  |  | 13 |
Total |  | $ | 546 |  |  | $ | 19 |  |  | $ | 294 |  |  | $ | 7 |  |  | $ | 840 |  |  | $ | 26 |

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- Definition Tabular disclosure of maturities of available-for-sale securities. + References No definition available. + Details
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- Definition Tabular disclosure of fair value of investment in marketable security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References No definition available. + Details
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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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