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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities | The following tables show the Company’s available-for-sale securities’ adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category as of December 31, 2020 and 2019, respectively:
|  | 2020
Marketable Securities: |  | Adjusted Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Money market and mutual funds |  | $ | 103,404 |  |  | $ | 1,288 |  |  | $ | (20) |  |  | $ | 104,672 |
Corporate bonds |  | 21,811 |  |  | 350 |  |  | (6) |  |  | 22,155 |
Government securities - U.S. |  | 18,849 |  |  | 155 |  |  | (5) |  |  | 18,999 |
Other fixed-income securities |  | 3,839 |  |  | 22 |  |  | (7) |  |  | 3,854 |
Total |  | $ | 147,903 |  |  | $ | 1,815 |  |  | $ | (38) |  |  | $ | 149,680 |
|  | 2019
Marketable Securities: |  | Adjusted Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Equity securities |  | $ | 4,234 |  |  | $ | 170 |  |  | $ | — |  |  | $ | 4,404 |
Money market and mutual funds |  | 38,028 |  |  | 771 |  |  | — |  |  | 38,799 |
Corporate bonds |  | 4,021 |  |  | 77 |  |  | — |  |  | 4,098 |
Government securities - U.S. |  | 5,341 |  |  | 110 |  |  | (5) |  |  | 5,446 |
Other fixed-income securities |  | 1,614 |  |  | 23 |  |  | — |  |  | 1,637 |
Total |  | $ | 53,238 |  |  | $ | 1,151 |  |  | $ | (5) |  |  | $ | 54,384 |
Investments Classified by Contractual Maturity Date | The following table summarizes the estimated fair value of our investments in marketable debt securities, accounted for as available-for-sale securities and classified by the contractual maturity date of the securities as of December 31, 2020:
|  | Maturities
Marketable Debt Securities: |  | Less than 1 Year |  | 1-5 Years |  | 5-10 Years |  | Greater than 10 Years |  | Total
Corporate bonds |  | $ | 6,054 |  |  | $ | 14,468 |  |  | $ | 1,633 |  |  | $ | — |  |  | $ | 22,155 |
Government securities - U.S. |  | — |  |  | 13,827 |  |  | 2,038 |  |  | 3,134 |  |  | 18,999 |
Other fixed-income securities |  | 1,017 |  |  | 2,837 |  |  | — |  |  | — |  |  | 3,854 |
Total |  | $ | 7,071 |  |  | $ | 31,132 |  |  | $ | 3,671 |  |  | $ | 3,134 |  |  | $ | 45,008 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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