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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale and Equity 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 September 30, 2021 and December 31, 2020, respectively:
|  | September 30, 2021
Marketable Securities: |  | Adjusted Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Mutual and money market funds |  | $ | 87,965 |  |  | $ | 1,083 |  |  | $ | (480) |  |  | $ | 88,568 |
Corporate bonds |  | 18,935 |  |  | 168 |  |  | (32) |  |  | 19,071 |
Government securities - U.S. |  | 13,503 |  |  | 64 |  |  | (105) |  |  | 13,462 |
Other fixed-income securities |  | 1,818 |  |  | 7 |  |  | (2) |  |  | 1,823 |
Total |  | $ | 122,221 |  |  | $ | 1,322 |  |  | $ | (619) |  |  | $ | 122,924 |
|  | December 31, 2020
Marketable Securities: |  | Adjusted Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Mutual and money market 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 |
Schedule of Contractual Maturity Dates | The following table summarizes the estimated fair value of our investments in marketable debt securities, accounted for as available-for-sale debt securities and classified by the contractual maturity date of the securities as of September 30, 2021:
|  | Maturities
Marketable Debt Securities: |  | Less than 1 Year |  | 1-5 Years |  | 5-10 Years |  | Greater than 10 Years |  | Total
Corporate bonds |  | $ | 4,733 |  |  | $ | 14,012 |  |  | $ | 326 |  |  | $ | — |  |  | $ | 19,071 |
Government securities - U.S. |  | 369 |  |  | 10,915 |  |  | 884 |  |  | 1,294 |  |  | 13,462 |
Other fixed-income securities |  | — |  |  | 1,170 |  |  | 653 |  |  | — |  |  | 1,823 |
Total |  | $ | 5,102 |  |  | $ | 26,097 |  |  | $ | 1,863 |  |  | $ | 1,294 |  |  | $ | 34,356 |

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