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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2021 and December 31, 2020, respectively:
|  | March 31, 2021
Marketable Securities: |  | Adjusted Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Mutual and money market funds |  | $ | 100,704 |  |  | $ | 1,138 |  |  | $ | (146) |  |  | $ | 101,696 |
Corporate bonds |  | 23,448 |  |  | 206 |  |  | (63) |  |  | 23,591 |
Government securities - U.S. |  | 17,401 |  |  | 88 |  |  | (136) |  |  | 17,353 |
Other fixed-income securities |  | 3,155 |  |  | 16 |  |  | (8) |  |  | 3,163 |
Total |  | $ | 144,708 |  |  | $ | 1,448 |  |  | $ | (353) |  |  | $ | 145,803 |
|  | 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 March 31, 2021:
|  | Maturities
Marketable Debt Securities: |  | Less than 1 Year |  | 1-5 Years |  | 5-10 Years |  | Greater than 10 Years |  | Total
Corporate bonds |  | $ | 5,225 |  |  | $ | 17,352 |  |  | $ | 1,014 |  |  | $ | — |  |  | $ | 23,591 |
Government securities - U.S. |  | 2,109 |  |  | 11,440 |  |  | 1,883 |  |  | 1,921 |  |  | 17,353 |
Other fixed-income securities |  | 1,009 |  |  | 1,888 |  |  | 266 |  |  | — |  |  | 3,163 |
Total |  | $ | 8,343 |  |  | $ | 30,680 |  |  | $ | 3,163 |  |  | $ | 1,921 |  |  | $ | 44,107 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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