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Marketable Securities | 3 Months Ended
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Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities The Company has investments in equity and available-for-sale debt securities which are recorded at fair market value. The change in the fair value of equity investments is recognized in our unaudited condensed consolidated statements of loss and the change in the fair value of available-for-sale debt investments is recorded as other comprehensive loss in shareholders’ equity, net of income tax effects. As of March 31, 2021, we considered any decreases in fair value on our marketable securities to be driven by factors other than credit risk, including market risk. 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 |
We determine realized gains or losses on the sale of marketable securities on a specific identification method. We reflect these gains and losses as a component of investment and other income in the accompanying unaudited condensed consolidated statements of loss. We recognized gross realized gains of $11 and $276 for the three months ended March 31, 2021 and 2020, respectively. These realized gains were offset by realized losses of $68 and $872 for the three months ended March 31, 2021 and 2020, respectively. 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 |
We have classified our investment in available-for-sale marketable debt securities as current assets in the unaudited condensed consolidated balance sheets as the securities need to be available for use, if required, to fund current operations. There are no restrictions on the sale of any securities in our investment portfolio. Total gross unrealized losses of our available-for-sale debt securities at March 31, 2021 were immaterial. The unrealized losses are driven by factors other than credit risk and have been in an unrealized loss position for less than one year. We do not intend to sell the investments and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases.

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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