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Cash Equivalents And Restricted Securities | 3 Months Ended
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Mar. 31, 2021
Cash Equivalents And Restricted Securities [Abstract] |
Cash Equivalents And Restricted Securities | 5. Cash Equivalents and Restricted Securities The following is a summary of cash equivalents and restricted securities (in thousands):
|  |  |  | Unrealized |  | Estimated
|  |  |  | Holding |  | Market
March 31, 2021 | Cost Basis |  | Gains |  | Value
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds | $ | 10,006 |  | $ | -- |  | $ | 10,006
Restricted securities: |  |  |  |  |  |  |  |
Money market funds |  | 550 |  |  | -- |  |  | 550
Total assets | $ | 10,556 |  | $ | -- |  | $ | 10,556
|  |  |  | Unrealized |  | Estimated
|  |  |  | Holding |  | Market
December 31, 2020 | Cost Basis |  | Gains |  | Value
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds | $ | 11,484 |  | $ | -- |  | $ | 11,484
Restricted securities: |  |  |  |  |  |  |  |
Money market funds |  | 546 |  |  | -- |  |  | 546
Total assets | $ | 12,030 |  | $ | -- |  | $ | 12,030
As of March 31, 2021 and December 31, 2020 $550,000 and $546,000, respectively, of our money market funds were designated as short-term restricted securities due to a contractual commitment to hold the securities as pledged collateral relating to international tax obligations. There were no gross realized gains or losses on cash equivalents and restricted securities in the three months ended March 31, 2021 and 2020. As of March 31, 2021 $550,000 of our restricted securities had a maturity date within three months. As of December 31, 2020 $546,000 of our restricted securities had a maturity date within three months.

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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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