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Cash Equivalents And Restricted Securities | 6 Months Ended
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Jun. 30, 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
June 30, 2021 | Cost Basis |  | Gains |  | Value
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds | $ | 10,005 |  | $ | -- |  | $ | 10,005
Restricted securities: |  |  |  |  |  |  |  |
Money market funds |  | 554 |  |  | -- |  |  | 554
Total assets | $ | 10,559 |  | $ | -- |  | $ | 10,559
|  |  |  | 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 June 30, 2021 and December 31, 2020 $554,000 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 and six months ended June 30, 2021 and 2020. As of June 30, 2021 $554,000 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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