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Cash Equivalents And Restricted Cash And Securities | 12 Months Ended
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Dec. 31, 2019
Cash Equivalents And Restricted Cash And Securities [Abstract] |
Cash Equivalents And Restricted Cash And Securities | 5. Cash Equivalents and Restricted Cash and Securities The following is a summary of cash equivalents and marketable securities (in thousands):
|  |  |  | Unrealized |  | Estimated
|  |  |  | Holding |  | Market
December 31, 2019 | Cost Basis |  | Gains (Losses) |  | Value
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds | $ | 1,472 |  |  | -- |  | $ | 1,472
Restricted securities: |  |  |  |  |  |  |  |
Money market funds |  | 528 |  |  | -- |  |  | 528
|  |  |  | Unrealized |  | Estimated
|  |  |  | Holding |  | Market
December 31, 2018 | Cost Basis |  | Gains (Losses) |  | Value
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds | $ | 1,445 |  |  | -- |  | $ | 1,445
Restricted securities: |  |  |  |  |  |  |  |
Money market funds |  | 747 |  |  | -- |  |  | 747
As of December 31, 2019 and 2018 $528,000 and $747,000, 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 primarily to international tax obligations. There were no gross realized gains or losses on cash equivalents or restricted securities for the years ended December 31, 2019, 2018, and 2017. As of December 31, 2019, $528,000 of our restricted securities had a maturity date within three months. As of December 31, 2018, $512,000 of our restricted securities had a maturity date within three months and $235,000 of our restricted securities had a maturity date between three months and one year.

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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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