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Cash Equivalents And Restricted Securities | 6 Months Ended
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Jun. 30, 2019
Cash Equivalents And Restricted Securities [Abstract] |
Cash Equivalents And Restricted Securities | 3. Cash Equivalents and Restricted Securities The following is a summary of cash equivalents and restricted securities (in thousands):
|  |  |  | Unrealized |  | Estimated
|  |  |  | Holding |  | Market
June 30, 2019 | Cost Basis |  | Gains |  | Value
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds | $ | 1,458 |  | $ | -- |  | $ | 1,458
Restricted securities: |  |  |  |  |  |  |  |
Money market funds |  | 508 |  |  | -- |  |  | 508
|  |  |  | Unrealized |  | Estimated
|  |  |  | Holding |  | Market
December 31, 2018 | Cost Basis |  | Gains |  | Value
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds | $ | 1,445 |  | $ | -- |  | $ | 1,445
Restricted securities: |  |  |  |  |  |  |  |
Money market funds |  | 747 |  |  | -- |  |  | 747
As of June 30, 2019 and December 31, 2018 all 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 and restricted securities in the three and six months ended June 30, 2019 and 2018. As of June 30, 2019 $508,000 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 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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