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Cash Equivalents And Restricted Securities | 12 Months Ended
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Dec. 31, 2017
Cash Equivalents And Restricted Securities [Abstract] |
Cash Equivalents And Restricted Securities | 3. 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, 2017 | Cost Basis |  | Gains (Losses) |  | Value
﻿Cash equivalents: |  |  |  |  |  |  |  |
﻿Money market funds | $ | 372 |  |  | -- |  | $ | 372
﻿Restricted securities: |  |  |  |  |  |  |  |
﻿Money market funds |  | 776 |  |  | -- |  |  | 776
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  | Unrealized |  | Estimated
﻿ |  |  |  | Holding |  | Market
﻿December 31, 2016 | Cost Basis |  | Gains (Losses) |  | Value
﻿Cash equivalents: |  |  |  |  |  |  |  |
﻿Money market funds | $ | 3,466 |  | $ | -- |  | $ | 3,466
﻿Restricted securities: |  |  |  |  |  |  |  |
﻿Money market funds |  | 699 |  |  | -- |  |  | 699
﻿ |  |  |  |  |  |  |  |
As of December 31, 2017 and 2016 $776,000 and $699,000, 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, 2017, 2016, and 2015. As of December 31, 2017 $537,000 of our restricted securities had a maturity date within three months and $239,000 had a maturity date between three months and one year. As of December 31, 2016 $490,000 of our restricted securities had a maturity date within three months and $209,000 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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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