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Cash Equivalents And Restricted Cash And Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Cash Equivalents And Restricted Cash And Securities [Abstract] |
Summary Of Cash Equivalents And Restricted Cash And Securities |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  | 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
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  | 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
﻿ |  |  |  |  |  |  |  |
﻿

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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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