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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Financial Instruments [Abstract] |
Summary Of Financial Instruments Measured At Fair Value |
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﻿December 31, 2018 | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿Cash equivalents: |  |  |  |  |  |  |  |  |  |  |
﻿Money market funds | $ | 1,445 |  |  | -- |  |  | -- |  | $ | 1,445
﻿Restricted securities: |  |  |  |  |  |  |  |  |  |  |
﻿Money market funds |  | 747 |  |  | -- |  |  | -- |  |  | 747
﻿Total assets | $ | 2,192 |  | $ | -- |  | $ | -- |  | $ | 2,192
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﻿December 31, 2017 | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿Cash equivalents: |  |  |  |  |  |  |  |  |  |  |
﻿Money market funds | $ | 372 |  | $ | -- |  | $ | -- |  | $ | 372
﻿Restricted securities: |  |  |  |  |  |  |  |  |  |  |
﻿Money market funds |  | 776 |  |  | -- |  |  | -- |  |  | 776
﻿Total assets | $ | 1,148 |  | $ | -- |  | $ | -- |  | $ | 1,148
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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