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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2018
Financial Instruments [Abstract] |
Summary Of Financial Instruments Measured At Fair Value |
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﻿March 31, 2018 | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿Cash equivalents: |  |  |  |  |  |  |  |  |  |  |
﻿Money market funds | $ | 373 |  | $ | -- |  | $ | -- |  | $ | 373
﻿Restricted securities: |  |  |  |  |  |  |  |  |  |  |
﻿Money market funds |  | 808 |  |  | -- |  |  | -- |  |  | 808
﻿Total assets | $ | 1,181 |  | $ | -- |  | $ | -- |  | $ | 1,181
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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