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Significant Accounting Policies (Schedule of Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Receivables | $ 260 | $ 286 | $ 270 | $ 266 | $ 260 | $ 270 | $ 284 | $ 270
Contract Liability | 193 | $ 212 | 231 | $ 235 | 193 | 231 | $ 215 | $ 232
Increase/(Decrease) [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Receivables | (26) |  | (14) |  | (6) |  |  |
Contract Liability | $ (19) |  | $ 16 |  | $ (42) | $ (1) |  |

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X
- Definition Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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