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Segment Reporting and Geographic Information - Reconciliation of Segment Data to Consolidated Statement Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Segment Reporting [Abstract] |  |  |
Total assets for reportable segments |  | $ 2,844 | $ 2,552
Assets of discontinued operations |  |  | 119
Unallocated assets of OmniMetrix headquarters |  | 87 | 213
Assets of corporate headquarters | [1] | 6,291 | 6,356
Total consolidated assets |  | $ 9,222 | $ 9,240
[1] | Includes the investment in DSIT of $5,800 at December 31, 2017. Includes the investment in DSIT of $5,658 and the escrow deposit of $579 from the 2016 DSIT Transaction at December 31, 2016.

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- Definition Assets of corporate headquarters. + References No definition available. + Details
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- Definition Assets of discontinued operations. + References No definition available. + Details
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- Definition Assets Reportable Segments. + References No definition available. + Details
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- Definition Unallocated assets of OmniMetrix headquarters. + References No definition available. + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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