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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
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.

X

- Definition

Assets of corporate headquarters.

+ References

No definition available.

+ Details

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Namespace Prefix:	ACFN_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Assets of discontinued operations.

+ References

No definition available.

+ Details

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Namespace Prefix:	ACFN_
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Balance Type:	debit
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X

- Definition

Assets Reportable Segments.

+ References

No definition available.

+ Details

Name:	ACFN_AssetsReportableSegments
Namespace Prefix:	ACFN_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Unallocated assets of OmniMetrix headquarters.

+ References

No definition available.

+ Details

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Namespace Prefix:	ACFN_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

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Period Type:	instant

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- References

No definition available.

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