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Inventory (Details Narrative) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Inventory Write-down $ 101us-gaap_InventoryWriteDown $ 163us-gaap_InventoryWriteDown
Inventory Valuation Reserves 319us-gaap_InventoryValuationReserves 368us-gaap_InventoryValuationReserves
GridSense segment [Member]    
Inventory Write-down   152us-gaap_InventoryWriteDown
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_GridSenseSegmentMember
M2M Segment [Member]    
Inventory Write-down 88us-gaap_InventoryWriteDown
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_MTwoMSegmentMember
11us-gaap_InventoryWriteDown
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_MTwoMSegmentMember
PM [Member]    
Inventory Write-down $ 13us-gaap_InventoryWriteDown
/ us-gaap_StatementBusinessSegmentsAxis
= ACFN_PipelineMonitoringMember