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Income Taxes - Summary of Tax Loss Carryforwards (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Total | $ 73 us-gaap_OperatingLossCarryforwards |
Federal [Member] |  |
2022-2034 | 48,255 ACFN_NetOpertingLossCarryforwardsExpirationForStateLocalAndForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |
Unlimited |  |
Total | 48,255 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember | [1]
State [Member] |  |
2022-2034 | 20,854 ACFN_NetOpertingLossCarryforwardsExpirationForStateLocalAndForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Unlimited |  |
Total | 20,854 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Foreign [Member] |  |
2022-2034 |  |
Unlimited | 508 ACFN_NetOpertingLossCarryforwardsUnlimitedForStateLocalAndForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
Total | $ 508 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
[1] | The utilization of a portion of these net operating loss carryforwards is limited to a total of approximately $259 per year due to limits on utilizing the acquired net operating loss carryforwards under Internal Revenue Service regulations following a change in control.

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- Definition Net Operting Loss Carryforwards Expiration For State Local And Foreign. + References No definition available. + Details
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- Definition Net Operting Loss Carry forwards Unlimited For State Local And Foreign. + References No definition available. + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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