Summary of Significant Accounting Policies (Details 1) (USD $)
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Dec. 31, 2014
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Dec. 31, 2013
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Jun. 24, 2014
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Summary Of Significant Accounting Policies [Line Items] |
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Derivative Liabilities |
$ 0us-gaap_DerivativeLiabilitiesCurrent
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$ 6,277,000us-gaap_DerivativeLiabilitiesCurrent
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Fair Value, Inputs, Level 1 [Member] |
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Summary Of Significant Accounting Policies [Line Items] |
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Derivative Liabilities |
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0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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Fair Value, Inputs, Level 2 [Member] |
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Summary Of Significant Accounting Policies [Line Items] |
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Derivative Liabilities |
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0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Fair Value, Inputs, Level 3 [Member] |
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Summary Of Significant Accounting Policies [Line Items] |
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Derivative Liabilities |
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6,277,000us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
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Convertible Notes Payable [Member] |
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Summary Of Significant Accounting Policies [Line Items] |
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Derivative Liabilities |
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5,573,000us-gaap_DerivativeLiabilitiesCurrent / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_ConvertibleNotesPayableMember
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Convertible Notes Payable [Member] | Fair Value, Inputs, Level 1 [Member] |
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Summary Of Significant Accounting Policies [Line Items] |
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Derivative Liabilities |
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0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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Convertible Notes Payable [Member] | Fair Value, Inputs, Level 2 [Member] |
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Summary Of Significant Accounting Policies [Line Items] |
|
|
|
Derivative Liabilities |
|
0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Convertible Notes Payable [Member] | Fair Value, Inputs, Level 3 [Member] |
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|
|
Summary Of Significant Accounting Policies [Line Items] |
|
|
|
Derivative Liabilities |
|
5,573,000us-gaap_DerivativeLiabilitiesCurrent / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
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Financing Warrant [Member] |
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Summary Of Significant Accounting Policies [Line Items] |
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Derivative Liabilities |
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175,000us-gaap_DerivativeLiabilitiesCurrent / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = watt_FinancingWarrantMember
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1,733,000us-gaap_DerivativeLiabilitiesCurrent / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = watt_FinancingWarrantMember
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Financing Warrant [Member] | Fair Value, Inputs, Level 1 [Member] |
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Summary Of Significant Accounting Policies [Line Items] |
|
|
|
Derivative Liabilities |
|
0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = watt_FinancingWarrantMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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Financing Warrant [Member] | Fair Value, Inputs, Level 2 [Member] |
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|
Summary Of Significant Accounting Policies [Line Items] |
|
|
|
Derivative Liabilities |
|
0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = watt_FinancingWarrantMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Financing Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |
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|
Summary Of Significant Accounting Policies [Line Items] |
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|
|
Derivative Liabilities |
|
175,000us-gaap_DerivativeLiabilitiesCurrent / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = watt_FinancingWarrantMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
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Consulting Warrant [Member] |
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Summary Of Significant Accounting Policies [Line Items] |
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Derivative Liabilities |
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529,000us-gaap_DerivativeLiabilitiesCurrent / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = watt_ConsultingWarrantMember
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4,019,000us-gaap_DerivativeLiabilitiesCurrent / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = watt_ConsultingWarrantMember
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Consulting Warrant [Member] | Fair Value, Inputs, Level 1 [Member] |
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|
|
Summary Of Significant Accounting Policies [Line Items] |
|
|
|
Derivative Liabilities |
|
0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = watt_ConsultingWarrantMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
|
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Consulting Warrant [Member] | Fair Value, Inputs, Level 2 [Member] |
|
|
|
Summary Of Significant Accounting Policies [Line Items] |
|
|
|
Derivative Liabilities |
|
0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = watt_ConsultingWarrantMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
|
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Consulting Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |
|
|
|
Summary Of Significant Accounting Policies [Line Items] |
|
|
|
Derivative Liabilities |
|
$ 529,000us-gaap_DerivativeLiabilitiesCurrent / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = watt_ConsultingWarrantMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
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