Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation (Details 4)

v2.4.1.9
Stock Based Compensation (Details 4) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Share-based Compensation, Total $ 2,547,978us-gaap_ShareBasedCompensation $ 16,148us-gaap_ShareBasedCompensation
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Allocated Share-based Compensation Expense 900,063us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
IR Consulting Warrant [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Allocated Share-based Compensation Expense 263,972us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= watt_IrConsultingWarrantMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= watt_IrConsultingWarrantMember
Consultant For Services Rendered [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Allocated Share-based Compensation Expense 50,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= watt_ConsultantForServicesRenderedMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= watt_ConsultantForServicesRenderedMember
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Allocated Share-based Compensation Expense $ 1,333,943us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_EmployeeStockOptionMember
$ 16,148us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_EmployeeStockOptionMember