XML 36 R24.htm IDEA: XBRL DOCUMENT
v3.20.2

Commitments and Contingencies - Operating Leases - Additional Information (Detail) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 13, 2019 | May 31, 2017 | Aug. 25, 2015 | Sep. 10, 2014 | Oct. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Jul. 15, 2019 | Jul. 01, 2019 | Jan. 01, 2019
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  | $ 1,678,983 | $ 2,057,576 |  |  |
Operating lease liabilities |  |  |  |  |  |  | 803,760 | 722,291 |  |  |
Total operating lease payments |  |  |  |  |  |  | 1,860,189 |  |  |  |
Long-term portion of operating lease liabilities |  |  |  |  |  |  | 979,660 | $ 1,402,193 |  |  |
ASU No. 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  | 1,678,983 |  |  |  | $ 414,426
Operating lease liabilities |  |  |  |  |  |  | 803,760 |  |  |  | $ 485,747
Total operating lease payments |  |  |  |  |  |  | 1,860,189 |  |  |  |
Long-term portion of operating lease liabilities |  |  |  |  |  |  | $ 979,660 |  |  |  |
Weighted average remaining lease term |  |  |  |  |  |  | 2 years 2 months 12 days |  |  |  |
San Jose, California [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating leases, rent expense |  |  |  |  | $ 52,970 |  |  |  |  |  |
Lease expiration date |  |  | Jun. 30, 2019 |  |  |  |  |  |  |  |
Operating lease, renewal term |  |  |  |  |  |  |  |  |  | 3 years |
San Jose, California [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum monthly lease payment |  |  |  |  | 64,941 |  |  |  |  |  |
Costa Mesa, California [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating leases, rent expense |  | $ 9,040 |  |  | 9,773 |  |  |  |  |  |
Lease expiration date |  | Sep. 30, 2019 |  |  |  |  |  |  |  |  |
Operating lease, renewal term |  |  |  |  |  |  |  |  | 2 years |  |
Costa Mesa, California [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum monthly lease payment |  |  |  |  | $ 10,200 |  |  |  |  |  |
Balzer Family Investments Lp [Member] | San Jose, California [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating leases expiration period |  |  |  | 60 months |  |  |  |  |  |  |
Operating leases, rent expense |  |  |  | $ 36,720 |  | $ 48,372 |  |  |  |  |
Lease expiration date | Sep. 30, 2019 |  |  |  |  |  |  |  |  |  |

X
- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseLiabilityNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
Name: | us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Commitments and contingencies. + References No definition available. + Details
Name: | watt_CommitmentsAndContingenciesLineItems
Namespace Prefix: | watt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Monthly lease payment, threshold limit. + References No definition available. + Details
Name: | watt_MonthlyLeasePaymentThresholdLimit
Namespace Prefix: | watt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Operating lease monthly rental expense. + References No definition available. + Details
Name: | watt_OperatingLeaseMonthlyRentalExpense
Namespace Prefix: | watt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the expiration period of operating leases entered into during the period. + References No definition available. + Details
Name: | watt_OperatingLeasesExpirationPeriod
Namespace Prefix: | watt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=watt_SanJoseCaliforniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=watt_CostaMesaCaliforniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=watt_BalzerFamilyInvestmentsLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |