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10. CONVERTIBLE NOTE PAYABLE - RELATED PARTIES AND FAIR VALUE MEASUREMENTS (Details-Summary) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Convertible Notes Payable - Related Parties | $ 160,000 | $ 197,616 | $ 724,616
Gemini Master Fund - Third Amended [Member] | Convertible Notes Payable [Member] |  |  |
Convertible Notes Payable - Related Parties |  | 0 | 600,000
Wheatley Note [Member] |  |  |
Convertible Notes Payable - Related Parties | $ 160,000 |  |
Wheatley Note [Member] | Convertible Notes Payable [Member] |  |  |
Convertible Notes Payable - Related Parties |  | 135,000 | 50,000
Evey Note [Member] | Convertible Notes Payable [Member] |  |  |
Convertible Notes Payable - Related Parties |  | $ 62,616 |
Evey Note [Member] | Convertible Notes Payable [Member] |  |  |
Convertible Notes Payable - Related Parties |  |  | $ 74,616

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- Definition The amount for notes payable (written promise to pay), due to related parties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=evsi_WheatleyNoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_ConvertibleNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |