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10. CONVERTIBLE NOTE PAYABLE - RELATED PARTIES AND FAIR VALUE MEASUREMENTS (Details-Summary) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Convertible Notes Payable - Related Parties | $ 207,116 | $ 197,616 | $ 724,616
Wheatley Note [Member] |  |  |
Convertible Notes Payable - Related Parties | 147,500 |  |
Evey Note [Member] |  |  |
Convertible Notes Payable - Related Parties | 59,616 |  |
Evey Note [Member] | Convertible Notes Payable [Member] |  |  |
Convertible Notes Payable - Related Parties | 59,616 | 62,616 |
Convertible Notes Payable [Member] | Wheatley Note [Member] |  |  |
Convertible Notes Payable - Related Parties | $ 147,500 | 135,000 | 50,000
Convertible Notes Payable [Member] | Evey Note [Member] |  |  |
Convertible Notes Payable - Related Parties |  |  | 74,616
Convertible Notes Payable [Member] | Gemini Master Fund - Third Amended [Member] |  |  |
Convertible Notes Payable - Related Parties |  | $ 0 | $ 600,000

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- Definition The amount for notes payable (written promise to pay), due to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
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- Details
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Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_CounterpartyNameAxis=evsi_GeminiMasterThirdMember
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Data Type: | na
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Period Type: |