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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

X

- Definition

The amount for notes payable (written promise to pay), due to related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef
-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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CounterpartyNameAxis=evsi_WheatleyNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CounterpartyNameAxis=evsi_EveyNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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