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9. CONVERTIBLE NOTE PAYABLE - RELATED PARTIES AND FAIR VALUE MEASUREMENTS (Details-Summary) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Convertible Notes Payable - Related Parties	$ 724,616	$ 686,616
Convertible Notes Payable [Member] | Evey Note [Member]
Convertible Notes Payable - Related Parties	74,616	86,616
Convertible Notes Payable [Member] | Wheatley Note [Member]
Convertible Notes Payable - Related Parties	50,000	0
Convertible Notes Payable [Member] | Gemini Master Fund - Third Amended [Member]
Convertible Notes Payable - Related Parties	$ 600,000	$ 600,000

X

- 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

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

X

- Details

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

X

- Details

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