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10. CONVERTIBLE NOTES PAYABLE AND FAIR VALUE MEASUREMENTS (Details Narrative) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Convertible notes payable	$ 956,325us-gaap_ConvertibleNotesPayable	$ 1,506,326us-gaap_ConvertibleNotesPayable
Convertible notes payable, net	704,255us-gaap_ConvertibleNotesPayableCurrent	1,506,326us-gaap_ConvertibleNotesPayableCurrent
Convertible Notes Payable [Member] | Pegasus Note [Member]
Convertible notes payable	100,000us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_PegasusNoteMember	100,000us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_PegasusNoteMember
Convertible notes payable, net	100,000us-gaap_ConvertibleNotesPayableCurrent / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_PegasusNoteMember	100,000us-gaap_ConvertibleNotesPayableCurrent / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_PegasusNoteMember
Accrued and unpaid interest	50,356us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_PegasusNoteMember
Convertible Notes Payable [Member] | Gemini Master Fund - Third Amended [Member]
Convertible notes payable	856,325us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_GeminiMasterThirdMember
Convertible notes payable, net	604,255us-gaap_ConvertibleNotesPayableCurrent / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_GeminiMasterThirdMember
Accrued and unpaid interest	$ 88,898us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_GeminiMasterThirdMember

X

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

+ Details

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

X

- Definition

Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

X

- Definition

Amount of interest payable on debt, including, but not limited to, trade payables.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.15(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph a

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9

+ Details

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

X

- Details

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