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10. CONVERTIBLE NOTES PAYABLE AND FAIR VALUE MEASUREMENTS (Details-Summary) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Convertible Notes Payable, gross	$ 956,325us-gaap_ConvertibleNotesPayable	$ 1,506,326us-gaap_ConvertibleNotesPayable
Discount	252,070us-gaap_DebtInstrumentUnamortizedDiscount	0us-gaap_DebtInstrumentUnamortizedDiscount
Convertible Notes Payable, net of discount	704,255us-gaap_ConvertibleNotesPayableCurrent	1,506,326us-gaap_ConvertibleNotesPayableCurrent
Convertible Notes Payable [Member] | Pegasus Note [Member]
Convertible Notes Payable, gross	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
Discount	0us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_PegasusNoteMember	0us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_PegasusNoteMember
Convertible Notes Payable, net of discount	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
Convertible Notes Payable [Member] | Gemini Master Fund - Third Amended [Member]
Convertible Notes Payable, gross	856,325us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_GeminiMasterThirdMember
Discount	252,070us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_GeminiMasterThirdMember
Convertible Notes Payable, net of discount	604,255us-gaap_ConvertibleNotesPayableCurrent / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_GeminiMasterThirdMember
Convertible Notes Payable [Member] | Gemini Master Fund - Second Amended Note and Note Five [Member]
Convertible Notes Payable, gross		1,313,877us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_GeminiSecondAmendedNoteandNoteFiveMember
Discount		0us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_GeminiSecondAmendedNoteandNoteFiveMember
Convertible Notes Payable, net of discount		1,313,877us-gaap_ConvertibleNotesPayableCurrent / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_GeminiSecondAmendedNoteandNoteFiveMember
Convertible Notes Payable [Member] | Gemini Master Fund - Note 2010-3 [Member]
Convertible Notes Payable, gross		92,449us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_GeminiNote20103Member
Discount		0us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_GeminiNote20103Member
Convertible Notes Payable, net of discount		$ 92,449us-gaap_ConvertibleNotesPayableCurrent / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_ShortTermDebtTypeAxis = evsi_GeminiNote20103Member

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

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Balance Type:	credit
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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

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X

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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