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4. CONVERTIBLE NOTES PAYABLE AND FAIR VALUE MEASUREMENTS (Details 2) (USD $)	6 Months Ended
	Jun. 30, 2012
Convertible Notes Payable And Fair Value Measurements Details 2
Balance Dec 31, 2011	$ 647,977
Change in Fair Value	218,235
Balance Mar 31, 2012	866,212
Change in Fair Value	(524,575)
Balance June 30, 2012	$ 341,637

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- Definition

Change in fair value derivative liability

+ References

No definition available.

+ Details

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Namespace Prefix:	evsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Change in fair value derivative liability

+ References

No definition available.

+ Details

Name:	evsi_ChangeInFairValueDerivativeLiabilityMarchToJune
Namespace Prefix:	evsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

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Namespace Prefix:	evsi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

level 3 derivative liability

+ References

No definition available.

+ Details

Name:	evsi_Level3DerivativeLiability
Namespace Prefix:	evsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

level 3 derivative liability middle period

+ References

No definition available.

+ Details

Name:	evsi_Level3DerivativeLiabilityMiddlePeriod
Namespace Prefix:	evsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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