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1. NATURE OF OPERATIONS, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Customer A
Concentration of Accounts Receivable	46.00%	0.00%
Concentration of Revenues	26.00%	26.00%
Customer B
Concentration of Accounts Receivable	31.00%	0.00%
Concentration of Revenues	24.00%	0.00%
Customer C
Concentration of Accounts Receivable	18.00%	0.00%
Concentration of Revenues	22.00%	0.00%
Customer D
Concentration of Accounts Receivable	0.00%	57.00%
Concentration of Revenues	13.00%	41.00%
Customer E
Concentration of Accounts Receivable	0.00%	40.00%
Concentration of Revenues	0.00%	13.00%
Customer F
Concentration of Revenues	0.00%	10.00%

X

- Definition

Concentration of Accounts Receivable

+ References

No definition available.

+ Details

Name:	evsi_EntityWideAccountsRecieivableMajorCustomerPercentage1
Namespace Prefix:	evsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration