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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