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Geographic Area Data (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Revenue    $ 426,000us-gaap_Revenues
United States [Member]    
Revenue    87,000us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= ENVS_UnitedStatesMember
China [Member]    
Revenue    324,000us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= ENVS_ChinaMember
United Kingdom [Member]    
Revenue    8,000us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= ENVS_UnitedKingdomMember
Korea [Member]    
Revenue    7,000us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= ENVS_KoreaMember
Japan [Member]    
Revenue