Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details 5)

v2.4.1.9
Income Taxes (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Federal income tax purposes  
Operating Loss Carryforwards  
NOL carryforwards $ 55,671us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_InternalRevenueServiceIRSMember
Alternative minimum tax credit carryforwards 875env_AlternativeMinimumTaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_InternalRevenueServiceIRSMember
Deferred Tax Assets, in Process Research and Development 534us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_InternalRevenueServiceIRSMember
State income tax purposes  
Operating Loss Carryforwards  
NOL carryforwards 36,586us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_StateAndLocalJurisdictionMember
Alternative minimum tax credit carryforwards 22env_AlternativeMinimumTaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_StateAndLocalJurisdictionMember
Deferred Tax Assets, in Process Research and Development $ 675us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_StateAndLocalJurisdictionMember