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Restricted Stock Non-Vested Restricted Stock Table (Details) (USD $)
0 Months Ended 3 Months Ended
Nov. 18, 2014
Jun. 18, 2014
tranche
Mar. 17, 2014
Mar. 13, 2014
Jun. 19, 2013
May 02, 2015
May 03, 2014
May 02, 2015
Mar. 20, 2015
Nov. 17, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation           $ 609,000us-gaap_ShareBasedCompensation $ 1,044,000us-gaap_ShareBasedCompensation      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]                    
Award Vesting Period           3 years        
Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation           348,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
300,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]                    
Non-vested shares outstanding, beginning of period           704,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Granted   56,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
4,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
53,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
  175,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Award Vesting Period 3 years       12 months          
Vested           15,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Forfeited           (43,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Non-vested shares outstanding, end of period           821,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Number of Tranches   7evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberOfTranches
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
               
Share Based Compensation Arrangement by Share Based Payment Award Equity Intstrument Other than Options Aggregate Value   281,000evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityIntstrumentOtherThanOptionsAggregateValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
23,500evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityIntstrumentOtherThanOptionsAggregateValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
290,000evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityIntstrumentOtherThanOptionsAggregateValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
        417,593evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityIntstrumentOtherThanOptionsAggregateValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
1,373,000evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityIntstrumentOtherThanOptionsAggregateValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Share-based Compensation Arrangement by Share based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                    
Non-vested outstanding, Weighted Average Grant Date Fair Value, Beginning of Year           $ 4.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
  $ 4.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Granted, Weighted Average Grant Date Fair Value           $ 6.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Vested, Weighted Average Grant Date Fair Value           $ 5.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Forfeited, Weighted Average Grant Date Fair Value           $ 5.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Fiscal 2015 - Restricted Stock - Time Based [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]                    
Granted           67,786us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= evlv_Fiscal2015RestrictedStockTimeBasedMember
       
Fiscal 2015 - Restricted Stock - Total Shareholder Return [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]                    
Granted           106,963us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= evlv_Fiscal2015RestrictedStockTotalShareholderReturnMember
       
Share Based Compensation Arrangement by Share Based Payment Award Equity Intstrument Other than Options Aggregate Value           $ 776,865evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityIntstrumentOtherThanOptionsAggregateValue
/ us-gaap_AwardTypeAxis
= evlv_Fiscal2015RestrictedStockTotalShareholderReturnMember