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Restricted Stock Market Based Restricted Stock (Details) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended
May 02, 2015
May 03, 2014
Jan. 31, 2015
Nov. 18, 2014
Jun. 18, 2014
tranche
Mar. 17, 2014
Mar. 13, 2014
Jun. 19, 2013
Oct. 03, 2012
Mar. 20, 2015
Nov. 17, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years                    
Granted, weighted average grant date fair value $ 4.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 4.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue                  
Expected Term 6 years   5 years                
Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of tranches         7evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberOfTranches
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		            
Risk Free Interest Rate       1.03%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years       12 months      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate       60.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		              
Granted, weighted average grant date fair value       $ 4.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 175,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		       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		        
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, Number 821,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		   704,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		                
Fiscal 2015 - Restricted Stock - Total Shareholder Return [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Risk Free Interest Rate 0.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= evlv_Fiscal2015RestrictedStockTotalShareholderReturnMember		                    
Granted, weighted average grant date fair value $ 7.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= evlv_Fiscal2015RestrictedStockTotalShareholderReturnMember		                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 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		                    
Tranche 1 [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted, weighted average grant date fair value                 $ 0.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= evlv_Tranche1Member		    
Expected Term                 15 months    
Tranche 2 [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted, weighted average grant date fair value                 $ 0.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= evlv_Tranche2Member		    
Expected Term                 20 months    
Tranche 3 [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted, weighted average grant date fair value                 $ 0.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= evlv_Tranche3Member		    
Expected Term                 24 months    
Less than 33% [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted Stock, Vesting Criteria, Total Shareholder Return 0.00%evlv_RestrictedStockVestingCriteriaTotalShareholderReturn
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= evlv_Lessthan33Member		                    
Below 25 Percent [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted Stock, Vesting Criteria, Cumulative Total Shareholder Return                     0.00%evlv_RestrictedStockVestingCriteriaCumulativeTotalShareholderReturn
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= evlv_Below25PercentMember
25% - 32% [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted Stock, Vesting Criteria, Cumulative Total Shareholder Return                     25.00%evlv_RestrictedStockVestingCriteriaCumulativeTotalShareholderReturn
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= evlv_A2532Member
33% - 39% [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted Stock, Vesting Criteria, Cumulative Total Shareholder Return                     50.00%evlv_RestrictedStockVestingCriteriaCumulativeTotalShareholderReturn
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= evlv_A3339Member
40% - 49% [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted Stock, Vesting Criteria, Cumulative Total Shareholder Return                     75.00%evlv_RestrictedStockVestingCriteriaCumulativeTotalShareholderReturn
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= evlv_A4049Member
50% or Above [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted Stock, Vesting Criteria, Cumulative Total Shareholder Return                     100.00%evlv_RestrictedStockVestingCriteriaCumulativeTotalShareholderReturn
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= evlv_A50orAboveMember
Greater than 33% [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted Stock, Vesting Criteria, Total Shareholder Return 50.00%evlv_RestrictedStockVestingCriteriaTotalShareholderReturn
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= evlv_Greaterthan33Member		                    
Greater than 50% [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted Stock, Vesting Criteria, Total Shareholder Return 100.00%evlv_RestrictedStockVestingCriteriaTotalShareholderReturn
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= evlv_Greaterthan50Member		                    
Greater than 100% [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted Stock, Vesting Criteria, Total Shareholder Return 150.00%evlv_RestrictedStockVestingCriteriaTotalShareholderReturn
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= evlv_Greaterthan100Member		                    
Chief Executive Officer [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       199,790us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		              
Chief Strategy Officer [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       79,916us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= evlv_ChiefStrategyOfficerMember		              
Minimum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years                    
Minimum [Member] | Fiscal 2015 - Restricted Stock - Total Shareholder Return [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 54.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= evlv_Fiscal2015RestrictedStockTotalShareholderReturnMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                    
Maximum [Member] | Fiscal 2015 - Restricted Stock - Total Shareholder Return [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 55.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= evlv_Fiscal2015RestrictedStockTotalShareholderReturnMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember