Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity Restricted Stock (Details)

v2.4.1.9
Shareholders' Equity Restricted Stock (Details) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended
Feb. 01, 2014
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Nov. 18, 2014
Jun. 18, 2014
tranche
Mar. 17, 2014
Mar. 13, 2014
Nov. 25, 2013
Nov. 26, 2013
Jun. 19, 2013
Oct. 03, 2012
tranche
Jun. 14, 2012
Nov. 17, 2014
Jun. 13, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Share-based compensation   $ 3,860,000us-gaap_ShareBasedCompensation $ 3,217,000us-gaap_ShareBasedCompensation $ 3,257,000us-gaap_ShareBasedCompensation                      
Unrecognized compensation cost related to non-vested awards   1,633,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years                          
Total grant date fair value                           1,000,000evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityIntstrumentOtherThanOptionsAggregateValue  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 3.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 3.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue   $ 1.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue                      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   1.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate                          
Restricted Stock [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Share-based compensation 812,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
1,323,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
  1,575,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
                     
Unrecognized compensation cost related to non-vested awards   2,616,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
                         
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term   2 years 0 months 25 days                          
Restricted stock vested in period, total fair value 2,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
1,136,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
  874,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
                     
Granted   392,000us-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
436,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
  44,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Number of tranches           7evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberOfTranches
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
          3evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberOfTranches
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years     3 years   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
            78.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Total grant date fair 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
2,426,000evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityIntstrumentOtherThanOptionsAggregateValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
  228,000evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityIntstrumentOtherThanOptionsAggregateValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
425,000evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityIntstrumentOtherThanOptionsAggregateValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
  1,373,000evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityIntstrumentOtherThanOptionsAggregateValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
85,000evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityIntstrumentOtherThanOptionsAggregateValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Number of non-management board members granted shares             $ 2evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfNonManagementBoardMembersGrantedShares
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
      $ 6evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfNonManagementBoardMembersGrantedShares
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
      $ 5evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfNonManagementBoardMembersGrantedShares
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Non-vested shares outstandings 641,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
704,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
641,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
                       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, 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, Fair Value Assumptions, Risk Free Interest Rate         1.03%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
            0.32%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Restricted Stock [Member] | Chief Strategy Officer [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted         79,916us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= evlv_ChiefStrategyOfficerMember
                   
Restricted Stock [Member] | Chief Executive Officer [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted         199,790us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
                   
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
 
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
 
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
 
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
 
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