Shareholders' Equity Narrative (Details) (USD $)
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3 Months Ended |
12 Months Ended |
0 Months Ended |
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Feb. 01, 2014
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Jan. 31, 2015
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Feb. 01, 2014
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Feb. 02, 2013
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Oct. 03, 2012
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Nov. 18, 2014
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Mar. 13, 2014
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Nov. 26, 2013
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Jun. 19, 2013
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Feb. 25, 2009
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Common stock, shares authorized |
100,000,000us-gaap_CommonStockSharesAuthorized
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100,000,000us-gaap_CommonStockSharesAuthorized
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100,000,000us-gaap_CommonStockSharesAuthorized
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Common stock, shares issued |
49,844,253us-gaap_CommonStockSharesIssued
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56,448,663us-gaap_CommonStockSharesIssued
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49,844,253us-gaap_CommonStockSharesIssued
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Debt Conversion, Converted Instrument, Warrants or Options Issued |
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5,058,741us-gaap_DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1
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Class of Warrant or Right, Outstanding |
6,000,000us-gaap_ClassOfWarrantOrRightOutstanding
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6,000,000us-gaap_ClassOfWarrantOrRightOutstanding
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Allocated Share-based Compensation Expense |
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$ 2,537,000us-gaap_AllocatedShareBasedCompensationExpense
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$ 2,405,000us-gaap_AllocatedShareBasedCompensationExpense
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$ 1,682,000us-gaap_AllocatedShareBasedCompensationExpense
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Number of Omnibus Stock Plans |
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1evlv_NumberOfOmnibusStockPlans
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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |
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3 years
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Granted, weighted average grant date fair value |
$ 3.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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$ 3.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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$ 1.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value |
469,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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6,099,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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146,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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Unrecognized compensation cost related to non-vested awards |
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1,633,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
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Period for recognition of unrecognized compensation cost |
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1 year 11 months 26 days
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Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options |
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1,129,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
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174,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
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52,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
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Minimum [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Purchase price of common stock, percent |
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100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_RangeAxis = us-gaap_MinimumMember
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Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |
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10 years
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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |
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3 years
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2011 Omnibus Incentive Plan [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Number of shares authorized |
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6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = evlv_A2011OmnibusIncentivePlanMember
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Granted, weighted average grant date fair value |
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$ 4.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = evlv_A2011OmnibusIncentivePlanMember
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Market Based Stock Options Awards [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Granted, weighted average grant date fair value |
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$ 4.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = evlv_MarketBasedStockOptionsAwardsMember
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2004 Omnibus Incentive Stock Plan [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Granted, weighted average grant date fair value |
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$ 5.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = evlv_A2004OmnibusIncentiveStockPlanMember
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GE [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Class of Warrant or Right, Outstanding |
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0us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = evlv_GeMember
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Class of Warrant or Right, Exercise Price of Warrants or Rights |
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$ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = evlv_GeMember
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Restricted Stock [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |
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3 years
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3 years
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3 years
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12 months
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Granted, weighted average grant date fair value |
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$ 4.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
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Unrecognized compensation cost related to non-vested awards |
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$ 2,616,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
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Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |
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2 years 0 months 25 days
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