Restricted Stock, Vesting Criteria, Total Shareholder Return

No definition available.

Name:	evlv_RestrictedStockVestingCriteriaTotalShareholderReturn
Namespace Prefix:	evlv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercise Price Range, Lower Range Limit

+ References

No definition available.

+ Details

Name:	evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisePriceRangeLowerRangeLimit
Namespace Prefix:	evlv_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Number of Consecutive Trading Days

+ References

No definition available.

+ Details

Name:	evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberOfConsecutiveTradingDays
Namespace Prefix:	evlv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Share Based Compensation Arrangement by Share Based Payment Award Equity Intstrument Other than Options Aggregate Value

+ References

No definition available.

+ Details

Name:	evlv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityIntstrumentOtherThanOptionsAggregateValue
Namespace Prefix:	evlv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of vesting of share-based compensation awards.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=evlv_RestrictedStockTotalShareholderReturnMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=evlv_MarketBasedStockRestrictedStockAwardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=evlv_Lessthan33Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=evlv_Greaterthan33Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=evlv_Greaterthan50Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=evlv_Greaterthan100Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Shareholders' Equity Stockholders' Equity - Market Based Restricted Stock (Details) - USD ($)		3 Months Ended			9 Months Ended
	Aug. 18, 2016	Oct. 29, 2016	Apr. 30, 2016	May 02, 2015	Oct. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares					1,516,000
Aggregate market value of the restricted stock at the date of the award	$ 1,800,000
Granted, weighted average grant date fair value per share					$ 1.50
Restricted Stock - Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares		231,799	179,156	106,963
Aggregate market value of the restricted stock at the date of the award		$ 422,000	$ 223,571	$ 776,865	$ 422,000
Granted, weighted average grant date fair value per share		$ 1.82		$ 7.26
Award Vesting Period		3 years	3 years	3 years
Fair Value Assumptions and Methodology [Abstract]
Weighted average risk-free interest rate		0.76%		0.90%
Implied volatility rate		77.00%
Market Based Stock Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	625,000
Aggregate market value of the restricted stock at the date of the award	$ 958,000
Fair Value Assumptions and Methodology [Abstract]
Weighted average risk-free interest rate	1.50%
Implied volatility rate	86.00%
Derived Service Period	1 year 2 months 12 days
Tranche 1 (immediate) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, Percentage	33.30%
Granted, weighted average grant date fair value per share	$ 1.60
Fair Value Assumptions and Methodology [Abstract]
Derived Service Period	0 years
Tranche 2 ($4.00/share) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, Percentage	33.30%
Continuous employment requisite period	1 year
Number of consecutive trading days	20 days
Average closing price for 20 consecutive trading days, Lower range limit for vesting	$ 4.00
Vesting expiration period from date of grant	10 years
Granted, weighted average grant date fair value per share	$ 1.52
Fair Value Assumptions and Methodology [Abstract]
Derived Service Period	1 year 5 months 15 days
Tranche 3 ($6.00/share) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, Percentage	33.30%
Continuous employment requisite period	2 years
Number of consecutive trading days	20 days
Average closing price for 20 consecutive trading days, Lower range limit for vesting	$ 6.00
Vesting expiration period from date of grant	10 years
Granted, weighted average grant date fair value per share	$ 1.48
Fair Value Assumptions and Methodology [Abstract]
Derived Service Period	2 years 2 months 19 days
Less than 33% [Member] \| Restricted Stock - Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock, Vesting Criteria, Total Shareholder Return		0.00%	0.00%	0.00%
Greater than 33% [Member] \| Restricted Stock - Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock, Vesting Criteria, Total Shareholder Return		50.00%	50.00%	50.00%
Greater than 50% [Member] \| Restricted Stock - Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock, Vesting Criteria, Total Shareholder Return		100.00%	100.00%	100.00%
Greater than 100% [Member] \| Restricted Stock - Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock, Vesting Criteria, Total Shareholder Return		150.00%	150.00%	150.00%
Minimum [Member] \| Restricted Stock - Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, weighted average grant date fair value per share			$ 0.98
Fair Value Assumptions and Methodology [Abstract]
Weighted average risk-free interest rate			0.90%
Implied volatility rate			71.00%	54.00%
Maximum [Member] \| Restricted Stock - Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, weighted average grant date fair value per share			$ 1.72
Fair Value Assumptions and Methodology [Abstract]
Weighted average risk-free interest rate			1.00%
Implied volatility rate			73.00%	55.00%