Debt Early Termination Fee

No definition available.

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Period Type:	duration

- Definition

Debt Instrument, Covenant Compliance, Minimum Unrestricted Cash Requirement

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Covenant Compliance, Minimum Unrestricted Cash Threshold for Additional Covenants

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

LIBOR Rate Period One

+ References

No definition available.

+ Details

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- Definition

LIBOR Rate Period Three

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

LIBOR Rate Period Two

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Line of Credit, Accordion Feature

+ References

No definition available.

+ Details

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Namespace Prefix:	evlv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long-term Debt, Imputed Interest Rate

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum amount of mandatory debt prepayment

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mandatory debt prepayment expressed as a percentage of excess cash flow

+ References

No definition available.

+ Details

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

- Definition

Unrestricted Cash Plus Credit Facility Availability

+ References

No definition available.

+ Details

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

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(8))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
-SubTopic 10
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-Subparagraph (SX 210.5-02(22))
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+ Details

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- Definition

Amount of assets pledged to secure a debt instrument.

+ References

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
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Period Type:	instant

- Definition

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

+ References

+ Details

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- 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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

+ Details

Name:	us-gaap_DeferredFinanceCostsGross
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 50
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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for financing purchases of goods acquired for inventory or imminent delivery to a customer.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
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-Section S99
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

Name:	us-gaap_LongTermDebtNoncurrent
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal.

+ References

No definition available.

+ Details

Name:	us-gaap_PaymentsOfDebtExtinguishmentCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=evlv_TermLoanMember
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Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=evlv_AlternateBaseRateDomain
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Data Type:	na
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Period Type:

- Details

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Credit Agreements (Details) - USD ($)		1 Months Ended	3 Months Ended		12 Months Ended
Credit Agreements (Details) - USD ($)	Mar. 21, 2017	Apr. 30, 2016	Apr. 29, 2017	Apr. 30, 2016	Jan. 28, 2017	Mar. 10, 2016	Oct. 08, 2015
Debt Instrument [Line Items]
Long-term debt, gross of unamortized issuance costs			$ 82,565,000
Long-term debt			81,894,000		$ 85,388,000
Long-term credit facilities, current maturities			3,440,000		3,242,000
Long-term credit facilities, excluding current portion			78,454,000		$ 82,146,000
Principal prepayments of GACP Term Loan			10,263,000	$ 607,000
Loss on extinguishment of debt			(913,000)	0
Early termination and lender fees included in loss on extinguishment of debt			199,000	0
Unamortized debt issuance costs included in loss on extinguishment of debt			127,000	112,000
PNC Bank, N.A. [Member]
Debt Instrument [Line Items]
Revolving line of credit facility, maximum borrowing capacity			90,000,000
Revolving line of credit, accordion feature			25,000,000
Proceeds from PNC Credit Facility	$ 6,000,000
Debt Instrument, Maturity Date	Mar. 21, 2022				May 01, 2020
Revolving line of credit facility, capacity available for the issuance of letters of credit			$ 6,000,000
Debt instrument term			5 years
Imputed effective interest rate			7.40%
Interest expense			$ 1,062,000	857,000
Debt instrument covenant compliance, minimum unrestricted cash plus facility requirement			10,000,000
Additional cash required to be restricted under PNC Credit Facility covenants			$ 0
Financial covenant, minimum fixed charge coverage ratio			1.1 to 1.0
Minimum unrestricted cash plus facility available threshold for additional covenants			$ 18,000,000
Unrestricted cash plus credit facility available			38,000,000
Debt issuance costs, gross of amortization			1,365,000
PNC Bank, N.A. [Member] \| Original 2012 Line Of Credit Agreement [Member]
Debt Instrument [Line Items]
Debt issuance costs, gross of amortization			466,000
PNC Bank, N.A. [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Revolving loan			59,900,000		$ 59,900,000
Remaining borrowing capacity			12,100,000
PNC Bank, N.A. [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt, gross of unamortized issuance costs			16,086,000		10,637,000
Less unamortized debt issuance costs			(189,000)		(181,000)
Long-term debt			15,897,000		10,456,000		$ 15,000,000
Long-term credit facilities, current maturities			2,500,000
First security interest maximum			$ 19,000,000
Debt instrument term			84 months
Mandatory prepayment percentage of excess cash flow			50.00%
Mandatory prepayment maximum amount			$ 2,000,000
PNC Bank, N.A. [Member] \| Year One [Member]
Debt Instrument [Line Items]
Debt early termination fee, percentage			3.00%
PNC Bank, N.A. [Member] \| Year Two [Member]
Debt Instrument [Line Items]
Debt early termination fee, percentage			1.00%
PNC Bank, N.A. [Member] \| Year Three [Member]
Debt Instrument [Line Items]
Debt early termination fee, percentage			0.50%
PNC Bank, N.A. [Member] \| After Year Three [Member]
Debt Instrument [Line Items]
Debt early termination fee, percentage			0.00%
GACP [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date			Mar. 09, 2021
Debt instrument term			5 years
Mandatory prepayment percentage of excess cash flow			50.00%
Imputed effective interest rate			15.30%
Interest expense			$ 429,000	$ 342,000
Debt instrument covenant compliance, minimum unrestricted cash plus facility requirement			$ 10,000,000
Financial covenant, minimum fixed charge coverage ratio			1.1 to 1.0
Minimum unrestricted cash plus facility available threshold for additional covenants			$ 18,000,000
Debt issuance costs, gross of amortization			1,556,000
GACP [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt, gross of unamortized issuance costs			6,579,000		16,292,000
Less unamortized debt issuance costs			(482,000)		(1,260,000)
Long-term debt			$ 6,097,000		$ 15,032,000	$ 17,000,000
Principal prepayments of GACP Term Loan	$ 9,500,000
Loss on extinguishment of debt	913,000
Early termination and lender fees included in loss on extinguishment of debt	199,000
Unamortized debt issuance costs included in loss on extinguishment of debt	$ 714,000
Monthly installment amount, Repayments of principal		$ 70,833
GACP [Member] \| Alternate Base Rate [Domain]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			10.00%
GACP [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
LIBOR Rate Period One			1 month
LIBOR Rate Period Two			2 months
LIBOR Rate Period Three			3 months
GACP [Member] \| Interest Rate Floor [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.00%
GACP [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			11.00%
GACP [Member] \| Year Two [Member]
Debt Instrument [Line Items]
Debt early termination fee, percentage			2.00%
GACP [Member] \| Year Three [Member]
Debt Instrument [Line Items]
Debt early termination fee, percentage			1.00%
GACP [Member] \| After Year Three [Member]
Debt Instrument [Line Items]
Debt early termination fee, percentage			0.00%
Minimum [Member] \| PNC Bank, N.A. [Member] \| LIBOR [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			3.00%
Minimum [Member] \| PNC Bank, N.A. [Member] \| LIBOR [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			5.00%
Minimum [Member] \| PNC Bank, N.A. [Member] \| Base Rate [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			4.00%
Maximum [Member] \| PNC Bank, N.A. [Member] \| LIBOR [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			4.50%
Maximum [Member] \| PNC Bank, N.A. [Member] \| LIBOR [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			6.00%
Maximum [Member] \| PNC Bank, N.A. [Member] \| Base Rate [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			5.00%