Represents credit agreement fixed charge coverage ratio.

No definition available.

Name:	egan_DebtInstrumentCovenantConsolidatedFixedChargeCoverageRatio
Namespace Prefix:	egan_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents credit agreement leverage ratio.

+ References

No definition available.

+ Details

Name:	egan_DebtInstrumentCovenantConsolidatedLeverageRatio
Namespace Prefix:	egan_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Quarterly Payments, Thereafter

+ References

No definition available.

+ Details

Name:	egan_LineOfCreditFacilityQuarterlyPaymentsThereafter
Namespace Prefix:	egan_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the percentage by which principal amount not to exceed trailing twelve month recurring revenues from hosted, subscription and maintenance fees attributable to software, as calculated under the Credit Agreement.

+ References

No definition available.

+ Details

Name:	egan_PercentageByWhichPrincipalAmountNotToExceedCertainCriteriaAsCalculatedUnderCreditAgreement
Namespace Prefix:	egan_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of premium on voluntary repayments of the Term Loan, voluntary permanent reductions of the commitment related to the Revolving Loans and certain mandatory prepayments.

+ References

No definition available.

+ Details

Name:	egan_PrepaymentPremium
Namespace Prefix:	egan_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the required periodic payments of both interest and principal.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityPeriodicPayment
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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

+ Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=egan_CreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=egan_VariableRatesOtherThanLiborMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_FederalFundsEffectiveSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=egan_OneMonthLiborMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=egan_CreditAgreementAmendmentNumberOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Bank Borrowings - Narrative (Details)			3 Months Ended	6 Months Ended		24 Months Ended
Bank Borrowings - Narrative (Details)	Sep. 02, 2015 USD ($)	Nov. 21, 2014 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($)
Credit Agreement \| LIBOR
Bank Borrowings
Debt instrument variable rate		4.75%
Credit Agreement \| Variable Rates Other Than LIBOR
Bank Borrowings
Debt instrument variable rate		3.75%
Credit Agreement \| Federal Funds Rate
Bank Borrowings
Debt instrument variable rate basis		Federal Funds
Debt instrument variable rate		0.50%
Credit Agreement \| One Month LIBOR
Bank Borrowings
Debt instrument variable rate basis		one month LIBOR
Debt instrument variable rate		1.00%
Credit Agreement \| Prime Rate
Bank Borrowings
Debt instrument variable rate basis		prime rate
Credit Agreement \| Minimum
Bank Borrowings
Fixed charge coverage ratio		1.50
Credit Agreement \| Maximum
Bank Borrowings
Leverage ratio		2.50
Credit Agreement \| Revolving Loan
Bank Borrowings
Prepayment premium		1.00%
Credit Agreement \| Revolving Loan \| Maximum
Bank Borrowings
Revolving loan principal amount		$ 10,000,000
Credit Agreement \| Term Loan
Bank Borrowings
Prepayment premium		1.00%
Credit Agreement \| Term Loan \| Maximum
Bank Borrowings
Term loan principal amount		$ 10,000,000
Borrowing limit as a percentage of trailing 12 month recurring revenue		60.00%
Amendment Number One \| LIBOR
Bank Borrowings
Debt instrument variable rate basis	LIBOR
Debt instrument variable rate	7.00%
Amendment Number One \| Prime Rate
Bank Borrowings
Debt instrument variable rate basis	prime rate
Debt instrument variable rate	6.00%
Amendment Number One \| Revolving Loan
Bank Borrowings
Prepayment premium	1.00%
Amendment Number One \| Revolving Loan \| Minimum
Bank Borrowings
Revolving loan principal amount	$ 10,000,000
Amendment Number One \| Revolving Loan \| Maximum
Bank Borrowings
Revolving loan principal amount	$ 15,000,000
Amendment Number One \| Term Loan
Bank Borrowings
Prepayment premium	1.00%
Quarterly amortization payment					$ 187,500	$ 250,000
Quarterly amortization payment after March 31, 2018				$ 114,407
Prepayment of debt			$ 4,000,000