Share based compensation threshold consecutive trading days.

No definition available.

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Namespace Prefix:	evbg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Share based compensation vesting stock price trigger to achieve vesting of performance based restricted stock units.

+ References

No definition available.

+ Details

Name:	evbg_ShareBasedCompensationVestingStockPriceTrigger
Namespace Prefix:	evbg_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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

- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

+ Details

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

- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

+ Details

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

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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

- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

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

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

- Details

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

- Details

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

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix:
Data Type:	na
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Subsequent Events - Additional Information (Details) $ / shares in Units, $ in Millions	1 Months Ended	6 Months Ended	12 Months Ended
	Jul. 31, 2017 USD ($) Day $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2016 $ / shares shares
Subsequent Event [Line Items]
Stock option granted during period \| shares		284,470	292,204
Share based compensation arrangements by share based payment options grants in period, weighted average exercise price \| $ / shares		$ 19.73	$ 14.75
Total unrecognized compensation cost \| $		$ 8.0
Stock Options
Subsequent Event [Line Items]
Total compensation cost related to stock options/unit not yet recognized, weighted average period for recognition		2 years 5 months 27 days
Subsequent Event \| Stock Options
Subsequent Event [Line Items]
Stock option granted during period \| shares	659,700
Share based compensation arrangements by share based payment options grants in period, weighted average exercise price \| $ / shares	$ 23.60
Total unrecognized compensation cost \| $	$ 8.9
Total compensation cost related to stock options/unit not yet recognized, weighted average period for recognition	3 years 10 months 25 days
Subsequent Event \| Stock Options \| Minimum
Subsequent Event [Line Items]
Award vesting period	2 years
Subsequent Event \| Stock Options \| Maximum
Subsequent Event [Line Items]
Award vesting period	4 years
Subsequent Event \| Restricted Stock Unit
Subsequent Event [Line Items]
Award vesting period	3 years
Total compensation cost related to stock options/unit not yet recognized, weighted average period for recognition	3 years
Share-based compensation arrangement to employees, number of stock unit grants in period \| shares	278,500
Total unrecognized compensation cost \| $	$ 6.6
Subsequent Event \| Performance Based Restricted Stock Units
Subsequent Event [Line Items]
Total compensation cost related to stock options/unit not yet recognized, weighted average period for recognition	1 year 3 months 19 days
Share-based compensation arrangement to employees, number of stock unit grants in period \| shares	278,500
Total unrecognized compensation cost \| $	$ 7.6
Share Based compensation threshold consecutive trading days \| Day	30
Subsequent Event \| Performance Based Restricted Stock Units \| Minimum
Subsequent Event [Line Items]
Share-based compensation, vesting stock price trigger \| $ / shares	$ 35
Subsequent Event \| Performance Based Restricted Stock Units \| Maximum
Subsequent Event [Line Items]
Share-based compensation, vesting stock price trigger \| $ / shares	$ 55