Accounts Receivable, Net - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accounts Receivable Net [Abstract]
Bad debt expense and sales credits reserve	$ 0.2	$ 0.1	$ 0.6	$ 0.1

Provision for doubtful accounts and sales credits reserve.

No definition available.

Name:	evbg_ProvisionForDoubtfulAccountsAndSalesCreditsReserve
Namespace Prefix:	evbg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration