Accounts Receivable, Net - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]
Credit loss expense	$ 2,877	$ 971	$ 58
Receivable and Contract Assets
Accounts Notes And Loans Receivable [Line Items]
Credit loss expense	$ 2,700	$ 700	$ 100
ASU 2016-13
Accounts Notes And Loans Receivable [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Extensible List]	evbg:AccountingStandardsUpdates201613RetrospectiveMember