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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 28, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Registrant Name EngageSmart, Inc.    
Entity Central Index Key 0001863105    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   162,194,210  
Entity Public Float     $ 0
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity File Number 001-40835    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 83-2785225    
Entity Address, Address Line One 30 Braintree Hill Office Park    
Entity Address, Address Line Two Suite 101    
Entity Address, City or Town Braintree    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02184    
City Area Code 781    
Local Phone Number 848-3733    
Document Annual Report true    
Document Transition Report false    
Security 12b Title Common stock, $0.001 par value per share    
Trading Symbol ESMT    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
ICFR Auditor Attestation Flag false    
Documents Incorporated by Reference

Portions of the registrant’s proxy statement for the 2022 annual meeting of stockholders to be filed with the SEC within 120 days after the fiscal year ended December 31, 2021, are incorporated herein by reference in Part III of this Form 10-K.

    
Auditor Name Deloitte & Touche LLP    
Auditor Location Boston, MA, United States    
Auditor Firm ID 34