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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Mar. 26, 2020
Jun. 30, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol ECOR    
Entity Registrant Name electroCore, Inc.    
Entity Central Index Key 0001560258    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period true    
Entity Shell Company false    
Entity Common Stock Shares Outstanding   29,959,565  
Entity Public Float     $ 45,501,518
Entity File Number 001-38538    
Entity Tax Identification Number 20-3454976    
Entity Address, Address Line One 150 Allen Road    
Entity Address, Address Line Two Suite 201    
Entity Address, City or Town Basking Ridge    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 07920    
City Area Code 973    
Local Phone Number 290-0097    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock, Par Value $0.001 Per Share    
Security Exchange Name NASDAQ    
Entity Incorporation, State or Country Code DE    
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference

Portions of the Registrant’s Definitive Proxy Statement relating to the 2020 Annual Meeting of Stockholders, which will be filed with the Securities Exchange Commission within 120 days after the end of the Registrant’s fiscal year ended December 31, 2019, are incorporated by reference into Part III of this Report.