v3.26.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2026
May 07, 2026
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Trading Symbol ELDN  
Entity Registrant Name ELEDON PHARMACEUTICALS, INC.  
Entity Central Index Key 0001404281  
Entity Current Reporting Status Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Shell Company false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   77,187,823
Entity File Number 001-36620  
Entity Tax Identification Number 20-1000967  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 19800 MacArthur Blvd  
Entity Address, Address Line Two Suite 250  
Entity Address, City or Town Irvine  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92612  
City Area Code (949)  
Local Phone Number 238-8090  
Document Transition Report false  
Document Quarterly Report true  
Title of 12(b) Security Common Stock, $0.001 par value  
Security Exchange Name NASDAQ  
Entity Interactive Data Current Yes