v3.25.1
Cover Page - shares
 3 Months Ended
Mar. 31, 2025
Apr. 28, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2025  
Document Transition Report false  
Entity File Number 001-33277  
Entity Registrant Name MADRIGAL PHARMACEUTICALS, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 04-3508648  
Entity Address, Address Line One Four Tower Bridge  
Entity Address, Address Line Two 200 Barr Harbor Drive, Suite 200  
Entity Address, City or Town West Conshohocken  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 19428  
City Area Code 267  
Local Phone Number 824-2827  
Title of 12(b) Security Common Stock, $0.0001 Par Value Per Share  
Trading Symbol MDGL  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   22,203,282
Amendment Flag false  
Document Fiscal Year Focus 2025  
Entity Central Index Key 0001157601  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q1