v3.26.1
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Jul. 31, 2026
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Entity Registrant Name Monte Rosa Therapeutics, Inc.  
Entity Central Index Key 0001826457  
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   85,313,401
Entity Shell Company false  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Title of 12(b) Security Common stock, par value $0.0001 per share  
Trading Symbol GLUE  
Security Exchange Name NASDAQ  
Securities Act File Number 001-40522  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 84-3766197  
Entity Address, Address Line One 321 Harrison Avenue  
Entity Address, Address Line Two Suite 900  
Entity Address, City or Town Boston  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 02118  
City Area Code 617  
Local Phone Number 949-2643  
Document Quarterly Report true  
Document Transition Report false