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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 24, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2024    
Document Transition Report false    
Entity File Number 001-39522    
Entity Registrant Name COMPASS Pathways plc    
Entity Incorporation, State or Country Code X0    
Entity Address, Address Line One 33 Broadwick Street    
Entity Address, City or Town London    
Entity Address, Postal Zip Code W1F 0DQ    
Entity Address, Country GB    
City Area Code 716    
Local Phone Number 676-6461    
Title of 12(b) Security American Depositary Shares, each representing one ordinary share, par value of £0.008 per share    
Trading Symbol CMPS    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 354.8
Entity Common Stock, Shares Outstanding   92,673,132  
Documents Incorporated by Reference
Portions of the Registrant’s Proxy Statement for the 2025 Annual Meeting of Shareholders are incorporated herein by reference into Part III of this Annual Report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the Registrant’s fiscal year ending December 31, 2024.
    
Entity Central Index Key 0001816590    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false