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Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Aug. 06, 2026
Document And Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Current Fiscal Year End Date --12-31  
Document Transition Report false  
Entity Registrant Name Corvus Pharmaceuticals, Inc.  
Entity Incorporation, State or Country Code DE  
Securities Act File Number 001-37719  
Entity Tax Identification Number 46-4670809  
Entity Address, Address Line One 901 Gateway Boulevard, Third Floor  
Entity Address, City or Town South San Francisco  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94080  
City Area Code 650  
Local Phone Number 900-4520  
Title of 12(b) Security Common Stock, Par Value $0.0001 per share  
Trading Symbol CRVS  
Security Exchange Name NASDAQ  
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  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   84,120,944
Entity Central Index Key 0001626971  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false