Document and Entity Information - shares
6 Months Ended
Jun. 30, 2018
Aug. 02, 2018
Document And Entity Information    
Entity Registrant Name Corvus Pharmaceuticals, Inc.  
Entity Central Index Key 0001626971  
Document Type 10-Q  
Document Period End Date Jun. 30, 2018  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   29,197,857
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2