v3.5.0.2
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2016
Oct. 31, 2016
Document and Entity Information    
Entity Registrant Name CATABASIS PHARMACEUTICALS INC  
Entity Central Index Key 0001454789  
Document Type 10-Q  
Document Period End Date Sep. 30, 2016  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   18,652,303
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q3