Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
9 Months Ended
Sep. 30, 2019
Oct. 21, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Trading Symbol CNAT  
Entity Registrant Name Conatus Pharmaceuticals Inc.  
Entity Central Index Key 0001383701  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Shell Company false  
Entity Small Business true  
Entity Emerging Growth Company false  
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Security Exchange Name NASDAQ  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 16745 W. Bernardo Dr.  
Entity Address, Address Line Two Suite 200  
Entity Address, City or Town San Diego  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92127  
City Area Code (858)  
Local Phone Number 376-2600  
Entity File Number 001-36003  
Entity Tax Identification Number 20-3183915  
Entity Common Stock, Shares Outstanding   33,170,487
Document Quarterly Report true  
Document Transition Report false