v3.19.3
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2019
Nov. 08, 2019
Cover [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 TTPH  
Entity Registrant Name TETRAPHASE PHARMACEUTICALS INC  
Entity Central Index Key 0001373707  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Shell Company false  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity File Number 001-35837  
Entity Tax Identification Number 20-5276217  
Entity Address, Address Line One 480 Arsenal Way  
Entity Address, City or Town Watertown  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 02472  
City Area Code 617  
Local Phone Number 715-3600  
Entity Common Stock, Shares Outstanding   3,015,824
Document Quarterly Report true  
Document Transition Report false  
Entity Incorporation, State or Country Code DE  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock, $0.001 par value  
Security Exchange Name NASDAQ