Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
6 Months Ended
Jun. 30, 2020
Jul. 31, 2020
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q2  
Trading Symbol ITRM  
Entity Registrant Name Iterum Therapeutics plc  
Entity Central Index Key 0001659323  
Entity Current Reporting Status Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   21,239,093
Entity File Number 001-38503  
Entity Tax Identification Number 98-1283148  
Entity Address, Address Line One Block 2 Floor 3  
Entity Address, Address Line Two Harcourt Centre  
Entity Address, Address Line Three Harcourt Street  
Entity Address, City or Town Dublin 2  
Entity Address, Country IE  
City Area Code +353  
Local Phone Number 1 903-8920  
Entity Interactive Data Current Yes  
Title of 12(b) Security Ordinary Shares, $0.01 par value per share  
Security Exchange Name NASDAQ  
Entity Incorporation, State or Country Code L2  
Document Quarterly Report true  
Document Transition Report false