Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Additional Information (Details)

v3.22.1
Basis of Presentation - Additional Information (Details)
 3 Months Ended 12 Months Ended
Jan. 21, 2020
USD ($)
Debtinstrument
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Apr. 30, 2020
USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Net losses   $ 3,500,000 $ 98,921,000 $ 91,564,000    
Accumulated deficit   381,993,000     $ 378,493,000  
Cash and cash equivalents   31,361,000     $ 27,446,000  
Short-term investments   43,909,000        
Iterum Therapeutics US Limited | Silicon Valley Bank (SVB) | Paycheck Protection Program            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Aggregate principal amount           $ 744,000
Debt instrument interest rate           1.00%
2025 Exchangeable Notes            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Aggregate principal amount   $ 12,607,000        
Private Placement and Rights Offering | 2025 Exchangeable Notes            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Aggregate principal amount $ 51,808,000          
Debt instrument interest rate 6.50%          
Private Placement and Rights Offering | RLNs            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Aggregate principal amount $ 104,000          
Private Placement | 2025 Exchangeable Notes            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Aggregate principal amount 51,588,000          
Debt instrument price per unit 1,000          
Private Placement | RLNs            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Aggregate principal amount $ 103,000          
Number of debt instruments within each notes | Debtinstrument 50