Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Details)

v3.23.3
Debt - Additional Information (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 32 Months Ended
Jun. 05, 2023
USD ($)
$ / shares
shares
Sep. 08, 2020
USD ($)
Debtinstrument
$ / shares
Apr. 30, 2020
USD ($)
Jan. 21, 2020
USD ($)
Debtinstrument
shares
Apr. 27, 2018
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
Nov. 30, 2020
USD ($)
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2023
USD ($)
$ / shares
shares
Mar. 01, 2022
Debt Instrument [Line Items]                            
Accretion of debt discounts and deferred financing costs                   $ 1,753,000 $ 1,748,000      
Ordinary Shares                            
Debt Instrument [Line Items]                            
Number of warrants to purchase preferred shares | shares         1,326     1,326   1,326     1,326  
Loan and Security Agreement | Silicon Valley Bank (SVB)                            
Debt Instrument [Line Items]                            
Loan and security agreement entered date                   Apr. 27, 2018        
Funded amount under agreement         $ 15,000,000                  
Remaining borrowing facility available date         Oct. 31, 2019                  
Maximum amount available under agreement         $ 30,000,000                  
Date of first required payment of initial draw         Nov. 01, 2019                  
Minimum fixed interest rate per annum         8.31%                  
Final interest rate payment on outstanding principal         4.20%                  
Principal and interest payment, maturity date         Mar. 01, 2022                  
Final payment fee         $ 630,000                  
Principal payment during the period                   $ 1,552,000        
Effective annual interest rate on outstanding debt                           12.51%
Interest expense               $ 0 $ 0 $ 0 16,000      
Accretion of debt discounts and deferred financing costs                 0   6,000      
Loan and Security Agreement | Silicon Valley Bank (SVB) | Wall Street Journal Prime Rate                            
Debt Instrument [Line Items]                            
Basis spread on interest rate         3.89%                  
Loan and Security Agreement | Silicon Valley Bank (SVB) | Maximum                            
Debt Instrument [Line Items]                            
Maximum amount available under second draw         $ 15,000,000                  
Silicon Valley Bank and Life Sciences Fund II LLC | Series B Convertible Preferred Shares                            
Debt Instrument [Line Items]                            
Number of warrants to purchase preferred shares | shares         19,890     19,890   19,890     19,890  
Warrants to purchase preferred shares, exercise price | $ / shares         $ 282.75     $ 282.75   $ 282.75     $ 282.75  
2025 Exchangeable Notes                            
Debt Instrument [Line Items]                            
Interest expense               $ 205,000 205,000 $ 615,000 615,000      
Accretion of debt discounts and deferred financing costs               591,000 591,000 1,753,000 1,753,000      
Aggregate principal amount       $ 9,891,000                    
Debt instrument, outstanding principal               12,607,000   $ 12,607,000     $ 12,607,000  
Debt instrument, payment terms                   The Company will be required to pay each holder of the Exchangeable Notes the greater of three times the outstanding principal amount of such Exchangeable Note and the consideration that would be received by the holder of such Exchangeable Note in connection with such Fundamental Change if the holder had exchanged its note for ordinary shares immediately prior to the consummation of such Fundamental Change, plus any accrued and unpaid interest.        
Fair value of derivative liability       27,038,000                    
Fair value of derivative liability related to rights offering   $ 82,000                        
Financing transaction costs                       $ 2,848,000    
Financing transaction costs, capitalized           $ 2,814,000           $ 2,814,000    
2025 Exchangeable Notes | Private Placement                            
Debt Instrument [Line Items]                            
Aggregate principal amount       51,588,000                    
Debt instrument price per unit   1,000   1,000                    
Aggregate principal amount               39,201,000   $ 39,201,000     $ 39,201,000  
Notes exchanged for ordinary shares | shares                         3,592,555  
Debt instrument, outstanding principal               12,607,000   12,607,000     $ 12,607,000  
2025 Exchangeable Notes | Private Placement and Rights Offering                            
Debt Instrument [Line Items]                            
Aggregate principal amount   $ 220,000   $ 51,800,000                    
Debt instrument interest rate       6.50%                    
RLNs | Private Placement                            
Debt Instrument [Line Items]                            
Aggregate principal amount       $ 103,000                    
Number of debt instruments within each notes | Debtinstrument   50   50                    
RLNs | Private Placement and Rights Offering                            
Debt Instrument [Line Items]                            
Aggregate principal amount   $ 500   $ 100,000                    
Securities | Private Placement                            
Debt Instrument [Line Items]                            
Debt instrument price per unit   1,000   $ 1,000                    
Debt instrument, shares embedded within each unit, shares | shares 89.9035     66.666                    
Debt instrument, shares embedded within each unit, value $ 1,000 $ 1,000                        
Debt instrument, shares embedded within each unit, exchange price | $ / shares $ 11.123 $ 15                        
Paycheck Protection Program | Silicon Valley Bank (SVB) | Iterum Therapeutics US Limited                            
Debt Instrument [Line Items]                            
Interest expense               0 0 $ 0 0      
Aggregate principal amount     $ 744,000                      
Debt instrument interest rate     1.00%                      
Debt instrument maturity period     2 years                      
Debt instrument, description                   Under the terms of the agreement, there were no payments due by the Company until the SBA remitted the forgiveness amount to Iterum US Limited or until after the 10 months after the end of the six-month period beginning April 30, 2020 (the Deferral Period). Following the Deferral Period, equal monthly repayments of principal and interest were due to fully amortize the principal amount outstanding on the PPP loan by the maturity date.        
Debt instrument, forgiveness loan             $ 340,000              
Debt instrument, remaining amount amortized           $ 404,000                
Debt Instrument, principal repayments               $ 0 $ 0 $ 0 $ 69,000