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Subsequent Events - Additional Information (Details) |  |  |  | 1 Months Ended | 6 Months Ended |
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Aug. 05, 2020 USD ($) Debtinstrument Unit | Jul. 02, 2020 $ / shares shares | Jan. 21, 2020 Debtinstrument | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 $ / shares shares | Dec. 31, 2019 $ / shares shares
Subsequent Event [Line Items] |  |  |  |  |  |
Ordinary shares, shares issued | shares |  |  |  | 17,852,149 | 17,852,149 | 14,868,973
Ordinary shares, par value | $ / shares |  |  |  | $ 0.01 | $ 0.01 | $ 0.01
June 30 Offering | Securities Purchase Agreement |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Ordinary shares, shares issued | shares |  |  |  | 3,372,686 | 3,372,686 |
Ordinary shares, par value | $ / shares |  |  |  | $ 0.01 | $ 0.01 |
Purchase price per share | $ / shares |  |  |  | $ 1.4825 | 1.4825 |
Aggregate gross proceeds from ordinary shares |  |  |  | $ 5,000,000 |  |
Net proceeds |  |  |  | $ 4,400,000 |  |
Private Placement | RLNs |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of debt instruments within each notes | Debtinstrument |  |  | 50 |  |  |
Private Placement | Securities Purchase Agreement |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares |  |  |  | $ 1.42 | $ 1.42 |
Warrants expiry date |  |  |  | Jan. 02, 2026 |  |
Warrants closing date |  |  |  | Jul. 02, 2020 |  |
Rights Offering in Connection with Private Placement |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Rights offering description |  |  |  |  | Each right will entitle the holder to purchase, at the holder’s election and subject to availability, at a subscription price of $1,000 per unit, one unit consisting of (i) a 6.500% Exchangeable Notes, to be issued by Iterum Bermuda in the original principal amount of $1,000, fully and unconditionally guaranteed on an unsecured senior subordinated basis by the Company, Iterum Therapeutics International Limited, Iterum Therapeutics US Limited and Iterum Therapeutics US Holding Limited (collectively, the Guarantors), and (ii) 50 Limited Recourse RLNs, to be issued by Iterum Bermuda, fully and unconditionally guaranteed on an unsecured senior subordinated basis by the Guarantors. The Company will only accept subscription rights for up to 8,400 units for a total purchase price of $8.4 million, which amount is approximately equal to the maximum aggregate principal amount of additional notes that may be issued under the indentures pursuant to which the Exchangeable Notes and RLNs will be issued. The Company anticipates that the subscription period for the planned rights offering will begin on or about August 11, 2020, or as soon as practicable thereafter, and continue for a period of at least 20 calendar days. A registration statement relating to the planned rights offering has been filed with the SEC but has not yet become effective. The planned rights offering will be made pursuant to such registration statement and a prospectus to be filed with the SEC prior to the commencement of the planned rights offering. The expected timing of the planned rights offering is subject to change. The Company may not receive all or any of the $8.4 million it will be seeking to raise in the planned rights offering. The Company reserves the right to cancel or terminate the planned rights offering at any time. |
Subsequent Event | Private Placement | Securities Purchase Agreement |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of warrants to purchase ordinary shares | shares |  | 236,088 |  |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares |  | $ 1.8531 |  |  |  |
Warrants expiry date |  | Jun. 30, 2025 |  |  |  |
Percentage of ordinary shares issued to purchase warrants |  | 7.00% |  |  |  |
Subsequent Event | Rights Offering in Connection with Private Placement |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Subscription price per unit | $ 1,000 |  |  |  |  |
Maximum number of units for which subscription rights are accepted | Unit | 8,400 |  |  |  |  |
Purchase price for subscription rights | $ 8,400,000 |  |  |  |  |
Planned rights offering | $ 8,400,000 |  |  |  |  |
Subsequent Event | Rights Offering in Connection with Private Placement | Exchangeable Notes |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Debt instrument interest rate | 6.50% |  |  |  |  |
Debt instrument price per unit | $ 1,000.00 |  |  |  |  |
Subsequent Event | Rights Offering in Connection with Private Placement | RLNs |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of debt instruments within each notes | Debtinstrument | 50 |  |  |  |  |
Maximum | Private Placement | Securities Purchase Agreement |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of warrants to purchase ordinary shares | shares |  |  |  | 1,686,343 | 1,686,343 |

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