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Condensed Consolidating Financial Statements - Additional Information (Details) | Sep. 08, 2020 USD ($) Debtinstrument | Jan. 21, 2020 USD ($) Debtinstrument
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Iterum Therapeutics Bermuda Limited |  |
Condensed Financial Statements Captions [Line Items] |  |
Ownership percentage |  | 100.00%
Subsidiary Guarantors |  |
Condensed Financial Statements Captions [Line Items] |  |
Ownership percentage |  | 100.00%
Private Placement | 2025 Exchangeable Notes |  |
Condensed Financial Statements Captions [Line Items] |  |
Aggregate principal amount |  | $ 51,588,000
Debt instrument price per unit |  | 1,000
Private Placement | RLNs |  |
Condensed Financial Statements Captions [Line Items] |  |
Aggregate principal amount |  | $ 103,000
Number of debt instruments within each notes | Debtinstrument | 50 | 50
Rights Offering | 2025 Exchangeable Notes |  |
Condensed Financial Statements Captions [Line Items] |  |
Aggregate principal amount | $ 220,000 |
Rights Offering | RLNs |  |
Condensed Financial Statements Captions [Line Items] |  |
Aggregate principal amount | $ 440 |

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