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Condensed Consolidating Financial Statements - Additional Information (Details) | Jan. 21, 2020 USD ($) Debtinstrument | Sep. 30, 2021 USD ($) | Sep. 08, 2020 USD ($)
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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% |  |
2025 Exchangeable Notes |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |
Aggregate principal amount |  | $ 12,600,000 |
Private Placement | 2025 Exchangeable Notes |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |
Aggregate principal amount | $ 51,600,000 |  |
Debt instrument price per unit | 1,000 |  |
Private Placement | RLNs |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |
Aggregate principal amount | $ 100,000 |  |
Number of debt instruments within each notes | Debtinstrument | 50 |  |
Rights Offering | 2025 Exchangeable Notes |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |
Aggregate principal amount |  |  | $ 200,000
Rights Offering | RLNs |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |
Aggregate principal amount |  |  | $ 20,000.00

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