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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 |  |  |  |  |

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