Subsequent Events - Additional Information (Details) - Iterum Therapeutics US Limited - Silicon Valley Bank (SVB) - Paycheck Protection Program - USD ($) $ in Millions		3 Months Ended
	Apr. 30, 2020	Mar. 31, 2020
Subsequent Event [Line Items]
Debt instrument, payment terms		Under the terms of the agreement, there shall be no payments due by the Company during the six-month period beginning April 30, 2020 (the Deferral Period). Following the Deferral Period, equal monthly repayments of principal and interest will be due to fully amortize the principal amount outstanding on the Note on the last day of the Deferral Period by the maturity date. Under the terms of the Program, the SBA will forgive the portion of loan proceeds used for U.S. payroll costs and other designated operating expenses for up to eight weeks, provided at least 75% of the loan proceeds are used for U.S. payroll costs.
Subsequent Event
Subsequent Event [Line Items]
Loans receivable with fixed annual interest rate	$ 0.7
Debt instrument, fixed annual interest rate	1.00%
Debt instrument maturity period	2 years
Minimum percentage of loan proceeds used for payroll costs	75.00%