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Basis of Presentation - Additional Information (Details) |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
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Feb. 10, 2021 USD ($) $ / shares shares | Feb. 09, 2021 USD ($) $ / shares shares | Feb. 08, 2021 $ / shares shares | Feb. 03, 2021 $ / shares shares | Nov. 02, 2020 USD ($) $ / shares shares | Oct. 31, 2020 $ / shares shares | Oct. 27, 2020 USD ($) $ / shares shares | Jul. 02, 2020 $ / shares shares | Jun. 05, 2020 $ / shares shares | Jun. 03, 2020 USD ($) $ / shares shares | Apr. 30, 2020 USD ($) | Jan. 21, 2020 USD ($) Debtinstrument $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Nov. 30, 2020 USD ($) | Oct. 31, 2020 $ / shares shares | Jun. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / shares shares | Jan. 28, 2021 $ / shares | Sep. 08, 2020 USD ($) | Jun. 10, 2020 $ / shares | Jul. 16, 2019 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of deferring payment on US payroll taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | In April 2020, the Company began deferring payment on its share of U.S. payroll taxes owed, as allowed by the Coronavirus Aid, Relief and Economic Security Act (CARES Act) through December 31, 2020. The Company is able to defer half of its share of U.S. payroll taxes owed until December 31, 2021, with the remaining half due on December 31, 2022. |  |  |  |  |  |
Ordinary shares, shares issued | shares |  |  |  |  |  |  |  |  |  |  |  |  | 49,431,028 |  |  |  | 182,775,282 |  | 182,775,282 | 182,775,282 |  | 49,431,028 |  |  |  |
Ordinary shares, par value | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  | $ 0.01 |  | $ 0.01 | $ 0.01 |  | $ 0.01 | $ 0.01 |  | $ 0.01 |
Proceeds from registered direct offerings, net of transaction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |
Number of warrants to purchase ordinary shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 380,000 |  | 380,000 | 380,000 |  |  |  |  |  |
Net losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (3,741,000) | $ 12,199,000 |  | $ 87,382,000 | $ 40,820,000 | $ 52,006,000 |  |  |  |
Accumulated deficit |  |  |  |  |  |  |  |  |  |  |  |  | $ 286,929,000 |  |  |  | 374,311,000 |  | $ 374,311,000 | 374,311,000 |  | 286,929,000 |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  | 14,508,000 |  |  |  | 35,982,000 |  | 35,982,000 | 35,982,000 |  | 14,508,000 |  |  |  |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,729,000 |  | $ 49,729,000 | $ 49,729,000 |  |  |  |  |  |
June 3 SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 | $ 0.01 |  |  |  |  |  |
June 30 SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 | $ 0.01 |  |  |  |  |  |
February SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares issued | shares |  | 17,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value | $ / shares |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering price per share | $ / shares |  | $ 2.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate gross proceeds from ordinary shares |  | $ 35,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from registered direct offerings, net of transaction costs |  | $ 32,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ordinary shares issued to purchase warrants |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering closing date |  | Feb. 12, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
February SPA | Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares | shares |  | 1,225,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares |  | $ 2.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants expiry date |  | Feb. 09, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity period |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, description |  |  |  |  |  |  |  |  |  |  | Under the terms of the agreement, there shall be no payments due by the Company until the SBA remits the forgiveness amount to the Borrower or 10 months after the end of 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 PPP loan by the maturity date. |  |  |  |  |  |  |  |  | Under the terms of the agreement, there shall be no payments due by the Company until the SBA remits the forgiveness amount to the Borrower or until after 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 PPP loan by the maturity date. |  |  |  |  |  |
Debt instrument, forgiveness loan |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 340,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, remaining amount amortized |  |  |  |  |  |  |  |  |  |  |  |  | $ 404,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate initial offering price of securities authorized to issue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000.0
2025 Exchangeable Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,600,000 |  | $ 12,600,000 | $ 12,600,000 |  |  |  |  |  |
Private Placement and Rights Offering | 2025 Exchangeable Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 51,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  |  |  |  |  |  |  |  |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement and Rights Offering | RLNs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement | June 3 SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares | shares |  |  |  |  |  |  |  |  | 208,023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares |  |  |  |  |  |  |  |  | $ 2.1031 | $ 1.62 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants expiry date |  |  |  |  |  |  |  |  | Jun. 03, 2025 | Dec. 05, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants closing date |  |  |  |  |  |  |  |  |  | Jun. 05, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ordinary shares issued to purchase warrants |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement | June 30 SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares | shares |  |  |  |  |  |  |  | 236,088 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares |  |  |  |  |  |  |  | $ 1.8531 |  |  |  |  |  |  |  | $ 1.42 |  |  |  |  |  |  |  |  |  |
Warrants expiry date |  |  |  |  |  |  |  | Jun. 30, 2025 |  |  |  |  |  |  |  | Jan. 02, 2026 |  |  |  |  |  |  |  |  |  |
Warrants closing date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 02, 2020 |  |  |  |  |  |  |  |  |  |
Percentage of ordinary shares issued to purchase warrants |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement | Maximum | June 3 SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares | shares |  |  |  |  |  |  |  |  |  | 1,485,885 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement | Maximum | June 30 SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,686,343 |  |  |  |  |  |  |  |  |  |
Private Placement | 2025 Exchangeable Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | 51,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument price per unit |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement | RLNs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt instruments within each notes | Debtinstrument |  |  |  |  |  |  |  |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, aggregate potential payment capped rate |  |  |  |  |  |  |  |  |  |  |  | 4,000 times |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement | Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, shares embedded within each unit, shares | shares |  |  |  |  | 1,286.1845 |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, shares embedded within each unit, value |  |  |  |  | $ 1,000 |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rights Offering in Connection with Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum subscription units to be accepted | shares |  |  |  |  |  |  |  |  |  |  |  | 220 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rights Offering in Connection with Private Placement | 2025 Exchangeable Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,600,000 |  | 12,600,000 | $ 12,600,000 |  |  |  | $ 200,000 |  |
Debt instrument price per unit |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument price per unit |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, shares embedded within each unit, shares | shares |  |  |  |  | 1,286.1845 |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, shares embedded within each unit, value |  |  |  |  | $ 1,000 |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, shares embedded within each unit, exchange price | $ / shares |  |  |  |  | $ 0.7775 |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of exchangeable notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,200,000 |  |  |  |  |  |  |
Debt instrument, aggregate number of shares exchanged | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,888,331 |  |  |  |  |  |  |
Rights Offering in Connection with Private Placement | RLNs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000.00 |  |
Number of debt instruments within each notes | Debtinstrument |  |  |  |  |  |  |  |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount payable per unit |  |  |  |  |  |  |  |  |  |  |  | $ 160.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, aggregate potential payment capped rate |  |  |  |  |  |  |  |  |  |  |  | 4,000 times |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rights Offering in Connection with Private Placement | RLNs | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, percentage of net revenue from domestic sale for potential aggregate payments |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rights Offering in Connection with Private Placement | RLNs | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, percentage of net revenue from domestic sale for potential aggregate payments |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rights Offering in Connection with Private Placement | Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of securities |  |  |  |  |  |  |  |  |  |  |  | $ 45,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct Offering | June 3 SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares issued | shares |  |  |  |  |  |  |  |  |  | 2,971,770 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering price per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 1.6825 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate gross proceeds from ordinary shares |  |  |  |  |  |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from registered direct offerings, net of transaction costs |  |  |  |  |  |  |  |  |  | $ 4,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct Offering | June 30 SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares issued | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,372,686 |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |
Offering price per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.4825 |  |  |  |  |  |  |  |  |  |
Aggregate gross proceeds from ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |  |  |  |  |
Proceeds from registered direct offerings, net of transaction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,200,000 |  |  |  |  |  |  |  |  |  |
October Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares issued | shares |  |  |  |  |  |  | 15,511,537 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value | $ / shares |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 | $ 0.01 |  |  |  |  |  |
Aggregate gross proceeds from ordinary shares |  |  |  |  |  |  | $ 17,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from registered direct offerings, net of transaction costs |  |  |  |  |  |  | $ 15,500,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,900,000 |  |  |  |  |  |
Number of warrants to purchase ordinary shares | shares |  |  |  |  |  | 1,884,615 |  |  |  |  |  |  |  |  | 1,884,615 |  | 20,890,516 |  | 20,890,516 | 20,890,516 |  |  |  |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares |  |  |  |  |  | $ 0.8125 | $ 0.65 |  |  |  |  |  |  |  | $ 0.8125 |  |  |  |  |  |  |  |  |  |  |
Warrants expiry date |  |  |  |  |  | Oct. 22, 2025 | Oct. 27, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ordinary shares issued to purchase warrants |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
October Offering | Pre-Funded Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering price per share | $ / shares |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from registered direct offerings, net of transaction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 110,000 |  |  |  |
Number of warrants to purchase ordinary shares | shares |  |  |  |  |  |  | 11,411,539 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares |  |  |  |  |  |  | $ 0.64 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ordinary share at election of purchaser |  |  |  |  |  |  | 9.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
October Offering | Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering price per share | $ / shares |  |  |  |  |  |  | $ 0.65 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares | shares |  |  |  |  |  |  | 20,192,307 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares |  |  |  |  |  |  | $ 0.65 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
October Offering | Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares | shares |  |  |  |  |  | 1,884,615 |  |  |  |  |  |  |  |  | 1,884,615 |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares |  |  |  |  |  | $ 0.8125 |  |  |  |  |  |  |  |  | $ 0.8125 |  |  |  |  |  |  |  |  |  |  |
Warrants expiry date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 22, 2025 |  |  |  |  |  |  |  |  |  |  |
Percentage of ordinary shares issued to purchase warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |
Description of purchase agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | In connection with the October Offering, the Company entered into a Securities Purchase Agreement (the Purchase Agreement) on October 22, 2020 with certain institutional investors. The Purchase Agreement contains customary representations and warranties of the Company, termination rights of the parties, and certain indemnification obligations of the Company. |  |  |  |  |  |
October Offering | Minimum | Pre-Funded Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of beneficial ownership that certain purchasers didn't want to exceed |  |  |  |  |  |  | 4.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
October Offering | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares | shares |  |  |  |  |  |  | 20,192,307 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
February Underwritten Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares | $ 1.4375 |  | $ 1.4375 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants expiry date | Feb. 03, 2026 |  | Feb. 03, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ordinary shares issued to purchase warrants | 7.00% |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering closing date | Feb. 10, 2021 |  | Feb. 08, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional ordinary shares that can be purchased by underwriter | shares | 5,217,391 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
February Underwritten Offering | Underwriting Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares issued | shares |  |  |  | 34,782,609 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value | $ / shares |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering price per share | $ / shares |  |  |  | $ 1.15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering closing date |  |  |  | Feb. 08, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
February Underwritten Offering | Pursuant to the Underwriting Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares issued | shares | 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate gross proceeds from ordinary shares | $ 46,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from registered direct offerings, net of transaction costs | $ 42,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ordinary shares issued to purchase warrants | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional ordinary shares that can be purchased by underwriter | shares | 5,217,391 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
February Underwritten Offering | Pursuant to the Underwriting Agreement | Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares | shares | 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares | $ 1.4375 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants expiry date | Feb. 03, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
February Underwritten Offering | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares | shares | 365,217 |  | 2,434,783 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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