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Income Tax - Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Income Tax Disclosure [Line Items] |  |  |
Taxable income | $ (128,617) | $ (83,274) |
Provision for income taxes | $ 0 | $ 0 |
Amounts of operating loss carry forwards |  |  | $ 403,460
Earliest Tax Year |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carry forwards expiration | Dec. 31, 2020 |  |
Latest Tax Year |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carry forwards expiration | Dec. 31, 2029 |  |
PRC |  |  |
Income Tax Disclosure [Line Items] |  |  |
Statutory income tax rate | 25.00% | 25.00% |
Taxable income | $ (112,320) | $ (76,299) |
Preferential tax rate | 15.00% |  |
Zai Lab (AUST) Pty., Ltd |  |  |
Income Tax Disclosure [Line Items] |  |  |
Statutory income tax rate | 30.00% |  |
Taxable income | $ 0 | 0 |
Provision for income taxes | $ 0 | 0 |
Zai Lab (US) LLC |  |  |
Income Tax Disclosure [Line Items] |  |  |
Statutory income tax rate | 21.00% |  |
Taxable income | $ 0 | 0 |
Provision for income taxes |  | $ 0 |
Zai Lab (Hong Kong) Limited |  |  |
Income Tax Disclosure [Line Items] |  |  |
Provision for income taxes | 0 |  |
Withholding taxes on remittance of dividends | $ 0 |  |
Zai Lab (Hong Kong) Limited | First two million |  |  |
Income Tax Disclosure [Line Items] |  |  |
Statutory income tax rate | 8.25% |  |
Zai Lab (Hong Kong) Limited | Above two million |  |  |
Income Tax Disclosure [Line Items] |  |  |
Statutory income tax rate | 16.50% |  |
Zai Lab (Shanghai) Co., Ltd |  |  |
Income Tax Disclosure [Line Items] |  |  |
Preferential tax rate | 15.00% |  |
Zai Lab International Trading (Shanghai) Co., Ltd |  |  |
Income Tax Disclosure [Line Items] |  |  |
Statutory income tax rate | 25.00% |  |
Zai Lab (Suzhou) Co., Ltd |  |  |
Income Tax Disclosure [Line Items] |  |  |
Statutory income tax rate | 25.00% |  |
Zai Biopharmaceutical (Suzhou) Co., Ltd |  |  |
Income Tax Disclosure [Line Items] |  |  |
Statutory income tax rate | 25.00% |  |

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