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Income Tax - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Line Items] |  |  |
Taxable income | $ (50,384,176) | $ (37,512,212) | $ (18,021,737)
Provision for income taxes | 0 |  |
Amounts of operating loss carry forwards | $ 72,137,289 | $ 34,716,071 | $ 7,969,098
PRC |  |  |
Income Tax Disclosure [Line Items] |  |  |
Statutory income tax rate | 25.00% | 25.00% | 25.00%
Taxable income | $ (40,971,742) | $ (26,111,094) | $ (4,938,688)
Earliest Tax Year |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carry forwards expiration | Dec. 31, 2019 |  |
Latest Tax Year |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carry forwards expiration | Dec. 31, 2022 |  |
Zai Lab (AUST) Pty., Ltd |  |  |
Income Tax Disclosure [Line Items] |  |  |
Statutory income tax rate | 30.00% |  |
Taxable income | $ 0 | 0 | 0
Provision for income taxes | $ 0 | 0 | 0
Zai Lab (Hong Kong) Limited |  |  |
Income Tax Disclosure [Line Items] |  |  |
Statutory income tax rate | 16.50% |  |
Taxable income | $ 0 | 0 | 0
Provision for income taxes | $ 0 | $ 0 | $ 0
Zai Lab (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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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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