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Organization and Principal Activities - Schedule of Significant Operating Subsidiaries (Details)
12 Months Ended
Dec. 31, 2017
Zai Lab (Hong Kong) Limited  
Subsidiary Of Limited Liability Company Or Limited Partnership [Line Items]  
Place of incorporation Hong Kong
Date of incorporation Apr. 29, 2013
Percentage of ownership 100.00%
Principal activities Operating company for business development and R&D activities
Zai Lab (Shanghai) Co., Ltd  
Subsidiary Of Limited Liability Company Or Limited Partnership [Line Items]  
Place of incorporation The People's Republic of China ("PRC" or "China")
Date of incorporation Jan. 06, 2014
Percentage of ownership 100.00%
Principal activities Development and commercialisation of innovative medicines
Zai Lab (AUST) Pty., Ltd  
Subsidiary Of Limited Liability Company Or Limited Partnership [Line Items]  
Place of incorporation Australia
Date of incorporation Dec. 10, 2014
Percentage of ownership 100.00%
Principal activities Clinical trial activities
Zai Lab (Suzhou) Co., Ltd  
Subsidiary Of Limited Liability Company Or Limited Partnership [Line Items]  
Place of incorporation PRC
Date of incorporation Nov. 30, 2015
Percentage of ownership 100.00%
Principal activities Development and commercialisation of innovative medicines
Zai Biopharmaceutical (Suzhou) Co., Ltd  
Subsidiary Of Limited Liability Company Or Limited Partnership [Line Items]  
Place of incorporation PRC
Date of incorporation Jun. 15, 2017
Percentage of ownership 100.00%
Principal activities Development and commercialisation of innovative medicines