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Short-term Borrowings - Additional Information (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 12, 2018
USD ($)
Dec. 12, 2018
CNY (¥)
Jun. 25, 2018
USD ($)
Jun. 25, 2018
CNY (¥)
Zai Lab (Suzhou) Co., Ltd            
Line Of Credit Facility [Line Items]            
Facility agreement expiration period 3 years          
Facility agreement amount         $ 3,642,616 ¥ 25,000,000
Facility agreement, Outstanding amount $ 2,914,093 ¥ 20,000,000        
Facility agreement, Expiration year 2019          
Short-term borrowing, average interest rate 4.785%          
Zai Biopharmaceutical (Suzhou) Co., Ltd            
Line Of Credit Facility [Line Items]            
Facility agreement expiration period 3 years          
Facility agreement amount     $ 5,828,185 ¥ 40,000,000    
Facility agreement, Outstanding amount $ 728,523 ¥ 5,000,000        
Facility agreement, Expiration year 2019          
Short-term borrowing, average interest rate 4.785%