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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Pay vs Performance Disclosure [Table]      
Pay vs Performance [Table Text Block]
Value of Initial Fixed $100 Investment Based On:
Summary Compensation Table Total for CEO (1)Compensation Actually Paid to CEO (1)(2)Average Summary Compensation Table Total for Non-CEO
NEOs (2)(3)		Average Compensation Actually Paid to Non-CEO
NEOs (2)(3)(4)		TSR (5)Peer Group TSR (5)Net Income (Loss)
(in millions)		Revenue Growth (6)
Year$$$$$$$%
202220,212,141 739,598 6,838,043 3,457,925 73.82113.65(443.3)49 %
202115,315,579 (30,500,547)6,176,702 (4,953,682)151.12126.45(704.5)195 %
20208,536,036 112,741,937 3,401,688 22,645,622 325.41126.42(268.9)277 %
    
Company Selected Measure Name Revenue growth    
Named Executive Officers, Footnote [Text Block] Samantha (Ying) Du has been the CEO of the Company since 2014.The Non-CEO NEOs included the following executives by year: 2022: Billy Cho, Rafael Amado, Harald Reinhart, Alan Bart Sandler, and Josh Smiley;
2021: Billy Cho, F. Ty Edmondson, Harald Reinhart, and Alan Bart Sandler; and
2020: Billy Cho, F. Ty Edmondson, Alan Bart Sandler, and Tao Fu. 		   
Peer Group Issuers, Footnote [Text Block] The TSR peer group consists of the NASDAQ Biotechnology Index.    
PEO Total Compensation Amount $ 20,212,141 $ 15,315,579 $ 8,536,036
PEO Actually Paid Compensation Amount $ 739,598 (30,500,547) 112,741,937
Adjustment To PEO Compensation, Footnote [Text Block] Deductions from, and additions to, total compensation in the Summary Compensation Table by year to calculate Compensation Actually Paid include:
202220212020
Samantha
(Ying) Du		Average
Non-CEO NEOs		Samantha
(Ying) Du		Average
Non-CEO NEOs		Samantha
(Ying) Du		Average
Non-CEO NEOs
Total Compensation from Summary Compensation Table20,212,141 6,838,043 15,315,579 6,176,702 8,536,036 3,401,688 
Adjustments for Equity Awards
Adjustment for grant date values in the Summary Compensation Table(18,545,040)(6,059,426)(13,672,864)(5,279,647)(7,160,000)(2,837,222)
Year-end fair value of unvested awards granted in the current year13,913,094 4,783,831 3,708,060 1,299,614 27,099,276 4,659,848 
Year-over-year difference of year-end fair values for unvested awards granted in prior years(10,827,207)(1,408,060)(36,638,677)(7,338,300)66,533,031 16,035,472 
Fair values at vest date for awards granted and vested in current year— — — 259,613 — — 
Difference in fair values between prior year-end fair values and vest date fair values for awards granted in prior years(4,013,390)(696,463)787,355 (71,664)17,733,594 1,385,836 
Total Adjustments for Equity Awards(19,472,543)(3,380,118)(45,816,126)(11,130,384)104,205,901 19,243,934 
Compensation Actually Paid (as calculated)739,598 3,457,925 (30,500,547)(4,953,682)112,741,937 22,645,622 
    
Non-PEO NEO Average Total Compensation Amount $ 6,838,043 6,176,702 3,401,688
Non-PEO NEO Average Compensation Actually Paid Amount $ 3,457,925 (4,953,682) 22,645,622
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Deductions from, and additions to, total compensation in the Summary Compensation Table by year to calculate Compensation Actually Paid include:
202220212020
Samantha
(Ying) Du		Average
Non-CEO NEOs		Samantha
(Ying) Du		Average
Non-CEO NEOs		Samantha
(Ying) Du		Average
Non-CEO NEOs
Total Compensation from Summary Compensation Table20,212,141 6,838,043 15,315,579 6,176,702 8,536,036 3,401,688 
Adjustments for Equity Awards
Adjustment for grant date values in the Summary Compensation Table(18,545,040)(6,059,426)(13,672,864)(5,279,647)(7,160,000)(2,837,222)
Year-end fair value of unvested awards granted in the current year13,913,094 4,783,831 3,708,060 1,299,614 27,099,276 4,659,848 
Year-over-year difference of year-end fair values for unvested awards granted in prior years(10,827,207)(1,408,060)(36,638,677)(7,338,300)66,533,031 16,035,472 
Fair values at vest date for awards granted and vested in current year— — — 259,613 — — 
Difference in fair values between prior year-end fair values and vest date fair values for awards granted in prior years(4,013,390)(696,463)787,355 (71,664)17,733,594 1,385,836 
Total Adjustments for Equity Awards(19,472,543)(3,380,118)(45,816,126)(11,130,384)104,205,901 19,243,934 
Compensation Actually Paid (as calculated)739,598 3,457,925 (30,500,547)(4,953,682)112,741,937 22,645,622 
    
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
CAP Versus Cumulative TSR for the Company and Cumulative TSR of the Peer Group

CAP vs TSR.jpg
    
Compensation Actually Paid vs. Net Income [Text Block]
CAP Versus Net Income
CAP vs Net Income.jpg
    
Compensation Actually Paid vs. Company Selected Measure [Text Block]
CAP Versus Revenue Growth

CAP vs Revenue Growth.jpg
    
Total Shareholder Return Vs Peer Group [Text Block]
CAP Versus Cumulative TSR for the Company and Cumulative TSR of the Peer Group

CAP vs TSR.jpg
    
Tabular List [Table Text Block] Revenue growth
•Product revenues
•Year-end cash and cash equivalents
    
Total Shareholder Return Amount $ 73.82 151.12 325.41
Peer Group Total Shareholder Return Amount 113.65 126.45 126.42
Net Income (Loss) $ (443,300,000) $ (704,500,000) $ (268,900,000)
Company Selected Measure Amount 0.49 1.95 2.77
PEO Name Samantha (Ying) Du    
Additional 402(v) Disclosure [Text Block] The valuation assumptions for stock option awards included in Compensation Actually Paid are as follows:
•The expected life of each stock option, which is determined using the “simplified method” and which takes into account the average of the remaining vesting period and remaining term as of the vest or fiscal year end date.
•The exercise price and the asset price, which are based on the closing price for our ADSs on Nasdaq on the vest and fiscal year end date, respectively.
•The risk-free rate, which is based on the Treasury Constant Maturity rate closest to the remaining expected life as of the vest or fiscal year end date.
•Our historical volatility, which is based on the daily price history for our ADSs traded on Nasdaq for each expected life prior to each vest or fiscal year end date.
•The annual dividend yield, which for Zai Lab was zero as we did not pay dividends and do not expect to pay any in the foreseeable future.
TSR is determined based on the value of an initial fixed investment of $100, and the reinvestment of all dividends are assumed.Revenue growth is calculated as follows: (total revenues from our audited annual consolidated statements of operations for the current year - total revenues from our audited annual consolidated statements of operations for the prior year) / total revenues from our audited annual consolidated statements of operations for the prior year. 		   
Measure [Axis]: 1      
Pay vs Performance Disclosure [Table]      
Measure Name Revenue growth    
Measure [Axis]: 2      
Pay vs Performance Disclosure [Table]      
Measure Name Product revenues    
Measure [Axis]: 3      
Pay vs Performance Disclosure [Table]      
Measure Name Year-end cash and cash equivalents    
PEO [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ (19,472,543) $ (45,816,126) $ 104,205,901
PEO [Member] | Stock Awards Adjustments [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (18,545,040) (13,672,864) (7,160,000)
PEO [Member] | Equity Awards Granted During the Year, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 13,913,094 3,708,060 27,099,276
PEO [Member] | Equity Awards Granted in Prior Years, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (10,827,207) (36,638,677) 66,533,031
PEO [Member] | Equity Awards Granted During the Year, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 0
PEO [Member] | Equity Awards Granted in Prior Years, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (4,013,390) 787,355 17,733,594
Non-PEO NEO [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (3,380,118) (11,130,384) 19,243,934
Non-PEO NEO [Member] | Stock Awards Adjustments [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (6,059,426) (5,279,647) (2,837,222)
Non-PEO NEO [Member] | Equity Awards Granted During the Year, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 4,783,831 1,299,614 4,659,848
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (1,408,060) (7,338,300) 16,035,472
Non-PEO NEO [Member] | Equity Awards Granted During the Year, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 259,613 0
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ (696,463) $ (71,664) $ 1,385,836