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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Jan. 02, 2020
Jul. 31, 2020
Jan. 31, 2020
Aug. 31, 2018
Jan. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 24, 2020
Shareholders' equity                  
Ordinary shares, par value (in dollars per share)           $ 0.0001 $ 0.0001    
Proceeds from sale of ordinary shares, net of cost           $ 4,232,017 $ 0 $ 0  
Amgen, Inc                  
Shareholders' equity                  
Shares issued (in shares)   29,614,832              
Proceeds from sale of ordinary shares, net of cost   $ 421,443              
Beigene Ltd | Amgen, Inc                  
Shareholders' equity                  
Minority interest in investment (as a percent) 20.50%   20.50%            
Direct purchase option ownership target (as a percent)                 20.60%
Direct purchase option minimum trigger (as a percent)                 20.40%
Amgen, Inc                  
Shareholders' equity                  
Shares issued (in shares) 15,895,001   15,895,001            
Per share acquisition price (in dollars per share) $ 174.85   $ 174.85            
Proceeds from sale of ordinary shares, net of cost $ 2,779,241   $ 2,779,241            
Ordinary Shares                  
Shareholders' equity                  
Shares issued (in shares)           145,838,979      
Follow-on public offering                  
Shareholders' equity                  
Share price, ADS (in dollars per share)         $ 101.00        
Share price (in dollars per share)         $ 7.77        
Shares issued, American Depository Shares (in shares)         7,425,750        
Shares issued (in shares)         96,534,750        
Net proceeds, underwriting discounts       $ 32,947 $ 42,413        
Net proceeds, offering expenses       $ 869,709 $ 757,587        
Follow-on public offering | Ordinary Shares                  
Shareholders' equity                  
Share price, ADS (in dollars per share)       $ 178.90          
Share price (in dollars per share)       $ 13.76          
Shares issued (in shares)       65,600,000       102,970,400  
Over-Allotment Option                  
Shareholders' equity                  
Shares issued, American Depository Shares (in shares)         495,050        
Shares issued (in shares)         6,435,650        
Registered Direct Offering                  
Shareholders' equity                  
Sale of stock shares received (in shares)   145,838,979              
Ordinary shares, par value (in dollars per share)   $ 0.0001              
Per share acquisition price (in dollars per share)   14.2308              
Sale of stock, share price, ADS (in dollars per share)   $ 185.00              
Proceeds from sale of ordinary shares, net of cost   $ 2,069,610