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Business Combinations and Asset Acquisitions - BeiGene Pharmaceuticals (Guangzhou) Co., Limited (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 21, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition        
Purchase of intangible assets   $ 0 $ 553 $ 0
BeiGene Guangzhou | BeiGene Pharmaceuticals (Guangzhou) Co., Limited        
Business Acquisition        
Voting interest (percent) 100.00%      
Transaction cost $ 59      
Finite-lived intnagible asset acquired 816      
Deferred tax liability 204      
BeiGene Guangzhou | BeiGene Pharmaceuticals (Guangzhou) Co., Limited | Trading license        
Business Acquisition        
Purchase of intangible assets $ 612