Cover - shares	9 Months Ended
	Sep. 30, 2020	Oct. 31, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-37686
Entity Registrant Name	BEIGENE, LTD.
Entity Incorporation, State or Country Code	E9
Entity Tax Identification Number	98-1209416
Entity Address, Street Address	c/o Mourant Governance Services (Cayman) Limited
Entity Address, Street Address Two	94 Solaris Avenue, Camana Bay
Entity Address, City	Grand Cayman
Entity Address, Country	KY
Entity Address, Postal Zip Code	KY1-1108
City Area Code	345
Local Phone Number	949-4123
Title of each class	American Depositary Shares, each representing 13 Ordinary Shares, par value $0.0001 per share
Trading Symbol(s)	BGNE
Name of each exchange on which registered	NASDAQ
Entity Common Stock, Shares Outstanding		1,182,916,659
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001651308
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3