| Document and Entity Information Document | May 19, 2021 | Nov. 05, 2020 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | May 19, 2021 | |
| Entity Registrant Name | BEIGENE, LTD. | |
| Entity Incorporation, State or Country Code | E9 | |
| Entity File Number | 001-37686 | |
| Entity Tax Identification Number | 98-1209416 | |
| Entity Address, Address Line One | c/o Mourant Governance Services (Cayman) Limited | |
| Entity Address, Address Line Two | 94 Solaris Avenue, Camana Bay | |
| Entity Address, City or Town | Grand Cayman | |
| Entity Address, Postal Zip Code | KY1-1108 | |
| Entity Address, Country | KY | |
| City Area Code | 345 | |
| Local Phone Number | 949-4123 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Title of 12(b) Security | American Depositary Shares, each representing 13 Ordinary Shares, par value $0.0001 per share | |
| Trading Symbol | BGNE | |
| Security Exchange Name | NASDAQ | |
| Entity Emerging Growth Company | false | |
| Entity Central Index Key | 0001651308 | |
| Amendment Flag | false |
