| Document and Entity Information Document | Sep. 17, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 17, 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 |
