| Document and Entity Information Document | Dec. 27, 2020 | Dec. 07, 2020 | Nov. 05, 2020 |
| Cover [Abstract] | |||
| Document Type | 8-K | ||
| Document Period End Date | Dec. 27, 2020 | ||
| 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 |
