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Guangzhou Biologics Business (Details)	1 Months Ended			9 Months Ended
Guangzhou Biologics Business (Details)	Sep. 30, 2020 CNY (¥) option	Sep. 30, 2020 USD ($)	Mar. 31, 2017 CNY (¥) asset	Sep. 30, 2021 USD ($) option	Nov. 30, 2020 USD ($)	Oct. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) option	Mar. 07, 2017 CNY (¥)
Zhuhai Hillhouse (the "Related Party Loan") \| Loans Payable
Organization
Maximum borrowing capacity	¥ 400,000,000						$ 58,912,000
Senior Loan \| China Minsheng Bank (the "Senior Loan") \| Loans Payable
Organization
Extension options (option) \| option	2			2			2
Extension period (month)	12 months	12 months		12 months
Senior Loan \| Senior Notes \| China Minsheng Bank (the "Senior Loan")
Organization
Maximum borrowing capacity							$ 200,000,000
Senior loan Reserved For JV Purchase \| China Minsheng Bank (the "Senior Loan") \| Loans Payable
Organization
Maximum borrowing capacity				$ 120,000,000
Senior loan Reserved For JV Purchase \| Senior Notes \| China Minsheng Bank (the "Senior Loan")
Organization
Maximum borrowing capacity							120,000,000
Working Capital \| China Minsheng Bank (the "Senior Loan") \| Loans Payable
Organization
Maximum borrowing capacity				$ 80,000,000
Working Capital \| Senior Notes \| China Minsheng Bank (the "Senior Loan")
Organization
Maximum borrowing capacity							80,000,000
JV Share Repurchase \| Acquisition Facility \| Loans Payable
Organization
Maximum borrowing capacity						$ 118,320,000
Related Party Loan \| Zhuhai Hillhouse (the "Related Party Loan")
Organization
Shareholder loan	¥ 100,000,000						15,520,000
Related Party Loan \| Junior Notes \| Zhuhai Hillhouse (the "Related Party Loan")
Organization
Maximum borrowing capacity	500,000,000						73,640,000
Junior Loan General Corporate Use \| Zhuhai Hillhouse (the "Related Party Loan")
Organization
Maximum borrowing capacity							14,728,000
Junior Loan General Corporate Use \| Zhuhai Hillhouse (the "Related Party Loan") \| Loans Payable
Organization
Maximum borrowing capacity \| ¥	100,000,000
BeiGene (Hong Kong) Co., Limited.(“BeiGene HK”)
Organization
Cash capital contribution, agreed amount \| ¥			¥ 200,000,000
Minimum number of biologics assets to be contributed \| asset			1
Noncontrolling interest							19,599,000
BeiGene (Hong Kong) Co., Limited.(“BeiGene HK”) \| BeiGene Biologics Co., Ltd. (BeiGene Biologics)
Organization
Ownership percentage immediately after transaction (as a percent)			95.00%
Payment to acquire interest in JV	¥ 195,262,000	$ 28,723,000
Noncontrolling interest					$ 0		$ 9,116,000
Ownership percentage (as a percent)	100.00%						100.00%
BeiGene Biologics Co., Ltd. (BeiGene Biologics) \| Shareholder Loan \| Convertible Debt
Organization
Face amount	¥ 900,000,000						$ 132,061,000
Debt instrument accrued interest	¥ 249,140,000						$ 36,558,000
BeiGene Biologics Co., Ltd. (BeiGene Biologics) \| Shareholder Loan \| Convertible Debt \| Investor
Organization
Face amount \| ¥								¥ 900,000,000
GET
Organization
Cash capital contribution, agreed amount \| ¥			¥ 100,000,000
GET \| BeiGene Biologics Co., Ltd. (BeiGene Biologics)
Organization
Minority interest in investment (as a percent)	5.00%		5.00%				5.00%