Land Use Right - Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Land use right, net
Amortization expense of land use rights	$ 61	$ 0	$ 122	$ 0

The aggregate expense charged against earnings to allocate the cost of land use rights.

No definition available.

Name:	bgne_LandUseRightsAmortizationExpense
Namespace Prefix:	bgne_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration