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Contract liabilities and deferred income - Schedule of Contract liabilities and deferred income (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Contract Liabilities And Deferred Income [Line Items]    
Deferred revenue and income, non-current [1] $ 1,223 $ 1,850
Contract Liabilities 27,000 25,900
Membership subscription [Member]    
Contract Liabilities And Deferred Income [Line Items]    
Deferred revenue and income, non-current 781,000 517,000
Government grants [Member]    
Contract Liabilities And Deferred Income [Line Items]    
Deferred revenue and income, non-current $ 442 $ 1,333,000
[1] As of December 31, 2019, the non-current portion consists of membership subscription of USD 781,000 (2018: USD 517,000),and government grants of USD 442,000 (2018: USD 1,333,000).