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Income Tax - Reconciliation of Deferred Tax Assets, Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation Of Changes In Deferred Tax Liability Asset [Abstract]      
Opening balance $ (6) $ (132) $ 526
Tax benefit/(expenses) during the period recognized in profit or loss (374) 55 (1,073)
Tax benefit/(expenses) during the period recognized in other comprehensive income 11 166 170
Exchange difference on translation foreign operations 169 (95) 245
Closing balance $ (200) $ (6) $ (132)