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Income Tax - Reconciliation of Deferred Tax Assets, Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation Of Changes In Deferred Tax Liability Asset [Abstract]      
Opening balance $ (200) $ (6) $ (132)
Tax (expenses)/benefit during the period recognized in profit or loss (730) (374) 55
Tax benefit during the period recognized in other comprehensive income 318 11 166
Exchange difference on translation foreign operations 93 169 (95)
Closing balance $ (519) $ (200) $ (6)