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Income Tax - Reconciliation of Deferred Tax Assets, Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation Of Changes In Deferred Tax Liability Asset [Abstract]      
Opening balance $ 526 $ 1,601 $ 1,831
Tax benefit/(expenses) during the period recognized in profit or loss (1,073) (1,135) 135
Tax benefit/(expenses) during the period recognized in other comprehensive income 170 20 47
Exchange difference on translation foreign operations 245 40 (412)
Closing balance $ (132) $ 526 $ 1,601