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Prepaid Land Lease Payments - Summary of Prepaid Land Lease Payments (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Arrangements Involving Legal Form Of Lease [Abstract]    
Carrying amount, beginning balance $ 1,105 $ 1,794
Recognized lease expense during the year (35) (57)
Classified as held for sales   (566)
Exchange difference 33 (66)
Carrying amount, ending balance 1,103 1,105
Current portion included in prepayments 36 35
Non-current portion included in prepaid land lease payments $ 1,067 $ 1,070