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Taxation - Summary of Changes in Deferred Tax Asset and Liability Balances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets, current portion:    
Net operating loss carried forward $ 0 $ 1,276
Amortization of intangible assets arising from intragroup transactions 0 51
Valuation allowance 0 (106)
Deferred tax assets, current portion, net 1,221
Deferred tax assets, non-current portion:    
Net operating loss carried forward 19,246 12,093
Impairment of long-term equity investment 562 348
Allowance for advance to suppliers 88 576
Impairment of Intangible asset 686 0
Impairment of fixed asset 151 0
Impairment of other receivables 1,938 0
Valuation allowance (16,599) (9,745)
Deferred tax assets, non-current portion, net [1] 6,072 3,272
Deferred tax liabilities, non-current portion:    
Outside basis difference $ (635)
[1] As at December 31, 2017, the deferred tax asset and liability balances are expected to be recoverable as follows