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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

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