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Taxation - Summary of Changes in Deferred Tax Asset and Liability Balances (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Deferred tax assets, non-current portion: |  |  |  |  |
Net operating losses carried forward (note a) | [1] | $ 27,712 | $ 20,479 |  |
Impairment of long-term equity investment |  | 4,061 | 1,760 |  |
Allowance for advance to suppliers |  | 346 | 351 |  |
Impairment of property and equipment |  | 14 | 32 |  |
Impairment of other receivables |  | 1,553 | 2,126 |  |
Impairment of accounts receivable |  | 1,140 | 1,094 |  |
Impairment of inventories |  | 549 | 29 |  |
Valuation allowance |  | (34,257) | (20,181) | $ (16,599) | $ (9,851)
Total deferred tax assets, net | [2] | 1,118 | 5,690 |  |
Deferred tax liabilities, non-current portion: |  |  |  |  |
Deferred credit arising from asset acquisition |  | (1,179) | $ (1,366) |  |
Net operating tax loss carryforwards |  | $ 166,447 |  |  |
[1] | As of December 31, 2019, the Group had tax loss carryforwards of USD166,447,000 which can be carried forward to offset future taxable income and will expire during the period from 2020 to 2025.
[2] | As at December 31, 2018 and 2019, the deferred tax assets and liabilities balances are expected to be recoverable as follows:

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