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Taxation - Summary of Changes in Deferred Tax Asset and Liability Balances (Detail) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Deferred tax assets: |  |  |  |  |
Net operating losses carried forward (note a) | [1] | $ 32,458,000 | $ 27,712,000 |  |
Impairment of long-term equity investment |  | 4,233,000 | 4,061,000 |  |
Impairment of other receivables |  | 1,858,000 | 1,553,000 |  |
Impairment of accounts receivable |  | 1,451,000 | 1,140,000 |  |
Impairment of inventories |  | 540,000 | 549,000 |  |
Allowance for advance to suppliers |  | 369,000 | 346,000 |  |
Impairment of property and equipment |  | 15,000 | 14,000 |  |
Valuation allowance |  | (40,924,000) | (34,257,000) | $ (20,181,000) | $ (16,599,000)
Total deferred tax assets, net | [2] |  | 1,118,000 |  |
Deferred tax liabilities: |  |  |  |  |
Deferred credit arising from an asset acquisition |  | (1,085,000) | $ (1,179,000) |  |
Accumulated net operating loss which can be carried forward indefinitely |  | 3,079,000 |  |  |
Accumulated net operating loss which can be carried forward and will expire during the period from 2021 to 2030 |  | $ 179,797,000 |  |  |
[1] | As of December 31, 2020, the accumulated net operating loss of USD 3,079,000 of the Group’s subsidiaries incorporated in Hong Kong can be carried forward indefinitely to offset future taxable income, the remaining accumulated net operating loss of USD 179,797,000 mainly arose from the Company’s subsidiaries and consolidated VIEs established in the PRC, which can be carried forward to offset future taxable income and will expire during the period from 2021 to 2030.
[2] | As of December 31, 2019 and 2020, the deferred tax assets and liabilities balances are expected to be recoverable as follows:

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