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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
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: