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Taxation - Summary of Changes in Deferred Tax Asset and Liability Balances (Detail) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:          
Net operating losses carried forward (note a) [1] $ 39,188,000 $ 32,458,000      
Impairment of long-term equity investment 4,245,000 4,233,000      
Impairment of other receivables 1,536,000 1,858,000      
Impairment of accounts receivable 402,000 1,451,000      
Impairment of inventories 70,000 540,000      
Allowance for advance to suppliers 137,000 369,000      
Impairment of property and equipment 2,000 15,000      
Valuation allowance (45,580,000) (40,924,000) $ (34,257,000) $ (34,257,000) $ (20,181,000)
Total deferred tax assets, net [2] 0 0      
Deferred tax liabilities:          
Deferred credit arising from an asset acquisition (930,000) $ (1,085,000)      
Accumulated net operating loss which can be carried forward indefinitely 5,875,000        
Accumulated net operating loss which can be carried forward and will expire during the period from 2021 to 2030 $ 221,906,000        
[1] As of December 31, 2021, the accumulated net operating loss of USD5,875,000 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 USD221,906,000 mainly arose from the Company’s subsidiaries, VIE and VIE’s subsidiaries established in the PRC, which can be carried forward to offset future taxable income and will expire during the period from 2022 to 2030.
[2] As of December 31, 2020 and 2021, the deferred tax liabilities balances are expected to be recoverable as follows: