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INCOME TAXES - Principal components of the deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets    
Provision for doubtful accounts $ 2,249 $ 2,165
Inventory 4,510 4,510
Prepaid expenses and other current assets 4,865 5,629
Property and equipment, net 124 124
Accrued payroll and welfare 119 107
Accrued liabilities 357 345
Advertising fee 6 5
Employee education fee 13 13
Net operating loss carry forwards 12,811 10,738
Total Deferred tax assets 25,054 23,636
Less: valuation allowance $ (25,054) $ (23,636)