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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)

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