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OTHER ACCRUED LIABILITIES (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
OTHER ACCRUED LIABILITIES |  |
Prepayments from customers | $ 1,686,868 | $ 998,601
Accrued professional fees | 331,204 | 263,757
Current portion - preferred stock repurchase | 1,092,282 |
Other accrued expenses | 288,550 | 124,791
Total | $ 3,398,904 | $ 1,387,149

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