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Inventories (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Inventory Disclosure [Abstract]        
Inventory write-down $ 324,984 $ 267,117 $ 663,041 $ 724,156