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Inventories - Inventories (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 981,452 $ 1,008,653
Work in process 4,367,610 4,304,415
Finished goods 273,666 428,549
Total inventory 5,622,728 5,741,617
Less: noncurrent 4,678,013 4,865,181
Total - current $ 944,715 $ 876,436