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Inventories - Inventories (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 820,227 | $ 1,008,653
Work in process | 4,163,251 | 4,304,415
Finished goods | 447,856 | 428,549
Total inventories, net | 5,431,334 | 5,741,617
Less: noncurrent inventories | 4,349,009 | 4,865,181
Current inventories, net | $ 1,082,325 | $ 876,436

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