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Inventories - Inventories (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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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

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