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Nature of Business and Summary of Significant Accounting Policies - Summary of Sales by Geographic Area (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Sales by geographic area | $ 2,923,148 | $ 2,878,059 | $ 8,020,927 | $ 8,913,122
United States of America [Member] |  |  |  |
Sales by geographic area | 2,854,501 | 2,787,618 | 7,846,560 | 8,612,552
Foreign [Member] |  |  |  |
Sales by geographic area | $ 68,647 | $ 90,441 | $ 174,367 | $ 300,570

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