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Stock-Based Compensation - Stock-based compensation expense (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock-Based Compensation |  |  |
Total stock-based compensation expense | $ 1,854,965 | $ 1,764,319 | $ 2,454,363
Cost of revenue |  |  |
Stock-Based Compensation |  |  |
Total stock-based compensation expense | 256,924 | 279,221 | 214,325
General and administrative |  |  |
Stock-Based Compensation |  |  |
Total stock-based compensation expense | 1,167,161 | 1,000,002 | 1,670,015
Sales and marketing |  |  |
Stock-Based Compensation |  |  |
Total stock-based compensation expense | 348,603 | 329,644 | 441,931
Research and development |  |  |
Stock-Based Compensation |  |  |
Total stock-based compensation expense | $ 82,277 | $ 155,452 | $ 128,092

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