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Stock-Based Compensation (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Stock-Based Compensation |  |  |  |
Total stock-based compensation expense | $ 468,436 | $ 442,081 | $ 850,789 | $ 858,408
Cost of revenue |  |  |  |
Stock-Based Compensation |  |  |  |
Total stock-based compensation expense | 58,319 | 69,239 | 120,843 | 137,498
General and administrative |  |  |  |
Stock-Based Compensation |  |  |  |
Total stock-based compensation expense | 303,375 | 256,466 | 523,080 | 483,237
Sales and marketing |  |  |  |
Stock-Based Compensation |  |  |  |
Total stock-based compensation expense | 87,168 | 78,277 | 169,299 | 161,893
Research and development |  |  |  |
Stock-Based Compensation |  |  |  |
Total stock-based compensation expense | $ 19,574 | $ 38,099 | $ 37,567 | $ 75,780

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