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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Stock-Based Compensation |
Schedule of stock-based compensation |
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
|  | (unaudited) |  | (unaudited)
Cost of revenue |  | $ | 58,319 |  | $ | 69,239 |  | $ | 120,843 |  | $ | 137,498
General and administrative |  |  | 303,375 |  |  | 256,466 |  |  | 523,080 |  |  | 483,237
Sales and marketing |  |  | 87,168 |  |  | 78,277 |  |  | 169,299 |  |  | 161,893
Research and development |  |  | 19,574 |  |  | 38,099 |  |  | 37,567 |  |  | 75,780
Total |  | $ | 468,436 |  | $ | 442,081 |  | $ | 850,789 |  | $ | 858,408
Summary of stock options and restricted stock units activity | The following table presents a summary of our stock-based compensation activity for the six months ended June 30, 2019 (shares):
|  | Stock |  | Restricted
|  | Options |  | Stock Units
Outstanding beginning of period |  | 1,129,463 |  | 226,501
Awards granted |  | — |  | 8,780
Awards exercised/vested |  | (179,638) |  | (32,964)
Awards canceled |  | (750) |  | (13,246)
Outstanding end of period |  | 949,075 |  | 189,071

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