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Unaudited Condensed Statement of Stockholders' Equity - 9 months ended Sep. 30, 2018 - USD ($) | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive Loss | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 46,224,979 | $ 961 | $ 89,907,766 | $ (1,257,100) | $ (16,907) | $ (42,409,741)
Beginning balance, shares at Dec. 31, 2017 |  | 9,481,992 |  |  |  |
Stock-based compensation | 2,536,132 |  | 2,536,132 |  |  |
Exercise of stock options | $ 616,501 | $ 30 | 616,471 |  |  |
Exercise of stock options, shares | 297,719 | 297,719 |  |  |  |
Common stock repurchases | $ (1,836,874) |  |  | (1,836,874) |  |
Common stock repurchases, shares |  | (193,523) |  |  |  |
Unrealized gain (loss) on available-for-sale securities, net of tax | 10,473 |  |  |  | 10,473 |
Net loss | (3,858,879) |  |  |  |  | (3,858,879)
Ending balance at Sep. 30, 2018 | $ 43,692,332 | $ 991 | $ 93,060,369 | $ (3,093,974) | $ (6,434) | $ (46,268,620)
Ending balance, shares at Sep. 30, 2018 |  | 9,586,188 |  |  |  |

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