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Statements of Stockholders' Equity (Deficit) - USD ($) | Total | Preferred Convertible Stock | Common Stock | Additional Paid-in Capital | Note to Employee | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2013 | $ (39,505,672) | $ 5,968,549 | $ 1,016,783 |  |  | $ (46,491,004)
Beginning balance, shares at Dec. 31, 2013 |  | 6,244,174 | 380,566 |  |  |
Stock-based compensation | 657,730 |  |  | $ 657,730 |  |
Shares issued pursuant to stock awards, shares |  |  | 244,616 |  |  |
Exercise of stock options | $ 220 |  | $ 220 |  |  |
Exercise of stock options, shares | 100 |  | 100 |  |  |
Change in note to employee | $ (266,282) |  |  |  | $ (266,282) |
Effect of accretion to redemption value | (2,144,434) |  |  | (657,730) |  | (1,486,704)
Net income (loss) | 3,588,300 |  |  |  |  | 3,588,300
Ending balance at Dec. 31, 2014 | (37,670,138) | $ 5,968,549 | $ 1,017,003 |  | (266,282) | (44,389,408)
Ending balance, shares at Dec. 31, 2014 |  | 6,244,174 | 625,282 |  |  |
Stock-based compensation | 341,554 |  |  | 341,554 |  |
Shares issued pursuant to stock awards, shares |  |  | 16,300 |  |  |
Exercise of stock options | $ 77,372 |  | $ 77,372 |  |  |
Exercise of stock options, shares | 24,260 |  | 24,260 |  |  |
Change in note to employee | $ 266,282 |  |  |  | $ 266,282 |
Effect of accretion to redemption value | (2,157,550) |  |  | (341,554) |  | (1,815,996)
Net income (loss) | (270,342) |  |  |  |  | (270,342)
Ending balance at Dec. 31, 2015 | (39,412,822) | $ 5,968,549 | $ 1,094,375 |  |  | (46,475,746)
Ending balance, shares at Dec. 31, 2015 |  | 6,244,174 | 665,842 |  |  |
Stock-based compensation | 298,535 |  |  | 298,535 |  |
Conversion of warrants | 249,215 |  |  | 249,215 |  |
Conversion of warrants, shares |  |  | 127,143 |  |  |
Exercise of stock options | $ 137,403 |  | $ 112,101 | 25,302 |  |
Exercise of stock options, shares | 58,155 |  | 58,155 |  |  |
Effect of accretion to redemption value | $ (1,356,707) |  |  | (547,750) |  | (808,957)
Change in par value from no par value to $0.0001 |  |  | $ (1,206,391) | 1,206,391 |  |
Issuance of common stock upon initial public offering, net of issuance costs | 10,816,978 |  | $ 170 | 10,816,808 |  |
Issuance of common stock upon initial public offering, net of issuance costs, shares |  |  | 1,700,100 |  |  |
Issuance of warrants to underwriters | 126,218 |  |  | 126,218 |  |
Conversion of preferred redeemable convertible stock to common stock upon initial public offering | 44,463,613 |  | $ 378 | 44,463,235 |  |
Conversion of preferred redeemable convertible stock to common stock upon initial public offering, shares |  |  | 3,778,753 |  |  |
Conversion of preferred convertible stock to common stock upon initial public offering |  | $ (5,968,549) | $ 126 | 5,968,423 |  |
Conversion of preferred convertible stock to common stock upon initial public offering, shares |  | (6,244,174) | 1,259,187 |  |  |
Issuance of common stock upon secondary public offering, net of issuance costs | 25,976,262 |  | $ 169 | 25,976,093 |  |
Issuance of common stock upon secondary public offering, net of issuance costs, shares |  |  | 1,685,882 |  |  |
Net income (loss) | 3,733,707 |  |  |  |  | 3,733,707
Ending balance at Dec. 31, 2016 | $ 45,032,402 |  | $ 928 | $ 88,582,470 |  | $ (43,550,996)
Ending balance, shares at Dec. 31, 2016 |  |  | 9,275,062 |  |  |

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