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Consolidated Statements of Stockholders' Equity - USD ($) | Series B Convertible Preferred Stock [Member] | Series C Convertible Preferred Stock [Member] | Series D Convertible Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at December 31, 2014 (in shares) at Dec. 31, 2014 | 100 |  |  | 31,950,813 |  |  |
Balance at December 31, 2014 at Dec. 31, 2014 | $ 76,095 |  |  | $ 31,951 | $ 30,823,769 | $ (29,785,640) | $ 1,146,175
Sale of convertible preferred stock for cash (in shares) |  | 3,000 |  |  |  |  |
Sale of convertible preferred stock for cash |  | $ 983,941 |  |  | 1,695,869 |  | 2,679,810
Stock-based compensation expense |  |  |  |  | 67,905 |  | 67,905
Net loss |  |  |  |  |  | (2,689,287) | (2,689,287)
Balance at December 31, 2015 (in shares) at Dec. 31, 2015 | 100 | 3,000 |  | 31,950,813 |  |  |
Balance at December 31, 2015 at Dec. 31, 2015 | $ 76,095 | $ 983,941 |  | $ 31,951 | 32,587,543 | (32,474,927) | 1,204,603
Stock-based compensation expense |  |  |  |  | 967,667 |  | 967,667
Net loss |  |  |  |  |  | (3,271,701) | (3,271,701)
Balance at December 31, 2015 (in shares) at Dec. 31, 2016 | 100 | 2,868 |  | 55,235,233 |  |  |
Balance at December 31, 2015 at Dec. 31, 2016 | $ 76,095 | $ 940,705 |  | $ 55,235 | 34,914,963 | (35,746,628) | 240,370
Conversion of preferred stock to common stock (in shares) |  | (132) |  | 1,400,000 |  |  |
Conversion of preferred stock to common stock |  | $ (43,236) |  | $ 1,400 | 41,836 |  |
Sale of common stock for cash upon warrant exercise (in shares) |  |  |  | 21,884,420 |  |  |
Sale of common stock for cash upon warrant exercise |  |  |  | $ 21,884 | 1,317,917 |  | 1,339,801
Sale of convertible preferred stock for cash (in shares) |  |  | 1,000 |  |  |  |
Sale of convertible preferred stock for cash |  |  | $ 980,000 |  |  |  | 980,000
Stock-based compensation expense |  |  |  |  | 57,224 |  | 57,224
Net loss |  |  |  |  |  | (2,170,162) | (2,170,162)
Balance at December 31, 2015 (in shares) at Dec. 31, 2017 | 100 | 2,570 | 1,000 | 106,736,810 |  |  |
Balance at December 31, 2015 at Dec. 31, 2017 | $ 76,095 | $ 842,990 | $ 980,000 | $ 106,737 | 35,589,911 | $ (37,916,790) | (321,057)
Conversion of preferred stock to common stock (in shares) |  | (298) |  | 19,862,000 |  |  |
Conversion of preferred stock to common stock |  | $ (97,715) |  | $ 19,862 | 77,853 |  |
Sale of common stock for cash upon warrant exercise (in shares) |  |  |  | 31,639,577 |  |  |
Sale of common stock for cash upon warrant exercise |  |  |  | $ 31,640 | $ 539,871 |  | $ 571,511

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