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Consolidated Statements of Stockholders' Equity - USD ($) | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 9,879 | $ 114,950,278 | $ (98,633,745) | $ 16,326,412
Balance, shares at Dec. 31, 2015 | 9,878,906 |  |  |
Stock-based compensation expense (employees and directors) |  | 935,899 |  | 935,899
Issuance of common stock, net of costs | $ 1,200 | 1,776,750 |  | 1,777,950
Issuance of common stock, net of costs, shares | 1,200,000 |  |  |
Purchase and retirement of common stock | $ (979) | (1,095,629) |  | (1,096,608)
Purchase and retirement of common stock, shares | (979,114) |  |  |
Exercise of stock options | $ 345 | 389,534 |  | 389,879
Exercise of stock options, shares | 345,127 |  |  |
Exercise of warrants | $ 153 | 336,447 |  | 336,600
Exercise of warrants, shares | 153,000 |  |  |
Vesting of restricted stock | $ 121 | (121) |  |
Vesting of restricted stock, shares | 120,634 |  |  |
Net loss |  |  | (5,734,681) | (5,734,681)
Balance at Dec. 31, 2016 | $ 10,719 | 117,293,158 | (104,368,426) | 12,935,451
Balance, shares at Dec. 31, 2016 | 10,718,553 |  |  |
Cumulative adjustment upon modified retrospective adoption of ASU 2016-09 at Dec. 31, 2017 |  | 33,894 | (33,894) |
Balance after adoption of recent accounting pronouncement at Dec. 31, 2016 | 10,719 | 117,327,052 | (104,402,320) | 12,935,451
Balance after adoption of recent accounting pronouncement, shares at Dec. 31, 2016 | 10,718,553 |  |  |
Stock-based compensation expense (employees and directors) |  | 435,679 |  | 435,679
Issuance of common stock, net of costs | $ 4,169 | 8,508,692 |  | 8,512,861
Issuance of common stock, net of costs, shares | 4,168,750 |  |  |
Purchase and retirement of common stock |  |  |  | (1,096,608)
Exercise of stock options | $ 10 | 10,090 |  | 10,100
Exercise of stock options, shares | 10,000 |  |  |
Exercise of warrants | $ 63 | 139,637 |  | 139,700
Exercise of warrants, shares | 63,500 |  |  |
Vesting of restricted stock | $ 50 | (50) |  |
Vesting of restricted stock, shares | 50,207 |  |  |
Shares forfeited in exchange for payment of withholding taxes | $ (2) | (4,231) |  | (4,233)
Shares forfeited in exchange for payment of withholding taxes, shares | (1,764) |  |  |
Net loss |  |  | (6,020,505) | (6,020,505)
Balance at Dec. 31, 2017 | $ 15,009 | $ 126,416,869 | $ (110,422,825) | $ 16,009,053
Balance, shares at Dec. 31, 2017 | 15,009,246 |  |  |

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