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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, 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 |  |  |
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 |  |  |
Stock-based compensation expense (employees and directors) |  | 186,707 |  | 186,707
Exercise of stock options | $ 594 | 686,927 |  | 687,521
Exercise of stock options, shares | 593,838 |  |  |
Vesting of restricted stock | $ 36 | (36) |  |
Vesting of restricted stock, shares | 35,681 |  |  |
Net loss |  |  | (3,963,576) | (3,963,576)
Balance at Dec. 31, 2018 | $ 15,639 | $ 127,290,467 | $ (114,386,401) | $ 12,919,705
Balance, shares at Dec. 31, 2018 | 15,638,765 |  |  |

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