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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) | Total | Common Stock | Additional Paid in Capital | Accumulated Deficit | Treasury Stock
--- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2017 |  | 28,618,580 |  |  |
Beginning Balance at Dec. 31, 2017 | $ 14,087,342 | $ 28,996 | $ 136,033,967 | $ (120,579,062) | $ (1,396,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (1,408,024) |  |  | (1,408,024) |
Stock-based compensation | 377,847 |  | 377,847 |  |
Stock issued for vested restricted stock awards (in shares) |  | 178,618 |  |  |
Stock issued for vested restricted stock awards | 0 | $ 178 | (178) |  |
Ending Balance (in shares) at Mar. 31, 2018 |  | 28,797,198 |  |  |
Ending Balance at Mar. 31, 2018 | 13,057,165 | $ 29,174 | 136,411,636 | (121,987,086) | (1,396,559)
Beginning Balance (in shares) at Dec. 31, 2018 |  | 32,381,290 |  |  |
Beginning Balance at Dec. 31, 2018 | 11,033,815 | $ 32,759 | 138,867,509 | (126,469,894) | (1,396,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (2,462,393) |  |  |  |
Stock-based compensation | 96,871 |  | 96,871 |  |
Stock issued for vested restricted stock awards (in shares) |  | 186,031 |  |  |
Stock issued for vested restricted stock awards | 0 | $ 186 | (186) |  |
Ending Balance (in shares) at Mar. 31, 2019 |  | 32,567,321 |  |  |
Ending Balance at Mar. 31, 2019 | $ 8,668,293 | $ 32,945 | $ 138,964,194 | $ (128,932,287) | $ (1,396,559)

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