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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' DEFICIT - USD ($) | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Stock Options and Warrants | Stock Options and Warrants Common Stock | Stock Options and Warrants Additional Paid-in Capital | Restricted Stock Units (RSUs) | Restricted Stock Units (RSUs) Common Stock | Restricted Stock Units (RSUs) Additional Paid-in Capital | Stock Options | Stock Options Common Stock | Stock Options Additional Paid-in Capital | RSUs and Stock-Settled Appreciation Rights Common Stock | RSUs and Stock-Settled Appreciation Rights Additional Paid-in Capital
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Total stockholders' equity (in shares) at Dec. 31, 2014 |  | 53,504,296 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholders' equity at Dec. 31, 2014 | $ (246,502,477) | $ 5,351 | $ 175,483,180 | $ (421,991,008) | $ 0 |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | (39,451,324) |  |  | (39,451,324) |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options and warrants (in shares) |  |  |  |  |  |  | 610,000 |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options and warrants |  |  |  |  |  | $ 12,200 | $ 60 | $ 12,140 |  |  |  |  |  |  |  |
Stock-based compensation | 1,528,582 |  | 1,528,582 |  |  |  |  |  |  |  |  |  |  |  |  |
Change in excess tax benefit stock-based compensation, value | (15,531) |  | (15,531) |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of common stock tendered for employee stock-based compensation tax obligations | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholders' equity (in shares) at Dec. 31, 2015 | 78,692,912 | 54,114,296 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholders' equity at Dec. 31, 2015 | $ (284,428,550) | $ 5,411 | 177,008,371 | (461,442,332) | 0 |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | (39,697,960) |  |  | (39,697,960) |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options and warrants (in shares) |  |  |  |  |  |  |  |  |  | (483,335) |  |  |  |  |  |
Issuance of common stock upon exercise of stock options and warrants |  |  |  |  |  |  |  |  | $ 0 | $ 48 | $ (48) |  |  |  |  |
Stock-based compensation | 775,541 |  | 775,541 |  |  |  |  |  |  |  |  |  |  |  |  |
Change in excess tax benefit stock-based compensation, value | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of common stock tendered for employee stock-based compensation tax obligations (in shares) |  | (136,744) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of common stock tendered for employee stock-based compensation tax obligations | (428,009) | $ (13) | (427,996) |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock associated with rights offering, shares |  | 23,523,195 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock associated with rights offering, value | 34,596,469 | $ 2,352 | 34,594,117 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock associated with backstop agreement, shares |  | 708,530 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock associated with backstop agreement, value | 1,764,240 | $ 71 | 1,764,169 |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholders' equity (in shares) at Dec. 31, 2016 |  | 78,692,612 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholders' equity at Dec. 31, 2016 | (287,418,269) | $ 7,869 | 213,714,154 | (501,140,292) | 0 |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | (36,235,484) |  |  | (36,235,484) |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options and warrants (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | (33,870) |  | 466,328 |
Issuance of common stock upon exercise of stock options and warrants |  |  |  |  |  |  |  |  |  |  |  | $ 89,498 | $ 3 | $ 89,495 | $ 47 | $ (47)
Stock-based compensation | 1,101,031 |  | 1,101,031 |  |  |  |  |  |  |  |  |  |  |  |  |
Change in excess tax benefit stock-based compensation, value | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of common stock tendered for employee stock-based compensation tax obligations (in shares) |  | (153,810) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of common stock tendered for employee stock-based compensation tax obligations | $ (591,067) | $ (15) | (591,052) |  |  |  |  |  |  |  |  |  |  |  |  |
Buy-back of stock options |  |  | (84,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholders' equity (in shares) at Dec. 31, 2017 | 78,692,912 | 79,039,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholders' equity at Dec. 31, 2017 | $ (323,138,291) | $ 7,904 | $ 214,229,581 | $ (537,375,776) | $ 0 |  |  |  |  |  |  |  |  |  |  |

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