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Equity - Changes in Stockholders' Equity (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Total Stockholders' Equity | $ 103,454,467 | $ 102,914,687 | $ (341,317,730) | $ 102,914,687 | $ (323,138,291) |
Total Stockholders' Equity (shares) |  | 80,763,350 |  | 80,763,350 |  |
Net (loss)/income | (1,205,827) |  | 388,050,413 | $ (2,738,542) | 369,416,894 |
Issuance of common stock upon exercise of stock options |  |  | 252,679 | 0 | 252,679 |
Issuance of common stock upon vesting of RSUs and exercise of stock-settled appreciation rights |  |  | 0 | 0 | 0 |
Issuance of common stock upon exercise of warrants | 0 |  | 6,007,847 | 1,172,801 | 6,007,847 |
Issuance of common stock |  |  |  | 0 |  |
Payment of common stock tendered for employee stock-based compensation tax obligations | (143,220) |  | (1,695,962) | (199,810) | (1,708,290) |
Cumulative effect of accounting change |  |  |  |  |  | $ (223,313)
Stock-based compensation | $ 761,096 |  | 1,176,558 | $ 1,717,380 | 1,866,279 |
Total Stockholders' Equity (shares) | 81,074,280 |  |  | 81,074,280 |  |
Total Stockholders' Equity | $ 102,866,516 |  | 52,473,805 | $ 102,866,516 | 52,473,805 |
Common Stock |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Total Stockholders' Equity | $ 8,105 | $ 8,076 | $ 7,916 | $ 8,076 | $ 7,904 |
Total Stockholders' Equity (shares) | 81,046,524 | 80,763,350 | 79,160,058 | 80,763,350 | 79,039,000 |
Issuance of common stock upon exercise of stock options (shares) |  |  | 395,663 | 9,769 | 408,698 |
Issuance of common stock upon exercise of stock options |  |  | $ 39 | $ 1 | $ 41 |
Issuance of common stock upon vesting of RSUs and exercise of stock-settled appreciation rights (shares) |  |  | 227,287 | 121,771 | 337,084 |
Issuance of common stock upon vesting of RSUs and exercise of stock-settled appreciation rights |  |  | $ 23 | $ 12 | $ 33 |
Issuance of common stock upon exercise of warrants (shares) | 53,332 |  | 760,625 | 159,782 | 760,625 |
Issuance of common stock upon exercise of warrants | $ 5 |  | $ 76 | $ 16 | $ 76 |
Issuance of common stock (shares) |  |  |  | 53,332 |  |
Issuance of common stock |  |  |  | $ 5 |  |
Payment of common stock tendered for employee stock-based compensation tax obligations (shares) | (25,576) |  | (223,098) | (33,724) | (224,872) |
Payment of common stock tendered for employee stock-based compensation tax obligations | $ (3) |  | $ (22) | $ (3) | $ (22) |
Total Stockholders' Equity (shares) | 81,074,280 |  | 80,320,535 | 81,074,280 | 80,320,535 |
Total Stockholders' Equity | $ 8,107 |  | $ 8,032 | $ 8,107 | $ 8,032 |
Additional Paid-in Capital |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Total Stockholders' Equity | 220,770,338 | $ 218,697,872 | 214,906,962 | 218,697,872 | 214,229,581 |
Issuance of common stock upon exercise of stock options |  |  | 252,640 | (1) | 252,638 |
Issuance of common stock upon vesting of RSUs and exercise of stock-settled appreciation rights |  |  | (23) | (12) | (33) |
Issuance of common stock upon exercise of warrants | (5) |  | 6,007,771 | 1,172,785 | 6,007,771 |
Issuance of common stock |  |  |  | (5) |  |
Payment of common stock tendered for employee stock-based compensation tax obligations | (143,217) |  | (1,695,940) | (199,807) | (1,708,268) |
Stock-based compensation | 761,096 |  | 1,176,558 | 1,717,380 | 1,866,279 |
Total Stockholders' Equity | 221,388,212 |  | 220,647,968 | 221,388,212 | 220,647,968 |
Accumulated Deficit |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Total Stockholders' Equity | (117,323,976) | (115,791,261) | (556,232,608) | (115,791,261) | (537,375,776) |
Net (loss)/income | (1,205,827) |  | 388,050,413 |  | 369,416,894 |
Cumulative effect of accounting change |  |  |  |  |  | $ (223,313)
Stock-based compensation |  | 0 | 0 | 0 | 0 |
Total Stockholders' Equity | (118,529,803) |  | (168,182,195) | (118,529,803) | (168,182,195) |
Other Comprehensive Income |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Total Stockholders' Equity | 0 | 0 | 0 | 0 | 0 |
Stock-based compensation |  | $ 0 | 0 | 0 | 0 |
Total Stockholders' Equity | $ 0 |  | $ 0 | $ 0 | $ 0 |

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