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v3.19.3.a.u2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | ---
Beginning balance, value at Dec. 31, 2016 | $ 196,688 | $ 436,995,052 | $ (309,702,319) | $ 127,489,421
Beginning balance (in shares) at Dec. 31, 2016 | 196,688,222 |  |  |
Shares issued in offerings, net of cost | $ 12,400 | 68,560,235 |  | 68,572,635
Shares issued in offerings, net of cost (in shares) | 12,400,000 |  |  |
Shares issued for exercise of options, net | $ 103 | 212,512 |  | $ 212,615
Shares issued for exercise of options, net (in shares) | 102,546 |  |  | 102,546
Shares issued for exercise of warrants, net | $ 7,239 | 3,791,760 |  | $ 3,798,999
Shares issued for exercise of warrants, net (in shares) | 7,238,874 |  |  |
Share-based compensation |  | 6,760,425 |  | 6,760,425
Adoption of ASU 2016-09 at Dec. 31, 2016 |  | 31,421 | (31,421) |
Net loss |  |  | (76,925,380) | (76,925,380)
Ending balance, value at Dec. 31, 2017 | $ 216,430 | 516,351,405 | (386,659,120) | 129,908,715
Ending balance (in shares) at Dec. 31, 2017 | 216,429,642 |  |  |
Shares issued in offerings, net of cost | $ 18,578 | 89,889,219 |  | 89,907,797
Shares issued in offerings, net of cost (in shares) | 18,578,430 |  |  |
Shares issued for exercise of options, net | $ 5,455 | 1,660,753 |  | 1,666,208
Shares issued for exercise of options, net (in shares) | 5,454,367 |  |  |
Share-based compensation |  | 8,658,561 |  | 8,658,561
Net loss |  |  | (132,617,160) | (132,617,160)
Ending balance, value at Dec. 31, 2018 | $ 240,463 | 616,559,938 | (519,276,280) | $ 97,524,121
Ending balance (in shares) at Dec. 31, 2018 | 240,462,439 |  |  | 240,462,439
Shares issued in offerings, net of cost | $ 29,900 | 77,001,358 |  | $ 77,031,258
Shares issued in offerings, net of cost (in shares) | 29,900,000 |  |  |
Share-based compensation |  | 10,682,084 |  | 10,682,084
Net loss |  |  | (176,144,999) | (176,144,999)
Shares issued for exercise of options and warrants, net | $ 814 | 107,842 |  | 108,656
Shares issued for exercise of options and warrants, net (in shares) | 814,637 |  |  |
Ending balance, value at Dec. 31, 2019 | $ 271,177 | $ 704,351,222 | $ (695,421,279) | $ 9,201,120
Ending balance (in shares) at Dec. 31, 2019 | 271,177,076 |  |  | 271,177,076

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