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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Beginning balance, value at Dec. 31, 2017 $ 216,430 $ 516,351,405 $ (386,659,120) $ 129,908,715
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2017 216,429,642      
Shares issued for exercise of options, net $ 154 43,902 44,056
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 154,632      
Share-based compensation 1,751,358 1,751,358
Net loss (24,401,829) (24,401,829)
Common Stock, Shares, Outstanding, Ending Balance at Mar. 31, 2018 216,584,274      
Ending balance, value at Mar. 31, 2018 $ 216,584 518,146,665 (411,060,949) 107,302,300
Beginning balance, value at Dec. 31, 2017 $ 216,430 516,351,405 (386,659,120) 129,908,715
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2017 216,429,642      
Shares issued for exercise of options, net       $ 1,236,313
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       1,446,876
Net loss       $ (93,226,179)
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2018 236,464,789      
Ending balance, value at Sep. 30, 2018 $ 236,465 613,864,115 (479,885,299) 134,215,281
Beginning balance, value at Mar. 31, 2018 $ 216,584 518,146,665 (411,060,949) 107,302,300
Common Stock, Shares, Outstanding, Beginning Balance at Mar. 31, 2018 216,584,274      
Shares issued for exercise of options, net $ 250 1,084,689 1,084,939
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 249,785      
Share-based compensation 2,377,082 2,377,082
Net loss (33,219,048) (33,219,048)
Common Stock, Shares, Outstanding, Ending Balance at Jun. 30, 2018 216,834,059      
Ending balance, value at Jun. 30, 2018 $ 216,834 521,608,436 (444,279,997) 77,545,273
Shares issued for exercise of options, net $ 1,053 106,265 $ 107,318
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 1,052,300     1,052,300
Share-based compensation 2,260,195 $ 2,260,195
Net loss (35,605,302) (35,605,302)
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2018 236,464,789      
Shares issued in offering, net $ 18,578 89,889,219 89,907,797
Stock Issued During Period, Shares, New Issues 18,578,430      
Ending balance, value at Sep. 30, 2018 $ 236,465 613,864,115 (479,885,299) 134,215,281
Beginning balance, value at Dec. 31, 2018 $ 240,463 616,559,938 (519,276,280) $ 97,524,121
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2018 240,462,439     240,462,439
Share-based compensation 2,575,369 $ 2,575,369
Net loss (39,506,375) (39,506,375)
Common Stock, Shares, Outstanding, Ending Balance at Mar. 31, 2019 241,221,840      
Shares issued for exercise of options and warrants, net $ 759 99,348 100,107
Stock Issued During Period, Shares, Other 759,401      
Ending balance, value at Mar. 31, 2019 $ 241,222 619,234,655 (558,782,655) 60,693,222
Beginning balance, value at Dec. 31, 2018 $ 240,463 616,559,938 (519,276,280) $ 97,524,121
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2018 240,462,439     240,462,439
Shares issued for exercise of options, net       $ 108,656
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       331,619
Net loss       $ (126,709,485)
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2019 241,277,076     241,277,076
Ending balance, value at Sep. 30, 2019 $ 241,277 624,515,559 (645,985,765) $ (21,228,929)
Beginning balance, value at Mar. 31, 2019 $ 241,222 619,234,655 (558,782,655) 60,693,222
Common Stock, Shares, Outstanding, Beginning Balance at Mar. 31, 2019 241,221,840      
Share-based compensation 2,637,264 2,637,264
Net loss (55,236,517) (55,236,517)
Common Stock, Shares, Outstanding, Ending Balance at Jun. 30, 2019 241,221,840      
Ending balance, value at Jun. 30, 2019 $ 241,222 621,871,919 (614,019,172) 8,093,969
Shares issued for exercise of options, net $ 55 8,494 $ 8,549
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 55,236     55,236
Share-based compensation   2,635,146 $ 2,635,146
Net loss (31,966,593) $ (31,966,593)
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2019 241,277,076     241,277,076
Ending balance, value at Sep. 30, 2019 $ 241,277 $ 624,515,559 $ (645,985,765) $ (21,228,929)