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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
Common Stock
Additional Paid in Capital
Accumulated Deficit
Total
Beginning balance at Dec. 31, 2017 $ 216,430 $ 516,351,405 $ (386,659,120) $ 129,908,715
Beginning balance (in shares) at Dec. 31, 2017 216,429,642      
Shares issued for exercise of options, net $ 154 43,902   44,056
Shares issued for exercise of options, net (in shares) 154,632      
Share-based compensation   1,751,358   1,751,358
Net loss     (24,401,829) (24,401,829)
Ending balance at Mar. 31, 2018 $ 216,584 518,146,665 (411,060,949) 107,302,300
Ending balance (in shares) at Mar. 31, 2018 216,584,274      
Beginning balance at Dec. 31, 2017 $ 216,430 516,351,405 (386,659,120) 129,908,715
Beginning balance (in shares) at Dec. 31, 2017 216,429,642      
Net loss       (57,620,877)
Ending balance at Jun. 30, 2018 $ 216,834 521,608,436 (444,279,997) 77,545,273
Ending balance (in shares) at Jun. 30, 2018 216,834,059      
Beginning balance at Mar. 31, 2018 $ 216,584 518,146,665 (411,060,949) 107,302,300
Beginning balance (in shares) at Mar. 31, 2018 216,584,274      
Shares issued for exercise of options, net $ 250 1,084,689   1,084,939
Shares issued for exercise of options, net (in shares) 249,785      
Share-based compensation   2,377,082   2,377,082
Net loss     (33,219,048) (33,219,048)
Ending balance at Jun. 30, 2018 $ 216,834 521,608,436 (444,279,997) 77,545,273
Ending balance (in shares) at Jun. 30, 2018 216,834,059      
Beginning balance at Dec. 31, 2018 $ 240,463 616,559,938 (519,276,280) $ 97,524,121
Beginning balance (in shares) at Dec. 31, 2018 240,462,439     240,462,439
Shares issued for exercise of options and warrants, net $ 759 99,348   $ 100,107
Shares issued for exercise of options and warrants, net (in shares) 759,401      
Share-based compensation   2,575,369   2,575,369
Net loss     (39,506,375) (39,506,375)
Ending balance at Mar. 31, 2019 $ 241,222 619,234,655 (558,782,655) 60,693,222
Ending balance (in shares) at Mar. 31, 2019 241,221,840      
Beginning balance at Dec. 31, 2018 $ 240,463 616,559,938 (519,276,280) $ 97,524,121
Beginning balance (in shares) at Dec. 31, 2018 240,462,439     240,462,439
Shares issued for exercise of options, net       $ 100,107
Net loss       (94,742,892)
Ending balance at Jun. 30, 2019 $ 241,222 621,871,919 (614,019,172) $ 8,093,969
Ending balance (in shares) at Jun. 30, 2019 241,221,840     241,221,840
Beginning balance at Mar. 31, 2019 $ 241,222 619,234,655 (558,782,655) $ 60,693,222
Beginning balance (in shares) at Mar. 31, 2019 241,221,840      
Share-based compensation   2,637,264   2,637,264
Net loss     (55,236,517) (55,236,517)
Ending balance at Jun. 30, 2019 $ 241,222 $ 621,871,919 $ (614,019,172) $ 8,093,969
Ending balance (in shares) at Jun. 30, 2019 241,221,840     241,221,840