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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Total
Retained Earnings [Member]
Beginning balance, shares at Dec. 31, 2018 240,462,439      
Beginning balance, value at Dec. 31, 2018 $ 240,463 $ 616,559,938 $ 97,524,121 $ (519,276,280)
Shares issued for exercise of options and warrants, net (in shares) 759,401      
Shares issued for exercise of options and warrants, net $ 759 99,348 100,107  
Share-based compensation   2,575,369 2,575,369  
Net loss     (39,506,375) (39,506,375)
Ending balance, shares at Mar. 31, 2019 241,221,840      
Ending balance, value at Mar. 31, 2019 $ 241,222 619,234,655 60,693,222 (558,782,655)
Beginning balance, shares at Dec. 31, 2018 240,462,439      
Beginning balance, value at Dec. 31, 2018 $ 240,463 616,559,938 97,524,121 (519,276,280)
Net loss     (94,742,892)  
Ending balance, shares at Jun. 30, 2019 241,221,840      
Ending balance, value at Jun. 30, 2019 $ 241,222 621,871,919 $ 8,093,969 (614,019,172)
Shares issued for exercise of options, net (in shares)     276,383  
Shares issued for exercise of options, net     $ 100,107  
Beginning balance, shares at Mar. 31, 2019 241,221,840      
Beginning balance, value at Mar. 31, 2019 $ 241,222 619,234,655 60,693,222 (558,782,655)
Share-based compensation   2,637,264 2,637,264  
Net loss     (55,236,517) (55,236,517)
Ending balance, shares at Jun. 30, 2019 241,221,840      
Ending balance, value at Jun. 30, 2019 $ 241,222 621,871,919 $ 8,093,969 (614,019,172)
Beginning balance, shares at Dec. 31, 2019 271,177,076   271,177,076  
Beginning balance, value at Dec. 31, 2019 $ 271,177 704,351,222 $ 9,201,120 (695,421,279)
Share-based compensation   2,366,453 2,366,453  
Net loss     (56,848,802) (56,848,802)
Ending balance, shares at Mar. 31, 2020 271,677,742      
Ending balance, value at Mar. 31, 2020 $ 271,678 706,789,283 (45,209,120) (752,270,081)
Shares issued for exercise of options, net (in shares) 350,666      
Shares issued for exercise of options, net $ 351 71,758 $ 72,109  
Issuance of shares from release of restricted stock (in shares) 150,000      
Issuance of shares from release of restricted stock $ 150 (150)    
Beginning balance, shares at Dec. 31, 2019 271,177,076   271,177,076  
Beginning balance, value at Dec. 31, 2019 $ 271,177 704,351,222 $ 9,201,120 (695,421,279)
Net loss     $ (108,825,466)  
Ending balance, shares at Jun. 30, 2020 272,294,380   272,294,380  
Ending balance, value at Jun. 30, 2020 $ 272,294 709,885,568 $ (94,088,883) (804,246,745)
Shares issued for exercise of options, net (in shares)     664,304  
Shares issued for exercise of options, net     $ 166,184  
Beginning balance, shares at Mar. 31, 2020 271,677,742      
Beginning balance, value at Mar. 31, 2020 $ 271,678 706,789,283 (45,209,120) (752,270,081)
Share-based compensation   3,002,826 3,002,826  
Net loss     $ (51,976,664) (51,976,664)
Ending balance, shares at Jun. 30, 2020 272,294,380   272,294,380  
Ending balance, value at Jun. 30, 2020 $ 272,294 709,885,568 $ (94,088,883) $ (804,246,745)
Shares issued for exercise of options, net (in shares) 313,638   313,638  
Shares issued for exercise of options, net $ 313 93,762 $ 94,075  
Issuance of shares from release of restricted stock (in shares) 303,000      
Issuance of shares from release of restricted stock $ 303 $ (303)