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Condensed Consolidated Statements of Changes in Stockholders' (Deficit) Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Accumulated Deficit [Member]
Total
Balance at Dec. 31, 2019 $ 109 $ 739,956 $ (234) $ (701,216) $ 38,615
Balance (in shares) at Dec. 31, 2019 109,425,243   41,309    
Issuance of common stock in connection with exercise of options   80     80
Issuance of common stock in connection with exercise of options 19,750        
Issuance of restricted stock $ 1 (1)      
Issuance of restricted stock (in shares) 774,300        
Forfeiture of restricted stock (in shares) (10,000)        
Compensation in respect of restricted stock granted to employees, directors and consultants   11,068     11,068
Net loss       (51,116) (51,116)
Balance at Mar. 31, 2020 $ 110 751,103 $ (234) (752,332) (1,353)
Balance (in shares) at Mar. 31, 2020 110,209,293   41,309    
Balance at Dec. 31, 2019 $ 109 739,956 $ (234) (701,216) 38,615
Balance (in shares) at Dec. 31, 2019 109,425,243   41,309    
Net loss         (191,163)
Balance at Sep. 30, 2020 $ 129 1,063,142 $ (234) (892,379) 170,658
Balance (in shares) at Sep. 30, 2020 128,959,861   41,309    
Balance at Mar. 31, 2020 $ 110 751,103 $ (234) (752,332) (1,353)
Balance (in shares) at Mar. 31, 2020 110,209,293   41,309    
Issuance of common stock in connection with exercise of options   16     16
Issuance of common stock in connection with exercise of options 3,750        
Issuance of restricted stock $ 2 (2)      
Issuance of restricted stock (in shares) 2,208,529        
Forfeiture of restricted stock (in shares) (41,666)        
Issuance of common stock in public offering $ 10 165,032     165,042
Issuance of common stock in public offering (in shares) 9,775,000        
Issuance of common stock in At-the-Market offerings (net of offering costs) $ 5 76,031     76,036
Issuance of common stock in At-the-Market offerings (net of offering costs) (in shares) 4,535,608        
Compensation in respect of restricted stock granted to employees, directors and consultants   7,370     7,370
Net loss       (52,884) (52,884)
Balance at Jun. 30, 2020 $ 127 999,550 $ (234) (805,216) 194,227
Balance (in shares) at Jun. 30, 2020 126,690,514   41,309    
Issuance of common stock in connection with exercise of options   38     38
Issuance of common stock in connection with exercise of options 9,347        
Issuance of restricted stock $ 1 (1)      
Issuance of restricted stock (in shares) 915,000        
Forfeiture of restricted stock (in shares) (65,000)        
Offering costs paid         10,900
Issuance of common stock in public offering   (1)     (1)
Issuance of common stock in At-the-Market offerings (net of offering costs) $ 1 35,226     35,227
Issuance of common stock in At-the-Market offerings (net of offering costs) (in shares) 1,410,000        
Compensation in respect of restricted stock granted to employees, directors and consultants   28,330     28,330
Net loss       (87,163) (87,163)
Balance at Sep. 30, 2020 $ 129 1,063,142 $ (234) (892,379) 170,658
Balance (in shares) at Sep. 30, 2020 128,959,861   41,309    
Balance at Dec. 31, 2020 $ 141 1,500,040 $ (234) (980,597) 519,350
Balance (in shares) at Dec. 31, 2020 140,617,606   41,309    
Issuance of common stock in connection with exercise of options   128     128
Issuance of common stock in connection with exercise of options 31,245        
Issuance of restricted stock $ 1 (1)      
Issuance of restricted stock (in shares) 893,488        
Forfeiture of restricted stock (in shares) (21,643)        
Offering costs paid   (183)     (183)
Compensation in respect of restricted stock granted to employees, directors and consultants   16,618     16,618
Net loss       (90,628) (90,628)
Balance at Mar. 31, 2021 $ 142 1,516,602 $ (234) (1,071,225) 445,285
Balance (in shares) at Mar. 31, 2021 141,520,696   41,309    
Balance at Dec. 31, 2020 $ 141 1,500,040 $ (234) (980,597) 519,350
Balance (in shares) at Dec. 31, 2020 140,617,606   41,309    
Net loss         (254,763)
Balance at Sep. 30, 2021 $ 143 1,546,967 $ (234) (1,235,359) 311,517
Balance (in shares) at Sep. 30, 2021 142,984,448   41,309    
Balance at Mar. 31, 2021 $ 142 1,516,602 $ (234) (1,071,225) 445,285
Balance (in shares) at Mar. 31, 2021 141,520,696   41,309    
Issuance of common stock in connection with exercise of options   38     38
Issuance of common stock in connection with exercise of options (9,364)        
Issuance of restricted stock $ 1 (1)      
Issuance of restricted stock (in shares) 1,356,151        
Forfeiture of restricted stock (in shares) (12,416)        
Offering costs paid         10,900
Compensation in respect of restricted stock granted to employees, directors and consultants   16,304     16,304
Net loss       (78,497) (78,497)
Balance at Jun. 30, 2021 $ 143 1,532,943 $ (234) (1,149,722) 383,130
Balance (in shares) at Jun. 30, 2021 142,873,795   41,309    
Issuance of common stock in connection with exercise of options   50     50
Issuance of common stock in connection with exercise of options (12,085)        
Forfeiture of restricted stock (in shares) (115,655)        
Offering costs paid   (22)     (22)
Issuance of common stock in At-the-Market offerings (net of offering costs) (in shares) 214,223        
Compensation in respect of restricted stock granted to employees, directors and consultants   13,996     13,996
Net loss       (85,637) (85,637)
Balance at Sep. 30, 2021 $ 143 $ 1,546,967 $ (234) $ (1,235,359) $ 311,517
Balance (in shares) at Sep. 30, 2021 142,984,448   41,309