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STOCKHOLDERS' EQUITY, Common Stock (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 03, 2021
Feb. 03, 2021
Aug. 05, 2020
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Common Stock [Abstract]                  
Common stock, shares authorized (in shares)             300,000,000   300,000,000
Common stock, par value (in dollars per share)             $ 0.0001   $ 0.0001
Common stock, shares outstanding (in shares)             196,776,871   195,813,817
Warrants outstanding (in shares)             49,951,243    
Common stock, available for issuance (in shares)             53,271,886    
Common stock issuable under agreement       $ 8,213,602 $ 17,189,560 $ 41,912,515      
Net proceeds from issuance of common stock             $ 0 $ 67,315,677  
Sale Agreement [Member] | Jefferies LLC [Member] | Maximum [Member]                  
Common Stock [Abstract]                  
Common stock issuable under agreement     $ 50,000,000            
Sale Agreement, Amended [Member] | Jefferies LLC [Member] | Maximum [Member]                  
Common Stock [Abstract]                  
Common stock issuable under agreement   $ 105,400,000              
Distribution Agreement [Member] | Raymond James & Associates Inc. [Member]                  
Common Stock [Abstract]                  
Common stock issuable under agreement             $ 42,800,000    
Common stock shares sold during the period (in shares)             0    
Distribution Agreement [Member] | Raymond James & Associates Inc. [Member] | Maximum [Member]                  
Common Stock [Abstract]                  
Common stock issuable under agreement $ 50,000,000                
Common Stock [Member]                  
Common Stock [Abstract]                  
Warrants outstanding (in shares)             13,556,898   4,528,160
Common stock issuable under agreement       $ 644 $ 883 $ 1,808      
Common stock shares sold during the period (in shares)       6,438,276 8,827,045 18,080,708      
Common Stock [Member] | Sale Agreement [Member] | Jefferies LLC [Member]                  
Common Stock [Abstract]                  
Common stock shares sold during the period (in shares)               27,805,198  
Net proceeds from issuance of common stock               $ 60,400,000  
Common Stock [Member] | Distribution Agreement [Member] | Raymond James & Associates Inc. [Member]                  
Common Stock [Abstract]                  
Common stock shares sold during the period (in shares)               5,540,831  
Net proceeds from issuance of common stock               $ 6,900,000