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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Antidilutive Shares (Details) - shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) 41,550,044 31,608,816
Common stock warrants    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) 12,517,328 12,517,328
Series X Convertible Preferred stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) 18,184,720 10,442,780
Common stock options, RSUs and PRSUs issued and outstanding    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) 10,847,996 8,648,708