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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Antidilutive Shares (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 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) 22,558,661 33,316,375 40,788,887 33,316,375
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 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) 0 10,442,780 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) 10,041,333 10,356,267 10,086,839 10,356,267