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NET LOSS PER SHARE - Anti-dilutive Securities (Details) - shares
3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Antidilutive securities (in shares) 46,405,617 53,425,800 51,165,310
Warrants      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Antidilutive securities (in shares) 366,982 413,040 396,270
Weighted-average stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Antidilutive securities (in shares) 9,419,506 10,981,370 8,737,650
Convertible preferred stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share      
Antidilutive securities (in shares) 36,619,129 42,031,390 42,031,390