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NET LOSS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Numerator [Abstract]                  
Net loss $ (18,091) $ (35,697) $ (11,779) $ (8,557) $ (8,197) $ (10,314)   $ (65,567) $ (27,068)
Numerator for basic EPS - loss attributable to common stockholders (18,091)     (8,557)       (65,567) (27,068)
Numerator for diluted EPS - loss attributable to common stockholders $ (18,091)     $ (8,557)       $ (65,567) $ (27,068)
Denominator [Abstract]                  
Common stock (in shares) 136,456,848     5,360,497       60,104,891 5,350,771
Denominator for basic EPS - weighted-average common stock (in shares) 136,456,848     5,360,497       60,104,891 5,350,771
Denominator for diluted EPS - weighted-average common stock (in shares) 136,456,848     5,360,497       60,104,891 5,350,771
Basic net loss per share (in dollars per share) $ (0.13)     $ (1.60)       $ (1.09) $ (5.06)
Diluted net loss per share (in dollars per share) $ (0.13)     $ (1.60)       $ (1.09) $ (5.06)
Net Loss per Share [Abstract]                  
Anti-dilutive common equivalent shares (in shares) 16,955,811     76,663,455       16,955,811 76,663,455
Outstanding Convertible Preferred Stock (Series A through E) [Member]                  
Net Loss per Share [Abstract]                  
Anti-dilutive common equivalent shares (in shares) 0     68,684,758       0 68,684,758
Misstatement in Basic and Diluted Net Loss per Share Calculation [Member]                  
Denominator [Abstract]                  
Common stock (in shares)   36,890,502         21,296,162    
Denominator for basic EPS - weighted-average common stock (in shares)   36,890,502         21,296,162    
Denominator for diluted EPS - weighted-average common stock (in shares)   36,890,502         21,296,162    
Basic net loss per share (in dollars per share)   $ (0.97)         $ (2.23)    
Diluted net loss per share (in dollars per share)   $ (0.97)         $ (2.23)    
Misstatement in Basic and Diluted Net Loss per Share Calculation [Member] | Previously Reported [Member]                  
Denominator [Abstract]                  
Common stock (in shares)   11,696,084         8,629,355    
Denominator for basic EPS - weighted-average common stock (in shares)   11,696,084         8,629,355    
Denominator for diluted EPS - weighted-average common stock (in shares)   11,696,084         8,629,355    
Basic net loss per share (in dollars per share)   $ (3.05)         $ (5.50)    
Diluted net loss per share (in dollars per share)   $ (3.05)         $ (5.50)    
Outstanding Options to Purchase Common Stock [Member]                  
Net Loss per Share [Abstract]                  
Anti-dilutive common equivalent shares (in shares) 8,126,177     7,978,697       8,126,177 7,978,697
Outstanding Restricted Stock Units [Member]                  
Net Loss per Share [Abstract]                  
Anti-dilutive common equivalent shares (in shares) 4,861,315     0       4,861,315 0
Outstanding Warrants [Member]                  
Net Loss per Share [Abstract]                  
Anti-dilutive common equivalent shares (in shares) 3,968,319     0       3,968,319 0