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CONVERTIBLE PREFERRED STOCK - Future Tranche Right (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 06, 2021
Oct. 31, 2021
Apr. 30, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Jan. 31, 2021
May 07, 2020
Subsidiary, Sale of Stock [Line Items]                
Future tranche right, fair value               $ 3,400
Carrying value of preferred stock   $ 436,321     $ 436,321   $ 205,469  
Change in fair value of future tranche right   $ 0   $ 9,224 $ (15,810) $ 22,834    
Series A Preferred Stock                
Subsidiary, Sale of Stock [Line Items]                
Carrying value of preferred stock               $ 203,400
Series B Preferred Stock                
Subsidiary, Sale of Stock [Line Items]                
Carrying value of preferred stock $ 237,000              
Change in fair value of future tranche right     $ 15,800          
Future tranche right $ 37,000              
Series B Preferred Stock | Series B Private Placement                
Subsidiary, Sale of Stock [Line Items]                
Sale of stock, number of shares issued (in shares) 200,000