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NET LOSS PER SHARE - Basic and diluted net loss per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Numerator:        
Net loss attributable to common stockholders $ (82,553) $ (17,471) $ (156,124) $ (59,414)
Less: Deemed dividend to preferred stockholders   (9,484)    
Net loss attributable to common stockholders $ (82,553) $ (26,955) $ (165,608) $ (64,767)
Denominator:        
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted 12,263,160 9,075,646 9,474,749 10,703,380
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares) 12,263,160   9,075,646  
Net loss per share attributable to common stockholders, basic and diluted $ (6.73) $ (2.97) $ (17.48) $ (6.05)
Net loss per share attributable to common shareholders, basic (in dollars per share) (6.73) $ (2.97)    
Net loss per share attributable to common shareholders, diluted (in dollars per share) $ (6.73)   $ (2.97)