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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 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:            
Net loss attributable to common stockholders $ (100,216) $ (82,553) $ (18,981) $ (17,471) $ (182,769) $ (36,452)
Less: Deemed dividend 0   0   0 (9,484)
Net loss attributable to common stockholders, basic (100,216)   (18,981)   (182,769) (45,936)
Net loss attributable to common stockholders, diluted $ (100,216)   $ (18,981)   $ (182,769) $ (45,936)
Denominator:            
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares) 100,611,965   39,801,379   70,684,750 40,209,877
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares) 100,611,965   39,801,379   70,684,750 40,209,877
Net loss per share attributable to common shareholders, basic (in dollars per share) $ (1.00)   $ (0.48)   $ (2.59) $ (1.14)
Net loss per share attributable to common shareholders, diluted (in dollars per share) $ (1.00)   $ (0.48)   $ (2.59) $ (1.14)