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Net Loss Per Share - Schedule of Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator        
Net loss attributable to common stockholders $ (43,305) $ (25,274) $ (124,489) $ (78,726)
Denominator        
Weighted-average common shares outstanding used to calculate net loss per share attributable to common stockholders, basic and diluted 87,869,321 84,634,956 87,176,677 34,556,485
Net loss per share attributable to common stockholders, basic and diluted $ (0.49) $ (0.30) $ (1.43) $ (2.28)