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Net Loss Per Share Attributable to Common Stockholders - 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
Mar. 31, 2021
Mar. 31, 2020
Numerator    
Net loss attributable to common stockholders $ (55,993) $ (38,503)
Denominator    
Weighted-average common shares outstanding used to calculate net loss per share attributable to common stockholders, basic and diluted 90,044,082 86,588,796
Net loss per share attributable to common stockholders, basic and diluted $ (0.62) $ (0.44)