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Net Loss Per Share - Additional Information (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net Loss Per Share        
Anti-dilutive securities not included in computation of diluted net loss per share attributable to common stockholders 9.6 10.5 10.4 10.2