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Net Loss Per Share - Narrative (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Anti-dilutive securities not included in computation of diluted net loss per share 13.8 11.5 13.4 11.7