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Earnings (Loss) per Share - Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Share (Details)
shares in Millions
6 Months Ended
Jun. 30, 2020
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Anti-dilutive securities (in shares) 42
Stock options  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Anti-dilutive securities (in shares) 40
Restricted common stock units  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Anti-dilutive securities (in shares) 2