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Net Loss Per Share - Securities Excluded From Computation of Diluted Net Loss Per Common Share (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of diluted net loss per common share (in shares) 6.8 5.6 6.8 5.6
Stock options        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of diluted net loss per common share (in shares) 6.5 5.4 6.5 5.4
Restricted stock awards        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of diluted net loss per common share (in shares) 0.0 0.1 0.0 0.1
Restricted stock units        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of diluted net loss per common share (in shares) 0.3 0.1 0.3 0.1