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Net Income (Loss) Per Share - Antidilutive Shares (Details) - shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total (in shares) 59,071,453 52,305,473
Common and preferred stock warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total (in shares) 0 3,635,181
Common stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total (in shares) 39,273,376 48,670,292
Performance stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total (in shares) 16,146,630 0
Restricted stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total (in shares) 3,651,447 0