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Redeemable Convertible Preferred Stock - Series A redeemable convertible preferred stock (Details) - USD ($)
shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Temporary Equity [Line Items]    
Beginning balance (in shares) 7,687 7,687
Beginning balance $ 68.8 $ 68.8
Repurchase of Series A redeemable convertible preferred stock (in shares) (102) 0
Repurchase of Series A redeemable convertible preferred stock $ (2.1) $ 0.0
Ending balance (in shares) 0 7,687
Ending balance $ 0.0 $ 68.8
Conversion of Series A redeemable convertible preferred stock to Class A common stock    
Temporary Equity [Line Items]    
Conversion of Series A redeemable convertible preferred stock to Class A common stock (in shares) (58) 0
Conversion of Series A redeemable convertible preferred stock to Class A common stock $ (0.5) $ 0.0
Conversion of Series A redeemable convertible preferred stock to Class A common stock upon initial public offering    
Temporary Equity [Line Items]    
Conversion of Series A redeemable convertible preferred stock to Class A common stock (in shares) (7,527) 0
Conversion of Series A redeemable convertible preferred stock to Class A common stock $ (66.2) $ 0.0