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Equity Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Options Outstanding    
Options Outstanding, Beginning balance 5,890,540  
Options Outstanding, Options granted 1,122,100  
Options Outstanding, Options exercised (165,488)  
Options Outstanding, Options forfeited (37,542)  
Options Outstanding, Ending balance 6,809,610 5,890,540
Options Outstanding, Options exercisable 3,349,241  
Options Outstanding, Options vested and expected to vest 6,809,610  
Weighted-Average Exercise Price Per Share    
Weighted-Average Exercise Price Per Share, Beginning balance $ 17.66  
Weighted-Average Exercise Price Per Share, Options granted 28.85  
Weighted-Average Exercise Price Per Share, Options exercised 11.68  
Weighted-Average Exercise Price Per Share, Options forfeited 39.04  
Weighted-Average Exercise Price Per Share, Ending balance 19.53 $ 17.66
Weighted-Average Exercise Price Per Share, Options exercisable 13.59  
Weighted-Average Exercise Price Per Share, Options vested and expected to vest $ 19.53  
Weighted-Average Remaining Contractual Life (years)    
Weighted-Average Remaining Contractual Life (years) 7 years 4 months 13 days  
Weighted-Average Remaining Contractual Life (years), Options exercisable 6 years 18 days  
Weighted-Average Remaining Contractual Life (years), Options vested and expected to vest 7 years 4 months 13 days 7 years 5 months 19 days
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Options Outstanding $ 46.0 $ 102.7
Aggregate Intrinsic Value, Options exercisable 34.5  
Aggregate Intrinsic Value, Options vested and expected to vest $ 46.0  
Options, weighted-average grant-date fair value $ 22.56