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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 6 Months Ended
Jun. 30, 2023
Number of Shares  
Balance at the beginning of the period (in shares) 19,064
Options, granted (in shares) 5,194
Options, exercised (in shares) (655)
Options, forfeited (in shares) (160)
Options, expired (in shares) (35)
Balance at the end of the period (in shares) 23,408
Vested and unvested expected to vest as of the end of the period (in shares) 21,510
Exercisable at the end of the period (in shares) 13,061
Weighted Average Exercise  Price  
Balance at the beginning of the period (in dollars per share) $ 11.31
Options, granted (in dollars per share) 11.97
Options, exercised (in dollars per share) 6.73
Options, forfeited (in dollars per share) 11.36
Options, expired (in dollars per share) 13.99
Balance at the end of the period (in dollars per share) 11.58
Vested and unvested expected to vest as of the end of the period (in dollars per share) 11.52
Exercisable at the end of the period (in dollars per share) $ 11.02
Additional Disclosures  
Balance at the end of the period 6 years 10 months 24 days
Vested and unvested expected to vest at the end of the period 6 years 8 months 12 days
Exercisable at the end of the period 5 years 3 months 18 days
Aggregate intrinsic value, options outstanding $ 41.1
Aggregate intrinsic value, vested and unvested expected to vest 39.3
Aggregate intrinsic value of options exercisable $ 32.5