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Stock-Based Compensation Expense and Employee Benefit Plans - Employee Stock Purchase Plan (Details) - 2018 ESPP - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee stock ownership plan (ESOP), compensation expense $ 6.9 $ 2.2  
Number of shares issued (in shares) 420,689 977,508  
Number of additional shares authorized (in shares) 2,055,792 1,902,572  
Number of common stock reserved for issuance (in shares) 4,179,771 3,512,465  
Unrecognized stock-based compensation cost $ 6.4   $ 9.8
Expense expected to be recognized over a weighted-average period 1 year 2 months 12 days 6 months