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Stockholders' Equity - Nonqualified Cash Plan and Equity Incentive Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Stockholders' Equity    
Deferred compensation investment $ 4.8 $ 4.1
Expiration period 10 years  
Vesting percentage 100.00%  
Maximum | Options to purchase common stock    
Stockholders' Equity    
Number of shares reserved for issuance (in shares) 18,322,154  
First Anniversary    
Stockholders' Equity    
Monthly vesting percentage 2.08%  
Vesting percentage 25.00%