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Employee Benefits - 401(k) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
401(k) Savings Plan      
Annual vesting percentage of Company matching contribution 25.00%    
Vesting period 4 years    
Expense related to the matching contributions to the 401(k) plan $ 3.9 $ 0.9 $ 0.8
First 3% of employee contributions      
401(k) Savings Plan      
Employer contribution subject to first 4% of the participant's compensation (as a percent) 100.00%    
First 3% of employee contributions | Maximum      
401(k) Savings Plan      
Participant's compensation for 25% contribution (as a percent) 3.00%    
Next 2% of employee contributions      
401(k) Savings Plan      
Employer contribution subject to first 4% of the participant's compensation (as a percent) 50.00%    
Next 2% of employee contributions | Minimum      
401(k) Savings Plan      
Participant's compensation for 25% contribution (as a percent) 3.00%    
Next 2% of employee contributions | Maximum      
401(k) Savings Plan      
Participant's compensation for 25% contribution (as a percent) 4.00%