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Equity-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Nov. 22, 2019
Nov. 14, 2019
Dec. 31, 2019
Mar. 31, 2020
Oct. 22, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock options issued to holders of units, weighted average exercise price $ 16.89        
Stock options weighted average grant date fair value $ 8.06        
Non-cash equity-based compensation expense over the requisite service period $ 6.6        
Unamortized value of outstanding stock-based compensation       $ 45.0  
Unamortized value of outstanding stock-based compensation, weighted average remaining life       2 years 1 month 6 days  
ESPP          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common stock shares available for sale         1,100,000
Common stock shares issued   172,000      
Nonforfeitable Restricted Stock Units (RSUs)          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Issued shares of common stock 194,000        
Weighted average exercise price $ 16.89        
Vesting period 2 years        
Vesting terms       first anniversary of the grant date  
Non-cash equity-based compensation expense over the requisite service period     $ 3.3    
Restricted Stock Units (RSUs)          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Issued shares of common stock 454,000        
Weighted average exercise price $ 16.89        
Vesting period 4 years        
Non-cash equity-based compensation expense over the requisite service period $ 6.8        
Stock Options          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Vesting period 4 years        
Stock options issued to holders of units 953,000