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Equity-based Compensation - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 15, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Conversion of options to purchase common stock, description   1:1 basis      
Dividend yield   0.00%      
Stock option granted   67,232      
Weighted average grant date fair value of options granted   $ 15.62      
Excess tax benefits in relation to equity-based compensation   $ 600,000 $ 0 $ 0  
General and Administrative Expense          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Equity-based compensation cost   $ 2,100,000 1,400,000 $ 900,000  
Class A Common Stock | Restricted Stock Units (RSUs)          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Restricted stock unit granted   13,130      
Weighted average grant date fair value granted   $ 19.04      
2013 Equity Incentive Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Equity incentive plans award term   10 year      
Equity incentive plans vesting period   5 years      
Incremental equity-based compensation expense     $ 0    
Stock option granted   67,232      
2013 Equity Incentive Plan | Stock Option          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Total unrecognized compensation cost   $ 5,900,000      
Total unrecognized compensation cost to be recognized, weighted average service period   3 years 9 months 18 days      
Amendment to 2013 Equity Incentive Plan | Common Class A Unit | Maximum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of shares available for issuance         6,207,978
2019 Equity Incentive Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Increase in number of shares reserved for future issuance, description   The number of shares that will be available for issuance under our 2019 Plan also will increase annually on the first day of each year beginning in 2020, in an amount equal to the least of: (1) 6,900,000 shares, (2) 5% of the outstanding shares of all classes of our common stock as of the last day of the immediately preceding year and (3) such other amount as our board of directors may determine      
Increase in number of shares reserved for future issuance, shares 6,900,000        
Percentage of number of shares of common stock outstanding 5.00%        
2019 Equity Incentive Plan | Restricted Stock Units (RSUs)          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Total unrecognized compensation cost   $ 5,900,000      
Total unrecognized compensation cost to be recognized, weighted average service period   3 years 9 months 18 days      
2019 Equity Incentive Plan | Class A Common Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common stock reserved for issuance 4,500,000 4,500,000      
2019 Equity Incentive Plan | Class A Common Stock | Restricted Stock Units (RSUs)          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Restricted stock unit granted   13,130      
Weighted average grant date fair value granted   $ 19.04