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Stockholders' Equity - Equity‑based Compensation (Details) - USD ($)
1 Months Ended
Jun. 30, 2019
Apr. 30, 2018
2019 Incentive Plan    
Equity‑based Compensation    
Vesting period 1 year  
Grant date fair value $ 4,511,120  
2019 Incentive Plan | Tranche 1    
Equity‑based Compensation    
Vesting percentage 50.00%  
2019 Incentive Plan | Tranche 2    
Equity‑based Compensation    
Vesting percentage 50.00%  
2018 Incentive Plan    
Equity‑based Compensation    
Grant date fair value   $ 5,344,500
2018 Incentive Plan | Tranche 1    
Equity‑based Compensation    
Vesting percentage   50.00%
2018 Incentive Plan | Tranche 2    
Equity‑based Compensation    
Vesting percentage   25.00%