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Equity-Based Compensation - Stock Options (Details) - Stock options
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Number of Units    
Outstanding, beginning (in shares) | shares 1,627,947  
Granted (in shares) | shares 843,235  
Exercised (in shares) | shares (14,866)  
Cancelled (in shares) | shares (32,755)  
Outstanding, end (in shares) | shares 2,423,561 1,627,947
Options exercisable, end (in shares) | shares 489,347  
Weighted Average Exercise Price    
Outstanding, beginning (in dollars per share) $ 10.86  
Granted (in dollars per share) 16.11  
Exercised (in dollars per share) 6.23  
Cancelled (in dollars per share) 13.91  
Outstanding, end (in dollars per share) 12.68 $ 10.86
Options exercisable, end (in dollars per share) $ 10.40  
Stock options    
Weighted average remaining contractual term 9 years 29 days 9 years 3 months 4 days
Weighted average remaining contractual term, exercisable 8 years 8 months 27 days  
Aggregate intrinsic value, beginning | $ $ 19,831  
Aggregate intrinsic value, end | $ 10,568 $ 19,831
Aggregate intrinsic value, exercisable | $ $ 2,994  
Weighted average grant date fair value (in dollars per share) $ 11.33