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Equity-based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Oct. 01, 2018
Apr. 02, 2018
Jul. 21, 2015
Nov. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restricted Stock Units                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Restricted stock granted     258,375 395,250 276,451   277,500    
Restricted stock cancelled       258,375          
Stock units granted, new grantees       277,500          
Equity-based compensation expense         $ 3,700 $ 1,700 $ 117    
Remaining expense related to unvested restricted stock units         $ 5,300        
Expense recognition period         27 months        
Number of shares outstanding, non-vested         275,744 672,750 672,750 672,750 258,375
Fair value per unit at weighted average grant date, non-vested         $ 26.49 $ 5.14 $ 5.14 $ 13.43  
Plan                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Common stock shares available for grant         7,500,000        
Shares of common stock remain available for future grants         7,224,256        
2018 Employee Stock Purchase Plan | Restricted Stock Units                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Restricted stock granted   270,105              
Additional Restricted stock granted 6,346                
2018 Employee Stock Purchase Plan | Restricted Stock Units | Half of Units Granted                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Vesting period, options   3 years              
2018 Employee Stock Purchase Plan | Restricted Stock Units | Remaining Half of Units Granted                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Vesting period, options   3 years              
Award vesting rights         The remaining half of the restricted stock units vest equally on March 31 of each of the next three years.        
2018 Employee Stock Purchase Plan | Restricted Stock Units | Minimum [Member] | Half of Units Granted                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Award vesting rights, percentage   0.00%              
2018 Employee Stock Purchase Plan | Restricted Stock Units | Maximum | Half of Units Granted                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Award vesting rights, percentage   200.00%