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Stock-Based Compensation - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense | $ $ 0.2      
2019 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (shares) 4,118,055 4,118,055 4,118,055 4,118,055
Granted (shares)       693,454
Canceled (shares)       0
Vested (shares)       0
Number of shares available for future awards (shares) 3,424,601 3,424,601 3,424,601 3,424,601
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (shares)   324,979    
Canceled (shares)   0    
Vested (shares)   0    
Unamortized compensation cost | $ $ 3.1 $ 3.1 $ 3.1 $ 3.1
Stock based compensation expense | $     0.1  
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (years)       3 years
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (years)       2 years
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Tranche Three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (years)       1 year
Performance Based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (shares)   424,031    
Canceled (shares)   0    
Vesting period (years)       4 years
Unamortized compensation cost | $ $ 5.5 $ 5.5 5.5 $ 5.5
Stock based compensation expense | $     $ 0.1  
Performance period (years)       1 year
Minimum | Performance Based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Targeted performance goal expressed as percentage of growth in performance level attained       0.00%
Maximum | Performance Based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Targeted performance goal expressed as percentage of growth in performance level attained       150.00%