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Stock-Based Incentive Compensation Plans - Restricted Stock Unit Activity (Details) - Restricted Stock Units - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Number of Shares    
Unvested, beginning balance (in shares) 0  
Granted (in shares) 54,036  
Forfeited (in shares) (600)  
Vested (in shares) 0 0
Unvested, ending balance (in shares) 53,436 0
Weighted- Average Grant Date Fair Value    
Unvested, beginning balance (in dollars per share) $ 0.00  
Granted (in dollars per share) 11.79  
Forfeited (in dollars per share) 20.60  
Vested (in dollars per share) 0.00  
Unvested, ending balance (in dollars per share) $ 11.69 $ 0.00