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Share-Based Compensation - Restricted Common Stock Awards (Details) - Restricted Common Stock - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Shares      
Nonvested outstanding shares beginning balance (in shares)   63,768  
Granted (in shares) 20,488 21,490 21,490
Vested (in shares)   (5,405)  
Forfeited (in shares)   (1,580)  
Nonvested outstanding shares ending balance (in shares) 78,273 78,273  
Weighted Average Grant-Date Fair Value      
Nonvested outstanding shares beginning balance (in dollars per share)   $ 13.33  
Granted (in dollars per share)   20.75  
Vested (in dollars per share)   11.10  
Forfeited (in dollars per share)   14.49  
Nonvested outstanding shares ending balance (in dollars per share) $ 15.50 $ 15.50