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Share-Based Compensation - Restricted Common Stock Awards (Details) - Restricted Common Stock
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Shares  
Nonvested outstanding shares beginning balance (in shares) | shares 63,768
Granted (in shares) | shares 22,204
Vested (in shares) | shares (20,733)
Forfeited (in shares) | shares (1,685)
Nonvested outstanding shares ending balance (in shares) | shares 63,554
Weighted Average Grant-Date Fair Value  
Nonvested outstanding shares beginning balance (in dollars per share) | $ / shares $ 13.33
Granted (in dollars per share) | $ / shares 20.76
Vested (in dollars per share) | $ / shares 13.09
Forfeited (in dollars per share) | $ / shares 14.39
Nonvested outstanding shares ending balance (in dollars per share) | $ / shares $ 15.98