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Share-Based Compensation - Restricted Common Stock Awards (Details) - Restricted Common Stock
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Shares  
Nonvested outstanding shares beginning balance (in shares) | shares 63,529
Granted (in shares) | shares 5,295
Vested (in shares) | shares (10,907)
Forfeited (in shares) | shares (90)
Nonvested outstanding shares ending balance (in shares) | shares 57,827
Weighted Average Grant-Date Fair Value  
Nonvested outstanding shares beginning balance (in dollars per share) | $ / shares $ 15.98
Granted (in dollars per share) | $ / shares 18.91
Vested (in dollars per share) | $ / shares 15.05
Forfeited (in dollars per share) | $ / shares 12.95
Nonvested outstanding shares ending balance (in dollars per share) | $ / shares $ 16.43