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Stock-Based Compensation - Summary of Restricted Stock Awards (Details) - Restricted Stock Award - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Shares    
Unvested, beginning balance (shares) 422,911 286,068
Granted (shares) 287,982 254,534
Vested (shares) (191,287) (111,024)
Forfeited (shares) (334) (6,667)
Unvested, ending balance (shares) 519,272 422,911
Weighted Average Share Price    
Unvested, beginning balance (usd per share) $ 14.19 $ 12.63
Granted (usd per share) 15.25 15.46
Vested (usd per share) 14.39 12.82
Forfeited (usd per share) 15.21 15.21
Unvested, ending balance (usd per share) $ 14.69 $ 14.19