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Stock-Based Compensation - Narrative (Details) - 2013 Equity Incentive Plan - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2016
May 08, 2014
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Sep. 18, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense     $ 166,000 $ 199,000 $ 358,000 $ 393,000    
Stock option, fair value assumption, expected life             7 years 4 months 10 days  
Remaining weighted-average vesting period         6 years 10 months 8 days      
Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized (in shares)               324,013
Market price per share (in dollars per share)   $ 16.89            
Award vesting period   5 years            
Annual award vesting percentage   20.00%            
Award contractual life   10 years            
Expiration period   10 years            
Stock option, fair value assumption, expected life   6 years 6 months            
Unrecognized compensation cost, nonvested awards     425,000   $ 425,000      
Remaining weighted-average vesting period         1 year 11 months      
Restricted stock awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized (in shares)               129,605
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 4,500 125,105            
Market price per share (in dollars per share) $ 26.00 $ 16.89            
Award vesting period   5 years            
Unrecognized compensation cost, nonvested awards     $ 589,000   $ 589,000      
Weighted-average vesting period         1 year 9 months      
Restricted stock awards | Director                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period   3 years