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Share-Based Compensation - Textual (Details)
6 Months Ended
Jun. 02, 2017
shares
Jun. 30, 2019
USD ($)
plan
$ / shares
shares
Jun. 30, 2018
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of plans | plan   5  
Share-based compensation expense   $ 294,000 $ 184,000
Unrecognized compensation cost related to non-vested share-based compensation arrangements   $ 0  
Granted (in shares) | shares   0 0
Nonvested and expected to vest (in shares) | shares   64,096  
Employee Stock Purchase Plan (ESPP)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Offering period 3 months    
Discount from market price 10.00%    
Shares reserved for plan (in shares) | shares 500,000    
Shares available for grant (in shares) | shares   478,510  
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payroll deductions 1.00%    
Minimum | 2005 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   1 year  
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payroll deductions 15.00%    
Maximum | 2005 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   5 years  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Tax benefit of stock option compensation expense   $ 25,000 $ 139,000
Restricted Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to non-vested share-based compensation arrangements   $ 798,000  
Granted (in dollars per share) | $ / shares   $ 19.77  
Weighted average remaining period   1 year 9 months 60 days  
Intrinsic value   $ 1,805,000