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Share-Based Compensation - Textual (Details)
3 Months Ended 9 Months Ended
Jun. 02, 2017
shares
Sep. 30, 2017
USD ($)
plan
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
plan
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of plans | plan   3   3  
Share-based compensation expense   $ 77,000 $ 89,000 $ 310,000 $ 196,000
Unrecognized compensation cost related to non-vested share-based compensation arrangements   $ 0   0  
Other than options vested       $ 46,000 $ 51,000
Granted (in shares) | shares       0 0
Nonvested and expected to vest (in shares) | shares       64,538  
Employee Stock Purchase Plan (ESPP)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Offering period 6 months        
Discount from market price 10.00%        
Shares reserved for plan (in shares) | shares 500,000        
Shares available for grant (in shares) | shares   500,000   500,000  
2005 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period       5 years  
Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payroll deductions 1.00%        
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payroll deductions 15.00%        
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Tax benefit of stock option compensation expense   $ 0 $ 10,000 $ 102,000 $ 38,000
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   736,000   $ 736,000  
Granted (in shares) | shares       0 54,650
Granted (in dollars per share) | $ / shares       $ 0.00 $ 14.10
Weighted average remaining period       2 years 12 months 22 days  
Intrinsic value   $ 1,439,000   $ 1,439,000  
Restricted Common Stock | Annual Vesting          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percent       20.00%