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Share-Based Compensation - Textual (Details)
3 Months Ended
Jun. 02, 2017
shares
Mar. 31, 2021
USD ($)
plan
$ / shares
shares
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of plans | plan   4    
Share-based compensation expense | $   $ 101,000 $ 121,000  
Unrecognized compensation cost related to non-vested share-based compensation arrangements | $   $ 0    
Granted (in shares) | shares   0 0  
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   453,549    
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 | $   $ 1,000 $ (72,000)  
Restricted Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) | shares   10,529    
Unrecognized compensation cost related to non-vested share-based compensation arrangements | $   $ 126,000    
Granted (in dollars per share) | $ / shares   $ 14.98    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares   27,788   30,013
Weighted average remaining period   9 months 21 days    
Intrinsic value | $   $ 2,761,000    
Restricted Common Stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   1 year    
Restricted Common Stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   5 years