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Share-Based Payments (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 30, 2020
Installment
$ / shares
shares
Jan. 23, 2019
Installment
$ / shares
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation | $     $ 400,000 $ 600,000 $ 900,000 $ 1,300,000  
Unrecognized share-based compensation | $     $ 1,700,000   $ 1,700,000   $ 1,200,000
Weighted average remaining amortization period of unamortized share based compensation         2 years   9 months 18 days
Co-Chief Executive Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options granted (in shares) 60,000            
Weighted average grant date fair value of options granted (usd per share) | $ / shares $ 10.61            
Options exercise price (usd per share) | $ / shares $ 13.11            
Co-Chief Executive Officer | Restricted stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of restricted stock granted (in shares) 60,000            
Weighted average grant date fair value of market based restricted stock granted (usd per share) | $ / shares $ 13.11            
Number of annual installments | Installment 4            
Management | Restricted stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of restricted stock granted (in shares)   60,329          
Weighted average grant date fair value of market based restricted stock granted (usd per share) | $ / shares   $ 26.68          
Number of annual installments | Installment   3          
Director | Restricted stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Value of restricted stock granted to directors annually | $         $ 60,000    
Required service period for restricted stock         1 year    
Director attendance requirement         75.00%    
Tranche one | Co-Chief Executive Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options expected to vest (in shares) 40,000            
Performance goal percentage 400.00%            
Tranche one, First Performance Goal | Co-Chief Executive Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options expected to vest (in shares) 13,333            
Tranche one, second and third allotment | Co-Chief Executive Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options expected to vest (in shares) 26,667            
Tranche two | Co-Chief Executive Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options expected to vest (in shares) 20,000            
Performance goal percentage 800.00%            
Tranche two, Second Performance Goal | Co-Chief Executive Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options expected to vest (in shares) 6,666            
Tranche two, second and third allotment | Co-Chief Executive Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options expected to vest (in shares) 13,334