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Share-Based Payments (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 30, 2020
Installment
$ / shares
shares
Jan. 23, 2019
Installment
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Sep. 11, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation | $     $ 300,000 $ 600,000 $ 1,200,000 $ 1,900,000    
Unrecognized share-based compensation | $     $ 1,400,000   $ 1,400,000   $ 1,200,000  
Weighted average remaining amortization period of unamortized share based compensation         1 year 8 months 12 days   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              
2020 Equity Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized               185,000