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Stock-Based Compensation - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 09, 2015
Aug. 31, 2020
Jul. 31, 2020
Jan. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment                  
Allocated Share-based Compensation Expense         $ 91,000 $ 120,000 $ 272,000 $ 362,000  
Stock Repurchased During Period, Shares   72 14,699   14,771        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period             295,500   267,000
Deferred Compensation Arrangement with Individual Shares Outstanding         143,384   143,384    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized             0   1,000,000
Share-based Payment Arrangement, Employee [Member]                  
Share-based Compensation Arrangement by Share-based Payment                  
Number of Shares, Granted             (295,500)   (267,000)
Minimum [Member] | Share-based Payment Arrangement, Employee [Member]                  
Share-based Compensation Arrangement by Share-based Payment                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             2 years    
Maximum [Member] | Share-based Payment Arrangement, Employee [Member]                  
Share-based Compensation Arrangement by Share-based Payment                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             3 years    
Other Employees [Member]                  
Share-based Compensation Arrangement by Share-based Payment                  
Restricted Stock or Unit Expense         $ 146,000   $ 438,000    
Employees and executive officers [Member]                  
Share-based Compensation Arrangement by Share-based Payment                  
Stock Issued During Period, Shares, New Issues             482,939    
Stock Repurchased During Period, Shares             222,575    
Consultants [Member]                  
Share-based Compensation Arrangement by Share-based Payment                  
Stock Issued During Period, Shares, New Issues       190,476          
Board Members [Member]                  
Share-based Compensation Arrangement by Share-based Payment                  
Stock Issued During Period, Shares, New Issues         19,879   40,487    
Restricted Stock Units (RSUs) [Member]                  
Share-based Compensation Arrangement by Share-based Payment                  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options         $ 694,000   $ 694,000    
Adjustments to Additional Paid in Capital Reclassification Of Share Based Compensation To Liability         177,000 $ 215,000 $ 531,000 $ 644,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period             295,500    
Restricted Stock Units (RSUs) [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Distribution Period             7 years    
Restricted Stock Units (RSUs) [Member] | Other Employees [Member]                  
Share-based Compensation Arrangement by Share-based Payment                  
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition         $ 51,000   $ 152,000    
2015 Stock Incentive Plan[Member]                  
Share-based Compensation Arrangement by Share-based Payment                  
Number of Shares, Granted             0    
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 100.00%                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 800,000                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized             1,000,000