Annual report pursuant to Section 13 and 15(d)

Notes Payable (Notes Payable) (Details)

v3.6.0.2
Notes Payable (Notes Payable) (Details) - USD ($)
1 Months Ended 12 Months Ended
Jan. 02, 2015
Oct. 15, 2014
Aug. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jul. 31, 2014
Debt Instrument [Line Items]              
Unamortized discount       $ 872,000 $ 1,492,000    
Interest paid       3,523,000 3,807,000 $ 5,920,000  
Highland              
Debt Instrument [Line Items]              
Notes payable-current             $ 21,834,000
Highland | Promissory Notes | 10% Promissory Notes due February 26, 2019              
Debt Instrument [Line Items]              
Amount outstanding       6,738,000 6,738,000    
Interest rate, stated percentage             10.00%
KMS              
Debt Instrument [Line Items]              
Notes payable-current   $ 600,000          
Interest rate, stated percentage   1.84%          
Term   4 years          
Imputed interest rate   5.50%          
KMS | Promissory Notes              
Debt Instrument [Line Items]              
Periodic payment, principal and interest   $ 7,508,000          
Imputed interest rate   5.50%          
KMS | Promissory Notes | 1.84% Promissory Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage   1.84%          
Term   4 years          
Debt instrument, face amount   $ 8,000,000          
Unamortized discount       221,000 343,000    
Long-term debt       3,852,000 5,711,000    
KMS | Promissory Notes | 1.84% Promissory Notes | Board of Directors Chairman              
Debt Instrument [Line Items]              
Long-term debt       2,065,000      
KMS | Promissory Notes | 1.84% Promissory Notes | President              
Debt Instrument [Line Items]              
Long-term debt       1,213,000      
KMS | Promissory Notes | 1.84% Promissory Notes | Chief Compliance Officer              
Debt Instrument [Line Items]              
Long-term debt       445,000      
KMS | Promissory Notes | 1.84% Promissory Notes | Vice President- Brokerage Operations              
Debt Instrument [Line Items]              
Long-term debt       160,000      
KMS | Promissory Notes | 1.84% Promissory Notes | Chief Technology Officer              
Debt Instrument [Line Items]              
Long-term debt       154,000      
KMS | Promissory Notes | 1.84% Promissory Notes | Vice President- Licensing and Administration              
Debt Instrument [Line Items]              
Long-term debt       36,000      
KMS | Promissory Notes | 1.84% Promissory Notes | Officer              
Debt Instrument [Line Items]              
Interest paid       90,000 126,000 $ 31,000  
KMS | Subordinated Notes              
Debt Instrument [Line Items]              
Debt instrument, face amount     $ 600,000        
Interest paid       $ 16,000 $ 26,000    
KMS | Subordinated Notes | Prime Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.00%        
Interest rate at period end       3.50% 3.50%    
SSN | Promissory Notes              
Debt Instrument [Line Items]              
Periodic payment, principal and interest $ 18,697,000            
Imputed interest rate 5.10%            
SSN | Promissory Notes | 1.84% Promissory Notes              
Debt Instrument [Line Items]              
Debt instrument, face amount $ 20,000,000            
SSN | Promissory Notes | 1.84% Promissory Notes | President              
Debt Instrument [Line Items]              
Debt instrument, face amount       $ 228,000      
SSN | Promissory Notes | 1.84% Promissory Notes | Chief Compliance Officer              
Debt Instrument [Line Items]              
Debt instrument, face amount       57,000      
SSN | Promissory Notes | 1.84% Promissory Notes | Chief Financial Officer              
Debt Instrument [Line Items]              
Debt instrument, face amount       34,000      
SSN | Promissory Notes | 1.84% Promissory Notes | Vice President-Trading              
Debt Instrument [Line Items]              
Debt instrument, face amount       11,000      
SSN | Promissory Notes | 1.84% Promissory Notes | Officer              
Debt Instrument [Line Items]              
Interest paid       7,000 $ 9,000    
SSN | Promissory Notes | 1.74% Promissory Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage 1.74%            
Term 4 years            
Imputed interest rate 5.10%            
Unamortized discount       651,000 977,000    
Long-term debt       $ 10,769,000 $ 15,378,000