Quarterly report pursuant to Section 13 or 15(d)

Notes Payable - Components of Notes Payable (Details)

v3.8.0.1
Notes Payable - Components of Notes Payable (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Senior Notes $ 81,059 $ 76,569
Less: Unamortized debt issuance costs (3,418) (3,412)
Unamortized discount 357 424
Notes payable to KMS' former shareholders, net of $67 and $98 of unamortized discount in 2018 and 2017, respectively    
Debt Instrument [Line Items]    
Unamortized discount 67 98
Notes payable to SSN's former shareholders, net of $244 and $326 of unamortized discount in 2018 and 2017, respectively    
Debt Instrument [Line Items]    
Unamortized discount 244 326
Notes Payable    
Debt Instrument [Line Items]    
Total 98,997 96,849
Notes Payable | Notes payable to clearing firm under forgivable loans    
Debt Instrument [Line Items]    
Long-term debt 2,143 2,143
Notes Payable | Note payable under subsidiary's term loan with bank    
Debt Instrument [Line Items]    
Long-term debt 5,925 6,563
Notes Payable | Note payable under subsidiary's revolver with bank    
Debt Instrument [Line Items]    
Long-term debt 185 216
Notes Payable | Notes payable by subsidiary to certain former shareholders of Highland    
Debt Instrument [Line Items]    
Long-term debt 6,738 6,738
Notes Payable | Notes payable to KMS' former shareholders, net of $67 and $98 of unamortized discount in 2018 and 2017, respectively    
Debt Instrument [Line Items]    
Long-term debt 1,478 1,958
Notes Payable | Notes payable to SSN's former shareholders, net of $244 and $326 of unamortized discount in 2018 and 2017, respectively    
Debt Instrument [Line Items]    
Long-term debt $ 4,887 $ 6,074