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Fair Value Measurement (Details 3) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Segregated client cash accounts $ 1,964 $ 2,343
Restricted cash   42
Total assets   2,385
Level 1 [Member]    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Segregated client cash accounts $ 1,964 2,343
Restricted cash   42
Total assets   $ 2,385
Level 2 [Member]    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Segregated client cash accounts
Restricted cash  
Total assets  
Level 3 [Member]    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Segregated client cash accounts
Restricted cash  
Total assets