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Fair Value Measurement (Details) - 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 41  
Financial liabilities 497
Total fair value of assets and liability 1,508  
Level 1 [Member]    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Segregated client cash accounts 1,964 $ 2,343
Restricted cash $ 41  
Financial liabilities  
Total fair value of assets and liability $ 2,005  
Level 2 [Member]    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Segregated client cash accounts
Restricted cash  
Financial liabilities  
Total fair value of assets and liability  
Level 3 [Member]    
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Segregated client cash accounts
Restricted cash  
Financial liabilities $ (497)  
Total fair value of assets and liability $ (497)