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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Significant Accounting Policies [Abstract]  
Schedule of estimated useful lives of related assets
         

Equipment

     3 years  

Furniture and fixtures

     7 years  
Revenues and expenses under collaborative arrangement
                         
    Year Ended December 31,  
    2012     2011     2010  

ETF advisory fee revenue

   $ 10,968     $ 12,596     $ 6,578  

Expenses:

                        

Fund management and administration

     1,341       1,712       1,057  

Marketing and advertising

     39       406       809  

Sales and business development

     24       159       196  

Other

     —         1       4  
   

 

 

    

 

 

    

 

 

  

Third party expenses

     1,404       2,278       2,066  

Net profit

     9,564       10,318       4,512  

Sharing

   $ 4,662     $ 5,114     $ 2,256