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Impairments (Tables)
9 Months Ended
Sep. 30, 2020
Disclosure Text Block Supplement [Abstract]  
Details of Impairment of Long-Lived Assets Held and Used by Asset
The following table summarizes impairments recognized by the Company:
 
    
Three Months Ended
September 30,
    
Nine Months Ended
September 30,
 
    
2020
    
2019
    
2020
    
2019
 
AdvisorEngine – Financial Interests (Note 7)
   $ —        $ —        $ 19,672      $ —    
Thesys – Series Y Preferred (Note 9)
     3,080        —          3,080        —    
WTJ (Note 25)
     —          —          —          572  
  
 
 
    
 
 
    
 
 
    
 
 
 
Total
   $ 3,080      $ —        $ 22,752      $ 572