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Impairments (Tables)
9 Months Ended
Sep. 30, 2021
Disclosure Text Block Supplement [Abstract]  
Summary of Impairments Recognized
The following table summarizes impairments recognized by the Company:
 
    
Three Months Ended

September 30,
    
Nine Months Ended

September 30,
 
    
2021
    
2020
    
2021
    
2020
 
Lease termination – New York office (Note 13)
   $ 9,277      $ —        $ 9,277      $ —    
Fixed assets – New York office (Note 8)
     6,576        —          6,576        —    
Lease termination – London office (Note 13)
     —          —          303        —    
AdvisorEngine – Financial Interests (Note 23)
     —          —          —          19,672  
Thesys – Series Y Preferred (Note 4)
     —          3,080        —          3,080  
    
 
 
    
 
 
    
 
 
    
 
 
 
Total
   $ 15,853      $ 3,080      $ 16,156      $ 22,752