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Impairments (Tables)
12 Months Ended
Dec. 31, 2019
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:
                         
 
Years Ended December 31,
 
 
2019
 
 
2018
 
 
2017
 
AdvisorEngine—Financial interests (Note 8)
  $
30,138
    $
—  
    $
—  
 
GCC—Intangible asset
   
     
9,953
     
—  
 
AdvisorEngine—Option
   
     
3,278
     
—  
 
Thesys—Series Y Preferred (Note 10)
   
     
3,829
     
—  
 
WisdomTree Japan
   
572
     
326
     
—  
 
                         
Total
  $
30,710
    $
17,386
    $
—