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Concentration (Tables)
12 Months Ended
Dec. 31, 2019
Risks and Uncertainties [Abstract]  
Concentration
 Years ended December 31,
201920182017
Advisory fees from our largest client:   
Asset-based fees$1,863  $1,868  $6,312  
Performance-based fees764  2,984  —  
Percent of fee revenue3.2 %4.0 %4.8 %