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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]  
Summary of Accounts Receivable from Related Parties
The following table summarizes accounts receivable from related parties which are included as a component of accounts receivable on the Company’s Consolidated Balance Sheets:
 
 
 
December 31,
 
 
 
2018
 
 
2017
 
Receivable from WTT
 
$
14,678
 
 
$
19,433
 
Receivable from ETFS Issuers
 
 
8,779
 
 
 
—
 
Receivable from BI and WTI
 
 
951
 
 
 
979
 
Receivable from WTAMC
 
 
167
 
 
 
87
 
Receivable from WTCS
 
 
95
 
 
 
97
 
Total
 
$
24,670
 
 
$
20,596
 
Summary of Revenues from Advisory Services Provided to Related Parties
The following table summarizes revenues from advisory services provided to related parties:
 
 
 
Year Ended December 31,
 
 
 
2018
 
 
2017
 
 
2016
 
Advisory services provided to WTT
 
$
203,031
 
 
$
215,513
 
 
$
209,199
 
Advisory services provided to ETFS Issuers
 
 
54,601
 
 
 
—
 
 
 
—
 
Advisory services provided to BI and WTI
 
 
10,448
 
 
 
9,205
 
 
 
7,003
 
Advisory services provided to WTAMC
 
 
1,757
 
 
 
466
 
 
 
148
 
Advisory services provided to WTCS
 
 
1,267
 
 
 
1,508
 
 
 
1,867
 
Total
 
$
271,104
 
 
$
226,692
 
 
$
218,217