17. Related Party Transactions

The Company’s revenues are derived primarily from investment advisory agreements with related parties. Under these agreements, the Company has licensed to related parties the use of certain of its own indexes for the U.S. and Canadian WisdomTree ETFs and WisdomTree UCITS ETFs. The Board of Trustees and Board of Directors (including certain officers of the Company) of the related parties are primarily responsible for overseeing the management and affairs of the entities for the benefit of their stakeholders and have contracted with the Company to provide for general management and administration services. The Company is also responsible for certain expenses of the related parties, including the cost of transfer agency, custody, fund administration and accounting, legal, audit, and other non-distribution services, excluding extraordinary expenses, taxes and certain other expenses, which is included in fund management and administration on the Company’s Consolidated Statements of Operations. In exchange, the Company receives fees based on a percentage of the ETF average daily net assets. The advisory agreements may be terminated by the related parties upon notice.

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:


	June 30, 2018		December 31, 2017
Receivable from WTT	$	17,035	$	19,433
Receivable from ETFS Issuers		8,369		—
Receivable from BI and WTI		957		979
Receivable from WTCS		110		97
Receivable from WTAMC		137		87

Total	$	26,608	$	20,596

The following table summarizes revenues from advisory services provided to related parties:


	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Advisory services provided to WTT	$	52,591	$	53,311	$	107,792	$	103,767
Advisory services provided to ETFS Issuers		17,720		—		17,720		—
Advisory services provided to BI and WTI		2,724		2,125		5,351		4,046
Advisory services provided to WTCS		340		330		656		900
Advisory services provided to WTAMC		403		90		715		171

Total	$	73,778	$	55,856	$	132,234	$	108,884

The Company also has investments in certain WisdomTree ETFs of approximately $2,588 and $1,691 at June 30, 2018 and December 31, 2017, respectively. Losses for the three and six months ended June 30, 2018 and 2017 were less than $100.