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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Gains on Investments	$ 64	$ 76	$ 212	$ 17
WisdomTree ETF [Member]
Related Party Transaction [Line Items]
Investment	$ 2,927		$ 2,927		$ 7,117

X

- Definition

Amount of realized and unrealized gain (loss) on investment.

+ References

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- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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