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Investment - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended	9 Months Ended
	Dec. 27, 2019	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2019	Jun. 20, 2017
Investment [Line Items]
Carrying value of investments		$ 8,112		$ 8,112	$ 11,192
Series Y Preferred Stock [Member]
Investment [Line Items]
Impairment on Thesys preferred stock		3,080		3,080
Thesys Group, Inc [Member]
Investment [Line Items]
Carrying value of investments		0		0	3,080
Thesys Group, Inc [Member] | Convertible Preferred Stock [Member] | Series Y Preferred Stock [Member]
Investment [Line Items]
Number of shares issued						7,797,533
Current fully diluted ownership percentage						19.00%
Securrency Inc [Member]
Investment [Line Items]
Ownership interest percentage			25.00%
Original fully diluted ownership interest percentage			20.00%
Percentage of voting approval required to redeem all of the outstanding Series A preferred			60.00%
Securrency Inc [Member] | Convertible Preferred Stock [Member]
Investment [Line Items]
Carrying value of investments	$ 8,112	$ 8,112		$ 8,112	$ 8,112
Number of shares purchased	5,178,488
Non-cumulative dividend	6.00%

X

- Definition

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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X

- Definition

The percentage rate used to calculate dividend payments on preferred stock.

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X

- Definition

Cost method investment ownership percentage.

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X

- Definition

Original fully diluted ownership interest percentage.

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- Definition

Current fully diluted ownership percentage.

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X

- Definition

Impairment on Thesys preferred stock.

+ References

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X

- Definition

Line items represent reporting 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.

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X

- Definition

Number of Series A Preferred Shares purchased in AdvisorEngine.

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X

- Definition

Percentage of voting approval required.

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X

- Definition

Number of shares awarded in Thesys Series Y Preferred Shares.

+ References

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X

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- Details

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