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Investments - Details of Investments Carried at Cost (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Dec. 27, 2019
Investment [Line Items]
Investments	$ 8,112	$ 11,192
Thesys Group, Inc [Member]
Investment [Line Items]
Investments	0	3,080
Securrency Inc [Member] | Convertible Preferred Stock [Member]
Investment [Line Items]
Investments	$ 8,112	$ 8,112	$ 8,112

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.

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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X

- Details

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