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Investments - Details of Investments Carried at Cost (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Investment [Line Items] |  |
Investments | $ 40,002 | $ 35,721
Investments - Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 40,002 | 35,721
Investments - Cost [Member] |  |
Investment [Line Items] |  |
Investments | 45,725 | 35,725
Securrency Inc. - Series A Convertible Preferred Stock - Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 3,588 | 8,488
Securrency Inc. - Series A Convertible Preferred Stock - Cost [Member] |  |
Investment [Line Items] |  |
Investments | 8,112 | 8,112
Securrency Inc. - Series B Convertible Preferred Stock - Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 5,500 | 5,500
Securrency Inc. - Series B Convertible Preferred Stock - Cost [Member] |  |
Investment [Line Items] |  |
Investments | 5,500 | 5,500
Securrency, Inc.—Secured Convertible Note - Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 8,887 | 0
Securrency, Inc.—Secured Convertible Note - Cost [Member] |  |
Investment [Line Items] |  |
Investments | 10,000 | 0
Securrency, Inc.—Convertible Note Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 13,836 | 14,500
Securrency, Inc.—Convertible Note Cost [Member] |  |
Investment [Line Items] |  |
Investments | 15,000 | 15,000
Subtotal – Securrency, Inc. - Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 31,811 | 28,488
Subtotal – Securrency, Inc. - Cost [Member] |  |
Investment [Line Items] |  |
Investments | 38,612 | 28,612
Fnality International Limited Convertible Note Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 7,879 | 6,921
Fnality International Limited Convertible Note Cost [Member] |  |
Investment [Line Items] |  |
Investments | 6,863 | 6,863
Other InvestmentsCarrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 312 | 312
Other Investments Cost [Member] |  |
Investment [Line Items] |  |
Investments | $ 250 | $ 250

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- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(18)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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