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Investments - Details of Investments Carried at Cost (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Investment [Line Items] |  |
Investments | $ 26,339 | $ 14,238
Securrency Inc. - Series A Convertible Preferred Stock - Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 8,488 | 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 - Convertible Note - Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 5,844 | 0
Securrency Inc - Convertible Note - Cost [Member] |  |
Investment [Line Items] |  |
Investments | 5,000 | 0
Subtotal – Securrency, Inc. - Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 19,832 | 13,988
Subtotal – Securrency, Inc. - Cost [Member] |  |
Investment [Line Items] |  |
Investments | 18,612 | 13,612
Investments - Carrying Value |  |
Investment [Line Items] |  |
Investments | 26,339 | 14,238
Investments - Cost |  |
Investment [Line Items] |  |
Investments | 25,725 | 13,862
Fnality International Limited Convertible Note Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 6,195 | 0
Fnality International Limited Convertible Note Cost [Member] |  |
Investment [Line Items] |  |
Investments | 6,863 | 0
Onramp Invest Inc Series A-4 Preferred Stock - Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 312 | 250
Onramp Invest Inc - Series A-4 Preferred Stock - Cost [Member] |  |
Investment [Line Items] |  |
Investments | $ 250 | $ 250

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