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Investments - Details of Investments Carried at Cost (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investment [Line Items] |  |
Investments | $ 26,902 | $ 35,721
Other InvestmentsCarrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 26,902 | 35,721
Other Investments Cost [Member] |  |
Investment [Line Items] |  |
Investments | 35,725 | 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 - Convertible Note - Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 10,051 | 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 | 19,139 | 28,488
Subtotal – Securrency, Inc. - Cost [Member] |  |
Investment [Line Items] |  |
Investments | 28,612 | 28,612
Fnality International Limited Convertible Note Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 7,451 | 6,921
Fnality International Limited Convertible Note Cost [Member] |  |
Investment [Line Items] |  |
Investments | 6,863 | 6,863
Onramp Invest Inc Series A-4 Preferred Stock - Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 312 | 312
Onramp Invest Inc - Series A-4 Preferred Stock - Cost [Member] |  |
Investment [Line Items] |  |
Investments | $ 250 | $ 250

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