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Investments - Details of Investments Carried at Cost (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Investment [Line Items] |  |
Investments | $ 20,938 | $ 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
Subtotal – Securrency, Inc. - Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 13,988 | 13,988
Subtotal – Securrency, Inc. - Cost [Member] |  |
Investment [Line Items] |  |
Investments | 13,612 | 13,612
Onramp Invest, Simple Agreement for Future Equity - Carrying Value |  |
Investment [Line Items] |  |
Investments | 250 | 250
Onramp Invest, Simple Agreement for Future Equity - Cost |  |
Investment [Line Items] |  |
Investments | 250 | 250
Investments - Carrying Value |  |
Investment [Line Items] |  |
Investments | 20,938 | 14,238
Investments - Cost |  |
Investment [Line Items] |  |
Investments | 20,725 | 13,862
Fnality International Limited Convertible Note Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 6,700 | 0
Fnality International Limited Convertible Note Cost [Member] |  |
Investment [Line Items] |  |
Investments | $ 6,863 | $ 0

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