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Investments - Details of Investments Carried at Cost (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investment [Line Items] |  |
Investments | $ 14,238 | $ 8,112
Securrency Inc. - Series A Convertible Preferred Stock - Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 8,488 | 8,112
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 |
Securrency Inc. - Series B Convertible Preferred Stock - Cost [Member] |  |
Investment [Line Items] |  |
Investments | 5,500 |
Subtotal – Securrency, Inc. - Carrying Value [Member] |  |
Investment [Line Items] |  |
Investments | 13,988 | 8,112
Subtotal – Securrency, Inc. - Cost [Member] |  |
Investment [Line Items] |  |
Investments | 13,612 | 8,112
Onramp Invest, Simple Agreement for Future Equity - Carrying Value |  |
Investment [Line Items] |  |
Investments | 250 |
Onramp Invest, Simple Agreement for Future Equity - Cost |  |
Investment [Line Items] |  |
Investments | 250 |
Investments - Carrying Value |  |
Investment [Line Items] |  |
Investments | 14,238 | 8,112
Investments - Cost |  |
Investment [Line Items] |  |
Investments | $ 13,862 | $ 8,112

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