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Investments - Details of Investments Carried at Cost (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Securrency Inc. - Series A Convertible Preferred Stock - Carrying Value [Member] |  |
Investments | $ 8,488 | $ 8,112
Securrency Inc. - Series A Convertible Preferred Stock - Cost [Member] |  |
Investments | 8,112 | 8,112
Securrency Inc. - Series B Convertible Preferred Stock - Carrying Value [Member] |  |
Investments | 5,500 |
Securrency Inc. - Series B Convertible Preferred Stock - Cost [Member] |  |
Investments | 5,500 |
Subtotal – Securrency, Inc. - Carrying Value [Member] |  |
Investments | 13,988 | 8,112
Subtotal – Securrency, Inc. - Cost [Member] |  |
Investments | 13,612 | 8,112
Investments - Carrying Value |  |
Investments | 14,238 | 8,112
Investments - Cost |  |
Investments | 13,862 | $ 8,112
Onramp Invest, Simple Agreement for Future Equity - Carrying Value |  |
Investments | 250 |
Onramp Invest, Simple Agreement for Future Equity - Cost |  |
Investments | $ 250 |

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References No definition available. + Details
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