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Investment - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2031 | Dec. 31, 2029
Investment [Line Items] |  |  |  |
Unrealized gain on Series A Shares | $ (2,183) | $ (1,212) |  |
Subsequent Event [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Percentage of voting approval required to redeem all of the outstanding Series A shares |  |  |  | 60.00%
Percentage of voting approval required to redeem all of the outstanding Series B shares |  |  | 90.00% |
Securrency Inc [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Cost of Investments | $ 13,612 |  |  |
Ownership interest percentage | 22.00% |  |  |
Original fully diluted ownership interest percentage | 18.00% |  |  |
Securrency - Series A Preferred Stock [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Number of shares purchased | 5,178,488 |  |  |
Non-cumulative dividend | 6.00% |  |  |
Unrealized gain on Series A Shares | $ 376 |  |  |
Securrency - Series B Convertible Preferred Stock [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Number of shares purchased | 2,004,665 |  |  |
Onramp Invest, LLC [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Cost of Investments | $ 250 |  |  |
Percentage of Discount on future equity financing for preferred stock | 20.00% |  |  |

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