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Investments - Additional Information (Detail) £ in Thousands, $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2031 | Dec. 31, 2029 | Dec. 31, 2022 GBP (£) | Mar. 31, 2021 shares | Dec. 31, 2019 shares
Investment [Line Items] |  |  |  |  |  |  |  |
Cost of Investments | $ 35,721 | $ 14,238 |  |  |  |  |  |
Unrealized gain (loss) on investments | $ (16,516) | (3,715) | $ 14 |  |  |  |  |
Percentage Of Voting Approval Required To Redeem All Of The Outstanding Notes At Maturity | 50.00% |  |  |  |  |  |  |
Percentage of voting approval required to redeem all of the outstanding notes before maturity | 75.00% |  |  |  |  |  |  |
Percentage of outstanding convertible note | 75 |  |  |  |  |  |  |
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% |  |  |  |  | 22.00% |  |
Original fully diluted ownership interest percentage | 18.00% |  |  |  |  | 18.00% |  |
Securrency - Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Number of shares purchased | shares |  |  |  |  |  |  |  | 5,178,488
Non-cumulative dividend | 6.00% |  |  |  |  |  |  |
Unrealized gain (loss) on investments |  | $ 376 |  |  |  |  |  |
Securrency - Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Number of shares purchased | shares |  |  |  |  |  |  | 2,004,665 |
Fnality International Limited [Member] |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Ownership interest percentage | 5.00% |  |  |  |  | 5.00% |  |
Percentage of discount on future equity financing for preferred stock | 20.00% |  |  |  |  | 20.00% |  |
Unrealized gain (loss) on investments | $ 58 |  |  |  |  |  |  |
Debt Instrument Maturity Date | Dec. 31, 2023 |  |  |  |  |  |  |
Fnality International Limited [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Fair value | $ 6,863 |  |  |  |  | £ 5,000 |  |
Securrency Convertible Note [Member] |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Ownership interest percentage | 7.00% |  |  |  |  | 7.00% |  |
Percentage of discount on future equity financing for preferred stock | 25.00% |  |  |  |  | 25.00% |  |
Unrealized gain (loss) on investments | $ 500 |  |  |  |  |  |  |
Debt Instrument Maturity Date | Apr. 21, 2023 |  |  |  |  |  |  |
Securrency Convertible Note [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Fair value | $ 15,000 |  |  |  |  |  |  |

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