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Investments - Additional Information (Detail) £ in Thousands, $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 08, 2021 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) shares | Dec. 31, 2021 USD ($) | Mar. 31, 2031 | Dec. 31, 2029 | Mar. 31, 2022 GBP (£) | Dec. 31, 2019 shares
Investment [Line Items] |  |  |  |  |  |  |  |
Cost of Investments |  | $ 20,938 |  | $ 14,238 |  |  |  |
Unrealized gain on Series A Shares |  | $ (5,142) | $ (549) |  |  |  |  |
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% |  |  |  |  |  |
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 |  |  |  | 17.00% |  |  |  |
Securrency - Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Number of shares purchased | shares |  |  |  |  |  |  |  | 5,178,488
Non-cumulative dividend |  |  |  | 6.00% |  |  |  |
Unrealized gain on Series A Shares | $ 237 |  |  |  |  |  |  |
Securrency - Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Number of shares purchased | shares |  |  | 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% |  |  |  |
Impairment Of Investments |  | $ 0 |  |  |  |  |  |
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% |
Debt Instrument Maturity Date |  | Dec. 31, 2023 |  |  |  |  |  |
Percentage of voting approval required to redeem all of the outstanding notes before maturity |  | 163.00% |  |  |  |  |  |
Fnality International Limited [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Fair value |  | $ 6,863 |  |  |  |  | £ 5,000 |

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