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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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