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Investments - Additional Information (Detail) £ in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2031	Dec. 31, 2029	Mar. 31, 2023 GBP (£)	Dec. 31, 2022 USD ($)	Mar. 31, 2021 shares	Dec. 31, 2019 shares
Investment [Line Items]
Cost of Investments	$ 26,902					$ 35,721
Unrealized gain (loss) on investments	$ 1,954	$ (5,142)
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	17.00%				17.00%
Impairment Of Investments	$ 0
Securrency - Series A Preferred Stock [Member]
Investment [Line Items]
Number of shares purchased | shares								5,178,488
Non-cumulative dividend	6.00%
Impairment Of Investments	$ 4,900
Securrency - Series B Convertible Preferred Stock [Member]
Investment [Line Items]
Number of shares purchased | shares							2,004,665
Fnality International Limited Convertible Note | Accounting Standards Update 2016-01 [Member]
Investment [Line Items]
Fair value	$ 6,863				£ 5,000
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	$ 530
Debt Instrument Maturity Date	Dec. 31, 2023
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	$ 4,449
Debt Instrument Maturity Date	Oct. 20, 2023
Securrency Convertible Note [Member] | Accounting Standards Update 2016-01 [Member]
Investment [Line Items]
Fair value	$ 15,000

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