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Investments - Additional Information (Detail) £ in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2031	Dec. 31, 2029	Jun. 30, 2023 GBP (£)	Dec. 31, 2022 USD ($)	Mar. 31, 2021 shares	Dec. 31, 2019 shares
Investment [Line Items]
Cost of Investments	$ 40,002	$ 40,002					$ 35,721
Unrealized gain (loss) on investments		$ 947	$ (9,322)
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	$ 13,612
Ownership interest percentage	22.00%	22.00%				22.00%
Original fully diluted ownership interest percentage	17.00%	17.00%				17.00%
Impairment of investments	$ 0		$ 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
Securrency Secured Convertible Note [Member]
Investment [Line Items]
Ownership interest percentage	9.00%	9.00%				9.00%
Percentage of discount on future equity financing for preferred stock	25.00%	25.00%				25.00%
Unrealized gain (loss) on investments	$ 1,113
Debt instrument, redemption, description		upon the occurrence of a corporate transaction for an amount which is the greater of (i) an amount equal to (x) 1.25 times (y) the sum of the principal amount and all accrued interest of the note (the “Liquidity Premium”) and (ii) such amount as would have been payable to the Company if the note had been converted, immediately prior to such corporate transaction, into that number of shares of the then most senior series of preferred stock of Securrency obtained by dividing (A) the Liquidity Premium by (B) the applicable conversion price, as set forth in the note.
Debt Instrument Maturity Date		Dec. 31, 2023
Securrency Secured Convertible Note [Member] | Accounting Standard Update 201601 [Member]
Investment [Line Items]
Fair value	$ 10,000	$ 10,000
Fnality International Limited [Member]
Investment [Line Items]
Ownership interest percentage	5.00%	5.00%				5.00%
Percentage of discount on future equity financing for preferred stock	20.00%	20.00%				20.00%
Unrealized gain (loss) on investments	$ 428	$ 958
Debt Instrument Maturity Date		Dec. 31, 2023
Fnality International Limited [Member] | Accounting Standard Update 201601 [Member]
Investment [Line Items]
Fair value	$ 6,863	$ 6,863				£ 5,000
Securrency Convertible Note [Member]
Investment [Line Items]
Ownership interest percentage	7.00%	7.00%				7.00%
Unrealized gain (loss) on investments	$ 3,785	$ 664
Debt Instrument Maturity Date		Oct. 20, 2023
Securrency Convertible Note [Member] | Accounting Standard Update 201601 [Member]
Investment [Line Items]
Fair value	$ 15,000	$ 15,000

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