Investments - Details of Investments Carried at Cost (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Investment [Line Items]
Investments	$ 26,339	$ 14,238
Securrency Inc. - Series A Convertible Preferred Stock - Carrying Value [Member]
Investment [Line Items]
Investments	8,488	8,488
Securrency Inc. - Series A Convertible Preferred Stock - Cost [Member]
Investment [Line Items]
Investments	8,112	8,112
Securrency Inc. - Series B Convertible Preferred Stock - Carrying Value [Member]
Investment [Line Items]
Investments	5,500	5,500
Securrency Inc. - Series B Convertible Preferred Stock - Cost [Member]
Investment [Line Items]
Investments	5,500	5,500
Securrency Inc - Convertible Note - Carrying Value [Member]
Investment [Line Items]
Investments	5,844	0
Securrency Inc - Convertible Note - Cost [Member]
Investment [Line Items]
Investments	5,000	0
Subtotal – Securrency, Inc. - Carrying Value [Member]
Investment [Line Items]
Investments	19,832	13,988
Subtotal – Securrency, Inc. - Cost [Member]
Investment [Line Items]
Investments	18,612	13,612
Investments - Carrying Value
Investment [Line Items]
Investments	26,339	14,238
Investments - Cost
Investment [Line Items]
Investments	25,725	13,862
Fnality International Limited Convertible Note Carrying Value [Member]
Investment [Line Items]
Investments	6,195	0
Fnality International Limited Convertible Note Cost [Member]
Investment [Line Items]
Investments	6,863	0
Onramp Invest Inc Series A-4 Preferred Stock - Carrying Value [Member]
Investment [Line Items]
Investments	312	250
Onramp Invest Inc - Series A-4 Preferred Stock - Cost [Member]
Investment [Line Items]
Investments	$ 250	$ 250