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Investments (Tables) | 3 Months Ended
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Mar. 31, 2023
Investment [Line Items] |
Investments | The following table sets forth the Company’s investments:
|  |  |  | March 31, 2023 |  |  | December 31, 2022 |
|  |  | Carrying Value |  |  | Cost |  |  | Carrying Value |  |  | Cost |
| Securrency, Inc.—Series A convertible preferred stock |  | $ | 3,588 |  |  | $ | 8,112 |  |  | $ | 8,488 |  |  | $ | 8,112 |
| Securrency, Inc.—Series B convertible preferred stock |  |  | 5,500 |  |  |  | 5,500 |  |  |  | 5,500 |  |  |  | 5,500 |
| Securrency, Inc.—convertible note |  |  | 10,051 |  |  |  | 15,000 |  |  |  | 14,500 |  |  |  | 15,000 |
| Subtotal—Securrency, Inc. |  | $ | 19,139 |  |  | $ | 28,612 |  |  | $ | 28,488 |  |  | $ | 28,612 |
| Fnality International Limited—convertible note |  |  | 7,451 |  |  |  | 6,863 |  |  |  | 6,921 |  |  |  | 6,863 |
| Other investments |  |  | 312 |  |  |  | 250 |  |  |  | 312 |  |  |  | 250 |
|  |  | $ | 26,902 |  |  | $ | 35,725 |  |  | $ | 35,721 |  |  | $ | 35,725 |
Securrency Inc [Member] |
Investment [Line Items] |
Summary of Inputs Used in PWERM Approach of Investment | The table below presents the probability ascribed to potential outcomes used in the PWERM (classified as Level 3 in the fair value hierarchy):
|  | March 31, 2023 |
Conversion of Securrency Series A Shares upon a future equity financing |  |  | 33.3% |
Redemption of Securrency Series A Shares upon a corporate transaction |  |  | 33.3% |
Default |  |  | 33.4% |
Securrency Convertible Note [Member] |
Investment [Line Items] |
Summary of Inputs Used in PWERM Approach of Investment | The table below presents the probability ascribed to potential outcomes used in the PWERM (classified as Level 3 in the fair value hierarchy) and the time to exit:
|  | March 31, 2023 |  | December 31, 2022
Conversion of note upon a future equity financing |  | 33.3% |  | 60%
Redemption of note upon a corporate transaction |  | 33.3% |  | 25%
Default |  | 33.4% |  | 15%
Time to potential outcome (in years) |  | 0.56 |  | 0.33
Fnality Convertible Note [Member] |
Investment [Line Items] |
Summary of Inputs Used in PWERM Approach of Investment | The table below presents the probability ascribed to potential outcomes used in the PWERM (classified as Level 3 in the fair value hierarchy) and the time to exit:
|  | March 31, 2023 |  | December 31, 2022
Conversion of note upon a future financing round |  | 85% |  | 85%
Redemption of note upon a change of control |  | 10% |  | 10%
Default |  | 5% |  | 5%
Time to potential outcome (in years) |  | 0.08 |  | 0.25

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