Consolidated Financial Highlights - Schedule of Financial Highlights (Details) - USD ($) |
9 Months Ended | 12 Months Ended | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Jun. 30, 2025 |
Sep. 30, 2024 |
Jun. 30, 2024 |
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| Net asset value at beginning of period (in dollars per share) | $ 0.15 | $ 0.18 | $ 4.44 | $ 13.75 | $ 14.82 | $ 17.7 | |||||||||||||||||
| Income from investment operations: | |||||||||||||||||||||||
| Net investment income (loss), before deferred taxes(1) (in dollars per share) | [1] | (0.09) | 0.27 | 0.16 | (1.81) | 0.44 | 0.09 | ||||||||||||||||
| Net realized and unrealized losses on investments, before deferred taxes (in dollars per share) | (0.02) | (0.3) | (4.42) | (7.5) | (1.51) | (2.3) | |||||||||||||||||
| Tax expense (in dollars per share) | 0 | 0 | 0 | 0 | 0 | (1.13) | |||||||||||||||||
| Net realized and unrealized losses on investments, after deferred taxes (in dollars per share) | (0.02) | (0.3) | (4.42) | (7.5) | (1.51) | (3.43) | |||||||||||||||||
| Total from investment operations (in dollars per share) | (0.11) | (0.03) | (4.26) | (9.31) | (1.07) | (3.34) | |||||||||||||||||
| Realized capital gains (in dollars per share) | 0 | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||
| Anti-dilutive effect from capital share transactions (in dollars per share) | 0 | 0 | 0 | 0 | 0 | 0.46 | |||||||||||||||||
| Net asset value at end of period (in dollars per share) | 0.04 | 0.15 | 0.18 | 4.44 | 13.75 | 14.82 | |||||||||||||||||
| Market value at end of period (in dollars per share) | $ 0.06 | $ 0.06 | $ 0.3 | $ 0.95 | $ 4.01 | $ 4.47 | |||||||||||||||||
| Total Return | |||||||||||||||||||||||
| Based on Net Asset Value | [2] | (73.33%) | (16.67%) | (95.95%) | (67.71%) | (7.22%) | (16.27%) | ||||||||||||||||
| Based on Market Value | [2] | 0.00% | (80.00%) | (68.42%) | (76.31%) | (10.29%) | (30.48%) | ||||||||||||||||
| Net assets at end of period (millions) | $ 296,547 | $ 1,060,679 | $ 1,260,371 | $ 30,600,000 | $ 94,800,000 | $ 102,100,000 | $ 747,259 | $ 1,544,147 | $ 1,017,920 | ||||||||||||||
| Before tax (benefit)/expense | [3] | 139.62% | (195.48%) | (7.21%) | 4.11% | 3.12% | 3.10% | ||||||||||||||||
| Tax expense(2)(3) | [4],[5] | 0.00% | 14.28% | 0.00% | 0.00% | [6] | 0.00% | 8.02% | [6] | ||||||||||||||
| Total expenses | [3] | 139.62% | (181.20%) | (7.21%) | 4.11% | 3.12% | 11.12% | ||||||||||||||||
| Total expenses, excluding incentive fees and deferred tax expense | [3] | 139.62% | (195.48%) | (7.21%) | 4.11% | 3.12% | 3.10% | ||||||||||||||||
| Total expenses, excluding incentive fees and deferred tax expense and fee waiver | [3] | 139.62% | 121.49% | 11.91% | 4.11% | 3.12% | 3.10% | ||||||||||||||||
| Net investment income (loss) | [3] | (107.81%) | 206.76% | 8.13% | (20.96%) | 2.94% | 0.64% | ||||||||||||||||
| Net investment income (loss) before fee waiver | [3] | (107.81%) | (110.22%) | (10.99%) | (20.96%) | 2.94% | 0.64% | ||||||||||||||||
| Portfolio turnover rate | [2] | 0.00% | 0.00% | 1.00% | 15.00% | 16.00% | 13.00% | ||||||||||||||||
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