Financial Highlights Per Share Performance - Summary of Per Share Data (Detail) - $ / shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Per Share Data: | |||
| Principal Market NAV, beginning of year | $ 20.23 | $ 18.15 | $ 13.39 |
| Net (decrease) increase in net assets from investment operations: | |||
| Net investment loss | (0.37) | (0.51) | (0.39) |
| Net realized and unrealized (loss) gain | (10.86) | 2.59 | 5.15 |
| Net (decrease) increase in net assets resulting from operations | (11.23) | 2.08 | 4.76 |
| Principal Market NAV, end of year | $ 9 | $ 20.23 | $ 18.15 |
| Total return | (55.51%) | 11.46% | 35.55% |
| Ratios to average net assets: | |||
| Net investment loss | (2.50%) | (2.50%) | (2.50%) |
| Expenses | (2.50%) | (2.50%) | (2.50%) |
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- Definition Percentage, after deduction of fee waiver and incentive fee, of expense to average net assets. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- References No definition available.
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- Definition Per share or unit amount of realized and unrealized gain (loss) on investment. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Per share or unit amount of investment income (loss) and realized and unrealized gain (loss) on investment. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Per-basic-share or unit amount, after investment expense, of dividend and interest investment income (loss) from investment held by investment company. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Percentage of investment income (loss) to average net assets. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Percentage increase (decrease) in fund net asset value, assuming reinvestment of dividends and capital gain distributions. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Net asset value per share or per unit of investments in certain entities that calculate net asset value per share. Includes, but is not limited to, by unit, membership interest, or other ownership interest. Investment includes, but is not limited to, investment in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. Excludes fair value disclosure. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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