Financial Highlights Per Share Performance - Summary of Per Share Data (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Per Share Data:
Principal market net asset value, beginning of period	$ 27.95	$ 17.39	$ 18.15	$ 13.39
Net (decrease) increase in net assets from investment operations:
Net investment loss	(0.14)	(0.1)	(0.28)	(0.21)
Net realized and unrealized (loss) gain	(8.61)	(0.82)	1.33	3.29
Net (decrease) increase in net assets resulting from operations	(8.75)	(0.92)	1.05	3.08
Principal market net asset value, end of period	$ 19.2	$ 16.47	$ 19.2	$ 16.47
Total return	(31.31%)	(5.29%)	5.79%	23.00%
Ratios to average net assets:
Net investment loss	(2.50%)	(2.50%)	(2.50%)	(2.50%)
Expenses	(2.50%)	(2.50%)	(2.50%)	(2.50%)