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Significant Accounting Policies - Schedule of Changes in Resale of Shares (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Accounting Policies [Abstract]
Creations	200	0	[1]
Redemptions	0	0	[1]
Net change in Number of Shares Created and Redeemed	200	0	[1]
Creations	$ 1,731
Redemptions
Net change in Number of Shares Created and Redeemed	$ 1,731	$ 0
[1] Adjusted for effects of stock split. The stock split was effective on March 21, 2019. See Note 1.

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