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Significant Accounting Policies - Schedule of Changes in Resale of Shares (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]            
Creations         2,500 6,000 [1]
Redemptions         2,250 1,500 [1]
Net change in Number of Shares Created and Redeemed         250 4,500 [1]
Creations $ 37,409 $ 30,643 $ 42,577 $ 37,409 $ 73,220
Redemptions $ (33,725) $ (18,006) 33,725 18,006
Net change in Value of Shares Created and Redeemed         $ 3,684 $ 55,214
[1] Adjusted for effects of a 10-for-1 stock split. Stock split was effective on March 7, 2019. See Note 1.