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Significant Accounting Policies - Gold Delivery Agreement Payable (Detail)
$ in Thousands
Jun. 30, 2017
USD ($)
[1]
Gold Delivery Agreement Payable  
Gold Delivery Agreement payable $ 136
SPDR Long Dollar Gold Trust [Member]  
Gold Delivery Agreement Payable  
Gold Delivery Agreement payable $ 136
[1] No comparative has been provided as operations commenced on January 27, 2017. See Note 1.