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Significant Accounting Policies - Gold Delivery Agreement Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Gold Delivery Agreement Receivable    
Gold Delivery Agreement receivable $ 0 $ 21
SPDR Long Dollar Gold Trust [Member]    
Gold Delivery Agreement Receivable    
Gold Delivery Agreement receivable $ 0 $ 21