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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
Dec. 31, 2020
USD ($)
$ / item
Jun. 30, 2011
USD ($)
Significant Accounting Policies [Line Items]    
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets   $ 50,000
Creation Baskets    
Significant Accounting Policies [Line Items]    
Number of Shares per basket | $ / item 50,000  
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets $ 350