SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details)	Dec. 31, 2017 $ / Baskets $ / Units
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 | $ / Units	350
Redemption Baskets [Member]
Significant Accounting Policies [Line Items]
Number of units per basket | $ / Baskets	50,000