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ORGANIZATION AND BUSINESS (Details)
 1 Months Ended
Jan. 04, 2018
$ / shares
shares
Apr. 30, 2007
Apr. 18, 2007
USD ($)
$ / shares
shares
Jun. 30, 2019
$ / shares
$ / item
Dec. 31, 2018
$ / shares
Jun. 30, 2018
$ / shares
Jan. 05, 2018
shares
Dec. 31, 2017
$ / shares
Organization, Consolidation and Presentation of Financial Statements Disclosure [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 | $ / item       1,000        
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission   30,000,000            
Net Asset Value Per Unit | $ / shares       $ 19.83 $ 24.35 $ 23.71   $ 23.34
Number of units issued     200,000          
Value of unit issued | $     $ 10,001,000          
Number of registered units       2,280,000,000        
Issued units             912,318,300  
United States [Member] | NYMEX Natural Gas Futures Contracts [Member] | Open Futures Contracts - Long [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Number of Contracts       14,078        
United States [Member] | ICE Natural Gas Futures LD1 H Contracts [Member] | Open Futures Contracts - Long [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Number of Contracts       0        
Prior to Reverse Split [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Net Asset Value Per Unit | $ / shares $ 5.69   $ 50.00          
Issued units 97,466,476              
Stockholders' Equity Note, Stock Split, Conversion Ratio 4              
Following Reverse Split [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Net Asset Value Per Unit | $ / shares $ 22.76              
Capital Units, Outstanding 24,366,619              
Creation Baskets [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Number of units per basket | $ / item       100,000        
Redemption Baskets [Member]                
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                
Number of units per basket | $ / item       100,000