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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partners [Member]
Net income (loss) $ (152,131,287)    
Net asset value, beginning of period at Dec. 31, 2016 [1] $ 37.18    
Net asset value, end of period at Sep. 30, 2017 [1] $ 26.18    
Balances at Dec. 31, 2017 $ 652,091,733 $ 0 $ 652,091,733
Addition of partnership shares 1,050,763,122 0 1,050,763,122
Redemption of partnership shares (1,447,405,128) 0 (1,447,405,128)
Net income (loss) 50,003,562 0 50,003,562
Balances at Sep. 30, 2018 $ 305,453,289 $ 0 $ 305,453,289
Net asset value, beginning of period at Dec. 31, 2017 [1] $ 23.34    
Net asset value, end of period at Sep. 30, 2018 $ 24.86    
[1] On January 4, 2018, there was a 1-for-4 reverse share split. Historical shares outstanding, net asset value per share and market value per share have been adjusted to reflect the 1-for-4 reverse share split on a retroactive basis.