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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partners [Member]
Net income (loss) $ (94,878,439)    
Net asset value, beginning of period at Dec. 31, 2016 [1] $ 37.18    
Net asset value, end of period at Mar. 31, 2017 [1] $ 30.28    
Balances at Dec. 31, 2017 $ 652,091,733 $ 0 $ 652,091,733
Addition of partnership shares 463,303,459 0 463,303,459
Redemption of partnership shares (775,148,903) 0 (775,148,903)
Net income (loss) 11,097,621 0 11,097,621
Balances at Mar. 31, 2018 $ 351,343,910 $ 0 $ 351,343,910
Net asset value, beginning of period at Dec. 31, 2017 [1] $ 23.34    
Net asset value, end of period at Mar. 31, 2018 $ 22.54    
[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.