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Financial Highlights (Tables)
 12 Months Ended
Dec. 31, 2018
Financial Highlights [Abstract]  
Operating Performance Calculation Per Unit
The following is the per Unit operating performance calculation for the years ended December 31, 2018 and 2017:

  
Class 0
  
Class 2
 
Per unit operating performance
      
Net asset value per Unit, December 31, 2016
 
$
146.92
  
$
107.43
 
Net loss:
        
Net investment loss
  
(2.78
)
  
(3.04
)
Net loss on investments
  
(3.24
)
  
(2.45
)
Net loss
  
(6.02
)
  
(5.49
)
Net asset value per Unit, December 31, 2017
  
140.90
   
101.94
 
Net loss:
        
Net investment loss
  
(1.57
)
  
(1.90
)
Net loss on investments
  
(5.63
)
  
(4.03
)
Net loss
  
(7.20
)
  
(5.93
)
Net asset value per Unit, December 31, 2018
 
$
133.70
  
$
96.01
 
Ratios to Average Members' Capital and Total Return
The following represents ratios to average Members’ Capital, excluding the Managing Member, and total return for the years ended December 31, 2018 and 2017:

  
Class 0
  
Class 2
 
  
2018
  
2017
  
2018
  
2017
 
             
Total return before Incentive Allocation
  
(5.11
)%
  
(4.10
)%
  
(5.82
)%
  
(5.11
)%
Incentive Allocation
  
0.00
   
0.00
   
0.00
   
0.00
 
Total return after Incentive Allocation
  
(5.11
)%
  
(4.10
)%
  
(5.82
)%
  
(5.11
)%
                 
Net investment loss before Incentive Allocation
  
(1.11
)%
  
(1.96
)%
  
(1.86
)%
  
(2.95
)%
Incentive Allocation
  
0.00
   
0.00
   
0.00
   
0.00
 
Net investment loss after Incentive Allocation
  
(1.11
)%
  
(1.96
)%
  
(1.86
)%
  
(2.95
)%
                 
Total expenses before Incentive Allocation
  
2.70
%
  
2.81
%
  
3.44
%
  
3.81
%
Incentive Allocation
  
0.00
   
0.00
   
0.00
   
0.00
 
Total expenses after Incentive Allocation
  
2.70
%
  
2.81
%
  
3.44
%
  
3.81
%