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Investment in American Shale Oil, LLC (Tables)
 9 Months Ended
Sep. 30, 2013
Investment In American Shale Oil, Llc [Abstract]  
Summary in the change in balance of the Company's investment in AMSO, LLC
 
   
Nine Months Ended
September 30,
  
   
2013
    
2012
  
   
(in thousands)
  
Balance, beginning of period
   $ 242     $ (685 )
Capital contributions
    
2,345
       2,925  
Equity in the net loss of AMSO, LLC
     (2,607 )     (2,252 )
Balance, end of period
   $ (20 )   $ (12 )
Maximum exposure to additional loss
   
(in thousands)
  
AMSO’s committed investment in AMSO, LLC based on the 2013 budget
   $ 4,249  
Less: cumulative capital contributions to AMSO, LLC
     (2,345 )
Less: liability for equity loss in AMSO, LLC at September 30, 2013
     (20 )
    Maximum exposure to additional loss
   $ 1,884  
Summarized unaudited statements of operations AMSO, LLC
 
   
Three Months Ended
September 30,
    
Nine Months Ended
September 30,
  
   
2013
    
2012
    
2013
    
2012
  
   
(in thousands)
  
Operating expenses:
                        
General and administrative
  
$
162
    
$
132
    
$
435
    
$
389
  
Research and development
    
1,758
      
1,320
      
7,055
      
6,046
  
Loss from operations
    
1,920
      
1,452
      
7,490
      
6,435
  
Other income
    
—
      
—
      
41
      
—
  
Net loss
  
$
(1,920
)
  
$
(1,452
)
  
$
(7,449
)
  
$
(6,435
)