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Investment in American Shale Oil, LLC (Tables)
 6 Months Ended
Jun. 30, 2014
Investment In American Shale Oil, LLC [Abstract]  
Summary in the change in balance of the Company's investment in AMSO, LLC
 
  
Six Months Ended June 30,
 
  
2014
  
2013
 
  
(in thousands)
 
Balance, beginning of period
 $(252) $242 
Capital contributions
  —   1,825 
Equity in the net loss of AMSO, LLC
  —   (1,935)
Balance, end of period
 $(252) $132 
 
Maximum exposure to additional loss
 
   
(in thousands)
  
AMSO’s committed investment in AMSO, LLC based on the budget for the remainder of 2014
   $ 445  
Less: cumulative capital contributions to AMSO, LLC
     —  
Less: liability for equity loss in AMSO, LLC at June 30, 2014
     (252 )
         
MMaximum exposure to additional loss
   $ 193  
Summarized unaudited statements of operations AMSO, LLC

  
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
  
2014
  
2013
  
2014
  
2013
 
  
(in thousands)
 
Operating expenses:
            
General and administrative
 
$
111
  
$
124
  
$
234
  
$
273
 
Research and development
  
2,534
   
2,219
   
4,046
   
5,297
 
Loss from operations
  
2,645
   
2,343
   
4,280
   
5,570
 
Other income
  
—
   
41
   
—
   
41
 
Net loss
 
$
(2,645
)
 
$
(2,302
)
 
$
(4,280
)
 
$
(5,529
)