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Intangible Assets
 18 Months Ended
Jun. 30, 2011
Intangible Assets [Abstract]  
Intangible Assets
5. Intangible Assets
   
Intangible assets consist of the following:
                 
    June 30,     December 31,  
    2011     2010  
    (Amounts in thousands)  
 
               
Intangible assets:
               
Purchased biomass conversion technology
  $ 2,599     $ 2,599  
Accumulated amortization
    (621 )     (535 )
 
           
Purchased biomass conversion technology, net
    1,978       2,064  
 
               
Technology licenses
    400       400  
Accumulated amortization
    (48 )     (38 )
 
           
Technology licenses, net
    352       362  
 
           
 
               
Intangible assets, net
  $ 2,330     $ 2,426  
 
           
Intangible asset amortization expense was $48,000 for the three months ended June 30, 2011 and 2010 and $96,000 for the six months ended June 30, 2011 and 2010, respectively.