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Commitments (Tables)
12 Months Ended
Dec. 31, 2012
Commitments and Contingencies [Abstract]  
Minimum future lease payments and non-cancellable unconditional purchase obligations
                 
    Operating Leases     Purchase Obligations  
    (In thousands)  

2013

  $ 597     $ 116  

2014

    585       0  

2015

    511       0  

2016

    422       0  
   

 

 

   

 

 

 

Total

  $                       2,115     $                        116  
   

 

 

   

 

 

 
Rent expense
                         
            Year ended December 31,           
   

2012

   

2011

   

2010

 
    (In thousands)  
       

Rent expense

  $         550     $         30     $         703