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Debt (Tables)
12 Months Ended
Dec. 31, 2011
Debt  
Schedule of maturity of long-term debt

2012

  $ 248  

2013

    268  

2014

    290  

2015

    314  

2016

    340  

Thereafter

    1,194  
       

 

    2,654  

Less current portion

    248  
       

 

  $ 2,406  
 
Schedule of components of interest expenses recorded on the notes
 
  Year ended December 31,  
 
  2011   2010   2009  

Contractual interest

  $ 2,025   $ 4,355   $ 4,356  

Accretion of the discount on the notes

    1,260     3,058     2,846  
               

Total interest expense on the notes

  $ 3,285   $ 7,413   $ 7,202  
               

Effective interest rate

    6.7 %   7.0 %   6.8 %
Schedule of carrying amounts of the liability and equity components of convertible notes
 
  December 31,
2011
  December 31,
2010
 

Carrying amount of the equity component

  $   $ 16,318  
           

Principal balance of the liability component

  $   $ 105,574  

Less: unamortized discount

        4,436  
           

Net carrying value of the liability component

  $   $ 101,138