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Accrued Expenses (Tables)
12 Months Ended
Dec. 31, 2012
Accrued Expenses [Abstract]  
Summary of accrued expenses
                 
    2012     2011  

Accrued compensation and benefits

  $ 10,080     $ 2,116  

Accrued sales and marketing costs

    3,402       5,831  

Accrued rent obligations

    1,103       1,821  

Accrued interest

    8       2,807  

Other

    4,225       3,612  
   

 

 

   

 

 

 

Total accrued expenses

  $ 18,818     $ 16,187