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Accrued Expenses
 12 Months Ended
Dec. 31, 2012
Accrued Expenses [Abstract]  
Accrued Expenses
5.
Accrued Expenses
 
Accrued expenses consist of the following (in thousands):
 
 
As of December 31,
  
 
2012
  
2011
  
         
Salaries, payroll taxes, vacation and benefits
   $ 621     $ 560  
Accrued consulting fees and other
     183       41  
Total accrued expenses
   $ 804     $ 601