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Accrued Expenses
 12 Months Ended
Dec. 31, 2013
Accrued Expenses [Abstract]  
Accrued Expenses
5.    Accrued Expenses
 
Accrued expenses consist of the following (in thousands):
 
As of December 31,
  
 
2013
  
2012
  
 
 
  
 
  
Salaries, payroll taxes, vacation and benefits
   $ 706     $ 621  
Accrued consulting fees and other
     272       183  
Total accrued expenses
   $ 978     $ 804