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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2015
Fair Value of Financial Instruments [Abstract]  
Assets and liabilities measured at fair value
The following table presents assets and liabilities measured at fair value at June 30, 2015:

  
Quoted Prices
in Active
Markets for Identical Assets
  
Significant
Other
Observable Inputs
  
Significant
Unobservable
Inputs
   
(in thousands)
 
(Level 1)
  
(Level 2)
  
(Level 3)
  
Total
 
         
Money market funds
 
$
9,332
  
$
-
  
$
-
  
$
9,332
 
Foreign exchange contracts
  
-
   
115
   
-
   
115
 
                 
Total assets
 
$
9,332
  
$
115
  
$
-
  
$
9,447
 
                 
Foreign exchange contracts
 
$
-
  
$
(133
)
 
$
-
  
$
(133
)
                 
Total liabilities
 
$
-
  
$
(133
)
 
$
-
  
$
(133
)

The following table presents assets and liabilities measured at fair value at December 31, 2014:

  
Quoted Prices
in Active
Markets for Identical Assets
  
Significant
Other
Observable Inputs
  
Significant
Unobservable
Inputs
   
(in thousands)
 
(Level 1)
  
(Level 2)
  
(Level 3)
  
Total
 
         
Money market funds
 
$
11,661
  
$
-
  
$
-
  
$
11,661
 
Foreign exchange contracts
  
-
   
92
   
-
   
92
 
                 
Total assets
 
$
11,661
  
$
92
  
$
-
  
$
11,753
 
                 
Foreign exchange contracts
 
$
-
  
$
(24
)
 
$
-
  
$
(24
)
                 
Total liabilities
 
$
-
  
$
(24
)
 
$
-
  
$
(24
)