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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of fair value, assets measured on recurring basis

The following tables present our financial assets and liabilities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy. The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value.

 

          Fair Value Measurements at December 31, 2017  
          Quoted Prices in     Significant Other     Significant  
          Active Markets for     Observable     Unobservable  
          Identical Assets     Inputs     Inputs  
    Total     (Level 1)     (Level 2)     (Level 3)  
Assets:                        
Short-term investments   $ 69,899     $     $ 69,899     $  
Foreign currency forward exchange contracts accounted for using hedge accounting     26               26          
Foreign currency forward exchange contracts not accounted for using hedge accounting     119             119        
                                 
    $ 70,044     $     $ 70,044     $  
Liabilities:                                
Interest rate swap   $ 529     $     $ 529     $  

 

          Fair Value Measurements at December 31, 2016  
          Quoted Prices in     Significant Other     Significant  
          Active Markets for     Observable     Unobservable  
          Identical Assets     Inputs     Inputs  
    Total     (Level 1)     (Level 2)     (Level 3)  
Assets:                        
Short-term investments   $ 94,202     $     $ 94,202     $  
                                 
Liabilities:                                
Foreign currency forward exchange contracts accounted for using hedge accounting   $ 181     $     $ 181     $  
Foreign currency forward exchange contracts not accounted for using hedge accounting     418             418        
Interest rate swap     908             908        
    $ 1,507     $     $ 1,507     $