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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2018
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, 2018  
     Total     Quoted Prices in Active Markets for Identical Assets
(Level 1)
    Significant Other Observable Inputs
(Level 2)
    Significant Unobservable Inputs
(Level 3)
 
Assets:                        
Short-term investments   $ 67,870     $     $ 67,870     $  
Foreign currency forward exchange contracts accounted for using hedge accounting     179               179          
    $ 68,049     $     $ 68,049     $  
Liabilities:                                
Foreign currency forward exchange contracts not accounted for using hedge accounting     45             45        
Interest rate swap   $ 207     $     $ 207     $  
    $ 252     $     $ 252     $  

  

          Fair Value Measurements at December 31, 2017  
     Total     Quoted Prices in Active Markets for Identical Assets
(Level 1)
    Significant Other Observable Inputs
(Level 2)
    Significant Unobservable Inputs
(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     $