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Fair Value Measurement (Tables)
6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of fair value, assets measured on recurring basis

The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value.

 

          Fair Value Measurements at June 30, 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   $ 77,562     $     $ 77,562     $  
Foreign currency forward exchange contracts not accounted for using hedge accounting     225               225          
    $ 77,787     $     $ 77,787     $  
Liabilities:                                
Foreign currency forward exchange contracts accounted for using hedge accounting   $ 28     $     $ 28     $  
Interest rate swap     358             358        
    $ 386     $     $ 386     $  

  

          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     $