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Fair Value Measurement (Tables)
9 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Schedule of fair value, assets measured on recurring basis
Schedule of fair value, assets measured on recurring basis                          
       Fair Value Measurements at
September 30, 2019
 
       Quoted Prices in
Active Markets for
Identical Assets
   Significant Other
Observable
Inputs
   Significant
Unobservable
Inputs
 
   Total   (Level 1)   (Level 2)   (Level 3) 
Assets:                
Short-term investments  $53,244   $     $53,244   $ 
Liabilities:                    
Interest rate swap  $65   $   $65   $     
Foreign currency forward exchange contracts accounted for using hedge accounting   147        147      
Foreign currency forward exchange contracts not accounted for using hedge accounting   1,183        1,183     
 Total Liabilities  $1,395   $   $1,395   $ 

 

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