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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of fair value, assets measured on recurring basis
       Fair Value Measurements at December 31, 2020 
       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  $126,627   $
—
   $126,627   $
—
 
Foreign currency forward exchange contracts not accounted for using hedge accounting   253    
—
    253    
—
 
                     
   $126,880   $
—
   $126,880   $
—
 

 

       Fair Value Measurements at December 31, 2019 
       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  $119,714   $
—
   $119,714   $
—
 
Foreign currency forward exchange contracts accounted for using hedge accounting   16    
 
    16    
 
 
Foreign currency forward exchange contracts not accounted for using hedge accounting   112    
 
    112    
 
 
                     
   $119,842   $
—
   $119,842   $
—
 
Liabilities:                    
Interest rate swap  $30   $
—
   $30   $
—