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Debt (Tables)
12 Months Ended
Dec. 31, 2020
Components of Convertible Senior Notes
The below tables represent the key components of Teradyne’s convertible senior notes:
 
 
  
December 31,
2020
 
  
December 31,
2019
 
 
  
(in thousands)
 
Debt principal
  
$
459,971
 
  
$
460,000
 
Unamortized discount
  
 
49,860
 
  
 
65,313
 
    
 
 
    
 
 
 
Net carrying amount of convertible debt
  
$
410,111
 
  
$
394,687
 
    
 
 
    
 
 
 
Reported as follows:
 
 
  
December 31,
2020
 
  
December 31,
2019
 
 
  
(in thousands)
 
Current debt
  
$
33,343
 
  
$
—  
 
Long-term debt
  
 
376,768
 
  
 
394,687
 
    
 
 
    
 
 
 
Net carrying amount of convertible debt
  
$
410,111
 
  
$
394,687
 
    
 
 
    
 
 
 
 
  
For the year ended
 
 
  
December 31,
2020
 
  
December 31,
2019
 
 
  
(in thousands)
 
Contractual interest expense on the coupon
  
$
5,750
 
  
$
5,750
 
Amortization of the discount component and debt issue fees recognized as interest expense
  
 
15,454
 
  
 
14,706
 
    
 
 
    
 
 
 
Total interest expense on the convertible debt
  
$
21,204
 
  
$
20,456