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Debt (Tables) | 9 Months Ended
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Oct. 03, 2021
Components of Convertible Senior Notes | The below tables represent the key components of Teradyne’s convertible senior notes:
|  | October 3, 2021 |  |  | December 31, 2020 |
|  | (in thousands) |
Debt principal |  | $ | 157,972 |  |  | $ | 459,971 |
Unamortized discount |  |  | 12,969 |  |  |  | 49,860 |
Net Carrying amount of convertible debt |  | $ | 145,003 |  |  | $ | 410,111 |
Reported as follows:
|  | October 3, 2021 |  |  | December 31, 2020 |
|  | (in thousands) |
Current debt |  | $ | 32,219 |  |  | $ | 33,343 |
Long-term debt |  |  | 112,784 |  |  |  | 376,768 |
Net carrying amount of convertible debt |  | $ | 145,003 |  |  | $ | 410,111 |
|  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | October 3, 2021 |  |  | September 27, 2020 |  |  | October 3, 2021 |  |  | September 27, 2020 |
|  | (in thousands) |
Contractual interest expense on the coupon |  | $ | 355 |  |  | $ | 1,438 |  |  | $ | 2,666 |  |  | $ | 4,313 |
Amortization of the discount component and debt issue fees recognized as interest expense |  |  | 2,424 |  |  |  | 3,887 |  |  |  | 9,771 |  |  |  | 11,518 |
Total interest expense on the convertible debt |  | $ | 2,779 |  |  | $ | 5,325 |  |  | $ | 12,437 |  |  | $ | 15,831 |

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- Definition Tabular disclosure of convertible debt instrument. Includes, but is not limited to, principal amount and amortized premium or discount. + References No definition available. + Details
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