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Debt (Tables) | 9 Months Ended
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Oct. 02, 2022
Components of Convertible Senior Notes | The below tables represent the key components of Teradyne’s convertible senior notes:
|  | October 2, 2022 |  |  | December 31, 2021 |
|  | (in thousands) |
Debt principal |  | $ | 64,980 |  |  | $ | 116,980 |
Unamortized debt issuance fees (1) |  |  | 189 |  |  |  | 8,554 |
Net Carrying amount of convertible debt |  | $ | 64,791 |  |  | $ | 108,426 |
|  | October 2, 2022 |  |  | December 31, 2021 |
|  | (in thousands) |
Current debt |  | $ | 14,596 |  |  | $ | 19,182 |
Long-term debt |  |  | 50,195 |  |  |  | 89,244 |
Net carrying amount of convertible debt |  | $ | 64,791 |  |  | $ | 108,426 |
|  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | October 2, 2022 |  |  | October 3, 2021 |  |  | October 2, 2022 |  |  | October 3, 2021 |
|  | (in thousands) |  |  | (in thousands) |
Contractual interest expense on the coupon |  | $ | 159 |  |  | $ | 355 |  |  | $ | 592 |  |  | $ | 2,666 |
Amortization of debt issuance fees recognized as interest expense (2) |  |  | 43 |  |  |  | 2,424 |  |  |  | 173 |  |  |  | 9,771 |
Total interest expense on the convertible debt |  | $ | 202 |  |  | $ | 2,779 |  |  | $ | 765 |  |  | $ | 12,437 |
(1) | Unamortized debt issuance fees as of December 31, 2021 include unamortized debt discount of $8.1 million, which was eliminated with the adoption of ASU 2020- 0 6 on January 1, 2022.
(2) | Three and nine months ended October 3, 2021 includes the amortization of debt discount component, which was eliminated with the adoption of ASU 2020-06 on January 1, 2022.

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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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