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Debt (Tables) | 9 Months Ended
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Oct. 01, 2023
Components of Convertible Senior Notes | The tables below represent the key components of Teradyne’s convertible senior notes:
|  | October 1, 2023 |  |  | December 31, 2022 |
|  | (in thousands) |
Debt principal |  | $ | 23,529 |  |  | $ | 50,228 |
Unamortized debt issuance fees |  |  | — |  |  |  | 113 |
Net Carrying amount of convertible debt |  | $ | 23,529 |  |  | $ | 50,115 |
Teradyne’s convertible senior notes were reported as current debt at October 1, 2023 and December 31, 2022. The interest expense on Teradyne’s convertible senior notes for the three and nine months ended October 1, 2023 and October 2, 2022 was as follows:
|  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | October 1, 2023 |  |  | October 2, 2022 |  |  | October 1, 2023 |  |  | October 2, 2022 |
|  | (in thousands) |  |  | (in thousands) |
Contractual interest expense on the coupon |  | $ | 74 |  |  | $ | 159 |  |  | $ | 312 |  |  | $ | 592 |
Amortization of debt issuance fees recognized as interest expense |  |  | — |  |  |  | 43 |  |  |  | 113 |  |  |  | 173 |
Total interest expense on the convertible debt |  | $ | 74 |  |  | $ | 202 |  |  | $ | 425 |  |  | $ | 765 |

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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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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration