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Debt (Tables) | 6 Months Ended
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Jul. 03, 2022
Components of Convertible Senior Notes | The below tables represent the key components of Teradyne’s convertible senior notes:
|  | July 3, 2022 |  |  | December 31, 2021 |
|  | (in thousands) |
Debt principal |  | $ | 74,688 |  |  | $ | 116,980 |
Unamortized debt issuance fees (1) |  |  | 260 |  |  |  | 8,554 |
Net Carrying amount of convertible debt |  | $ | 74,428 |  |  | $ | 108,426 |
Reported as follows:
|  | July 3, 2022 |  |  | December 31, 2021 |
|  | (in thousands) |
Current debt |  | $ | 9,632 |  |  | $ | 19,182 |
Long-term debt |  |  | 64,796 |  |  |  | 89,244 |
Net carrying amount of convertible debt |  | $ | 74,428 |  |  | $ | 108,426 |
|  | For the Three Months Ended |  |  | For the Six Months Ended |
|  | July 3, 2022 |  |  | July 4, 2021 |  |  | July 3, 2022 |  |  | July 4, 2021 |
|  | (in thousands) |
Contractual interest expense on the coupon |  | $ | 121 |  |  | $ | 1,072 |  |  | $ | 432 |  |  | $ | 2,311 |
Amortization of debt issuance fees recognized as interest expense (2) |  |  | 64 |  |  |  | 3,511 |  |  |  | 130 |  |  |  | 7,347 |
Total interest expense on the convertible debt |  | $ | 185 |  |  | $ | 4,583 |  |  | $ | 562 |  |  | $ | 9,658 |
(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 2020-6 on January 1, 2022.
(2) | Three and six months ended July 4, 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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