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Debt (Tables) | 3 Months Ended
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Apr. 03, 2022
Components of Convertible Senior Notes | The below tables represent the key components of Teradyne’s convertible senior notes:
|  | April 3, 2022 |  |  | December 31, 2021 |
|  | (in thousands) |
Debt principal |  | $ | 96,285 |  |  | $ | 116,980 |
Unamortized debt issuance fees (1) |  |  | 410 |  |  |  | 8,554 |
Net carrying amount of convertible debt |  | $ | 95,875 |  |  | $ | 108,426 |
Reported as follows:
|  | April 3, 2022 |  |  | December 31, 2021 |
|  | (in thousands) |
Current debt |  | $ | 20,497 |  |  | $ | 19,182 |
Long-term debt |  |  | 75,378 |  |  |  | 89,244 |
Net carrying amount of convertible debt |  | $ | 95,875 |  |  | $ | 108,426 |
|  | For the Three Months Ended |
|  | April 3, 2022 |  |  | April 4, 2021 |
|  | (in thousands) |
Contractual interest expense on the coupon |  | $ | 311 |  |  | $ | 1,239 |
Amortization of debt issuance fees recognized as interest expense ( 2 ) |  |  | 66 |  |  |  | 3,836 |
Total interest expense on the convertible debt |  | $ | 377 |  |  | $ | 5,075 |
(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 months ended April 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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