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Debt (Tables) | 12 Months Ended
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Dec. 31, 2022
Components of Convertible Senior Notes | The below tables represent the key components of Teradyne’s convertible senior notes:
|  | December 31, 2022 |  |  | December 31, 2021 |
|  | (in thousands) |
Debt principal |  | $ | 50,228 |  |  | $ | 116,980 |
Unamortized debt issuance fees (1) |  |  | 113 |  |  |  | 8,554 |
Net carrying amount of convertible debt |  | $ | 50,115 |  |  | $ | 108,426 |
Reported as follows:
|  | December 31, 2022 |  |  | December 31, 2021 |
|  | (in thousands) |
Current debt |  | $ | 50,115 |  |  | $ | 19,182 |
Long-term debt |  |  | — |  |  |  | 89,244 |
Net carrying amount of convertible debt |  | $ | 50,115 |  |  | $ | 108,426 |
|  | For the Years Ended |
|  | December 31, 2022 |  |  | December 31, 2021 |
|  | (in thousands) |
Contractual interest expense on the coupon |  | $ | 732 |  |  | $ | 3,009 |
Amortization of the issuance fees recognized as interest expense (2) |  |  | 209 |  |  |  | 11,019 |
Total interest expense on the convertible debt |  | $ | 941 |  |  | $ | 14,028 |
(1) | Unamortized debt issuance fees as of December 31, 2021 include unamortized debt discount of $8.0 million, which was eliminated with the adoption of ASU 2020-06 on January 1, 2022.
(2) | For the year ended December 31, 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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