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Debt (Tables) | 12 Months Ended
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Dec. 31, 2021
Components of Convertible Senior Notes | The below tables represent the key components of Teradyne’s convertible senior notes:
|  | December 31, 2021 |  |  | December 31, 2020 |
|  | (in thousands) |
Debt principal |  | $ | 116,980 |  |  | $ | 459,971 |
Unamortized discount |  |  | 8,554 |  |  |  | 49,860 |
Net carrying amount of convertible debt |  | $ | 108,426 |  |  | $ | 410,111 |
Reported as follows:
|  | December 31, 2021 |  |  | December 31, 2020 |
|  | (in thousands) |
Current debt |  | $ | 19,182 |  |  | $ | 33,343 |
Long-term debt |  |  | 89,244 |  |  |  | 376,768 |
Net carrying amount of convertible debt |  | $ | 108,426 |  |  | $ | 410,111 |
|  | For the year s ended |
|  | December 31, 2021 |  |  | December 31, 2020 |
|  | (in thousands) |
Contractual interest expense on the coupon |  | $ | 3,009 |  |  | $ | 5,750 |
Amortization of the discount component and debt issue fees recognized as interest expense |  |  | 11,019 |  |  |  | 15,454 |
Total interest expense on the convertible debt |  | $ | 14,028 |  |  | $ | 21,204 |

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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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