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Convertible Notes, Other Debts And Finance Lease (Tables) | 9 Months Ended
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Sep. 25, 2020
Debt Instrument [Line Items] |
Convertible Debt Interest | The following table presents interest expense recognized for the 2020 Notes, 2022 Notes and the 2024 Notes (in thousands):
| Three months ended |  | Nine months ended
| September 25, 2020 |  | September 27, 2019 |  | September 25, 2020 |  | September 27, 2019
Contractual interest expense | $ | 1,070 |  |  | $ | 1,235 |  |  | $ | 3,141 |  |  | $ | 3,800 |
Amortization of debt discount | 1,366 |  |  | 1,513 |  |  | 4,549 |  |  | 4,425 |
Amortization of debt issuance costs | 212 |  |  | 185 |  |  | 638 |  |  | 535 |
Total interest expense recognized | $ | 2,648 |  |  | $ | 2,933 |  |  | $ | 8,328 |  |  | $ | 8,760 |
Schedule of Other Debt and Capital Leases | The Company has a variety of debt and credit facilities primarily in France to satisfy the financing requirements of the operations of its French subsidiary. These arrangements are summarized in the table below (in thousands):
| September 25, 2020 |  | December 31, 2019
Financing from French government agencies related to various government incentive programs (1) | $ | 14,533 |  |  | $ | 16,566 |
Relief loans (2) | 6,375 |  |  | — |
Term loans | 179 |  |  | 587 |
Obligations under finance leases | 22 |  |  | 71 |
Total debt obligations | 21,109 |  |  | 17,224 |
Less: current portion | (11,402 | ) |  | (6,713 | )
Long-term portion | $ | 9,707 |  |  | $ | 10,511 |
(1) As of September 25, 2020 and December 31, 2019, loans backed by French R&D tax credit receivables were $13.0 million and $15.1 million, respectively. As of September 25, 2020, the French Subsidiary had an aggregate of $19.5 million of R&D tax credit receivables from the French government from 2021 through 2024. See Note 8, “Balance Sheet Components” for additional information. These tax loans have a fixed rate of 0.6%, plus EURIBOR 1 month + 1.3% and mature between 2021 through 2023. The remaining loans of $1.5 million at September 25, 2020, primarily relate to financial support from French government agencies for R&D innovation projects at minimal interest rates, and these loans mature between 2020 through 2025. (2) Refer to the below section “Relief Loans” for the description of these loans.
Schedule of Maturities of Long-term Debt | The table below presents the future minimum repayments of debts and finance lease obligations in France as of September 25, 2020 (in thousands):
Years ending December 31, | Finance lease obligations |  | Other Debt obligations
2020 (remaining three months) | $ | — |  |  | $ | 300 |
2021 | 22 |  |  | 11,183 |
2022 | — |  |  | 5,159 |
2023 | — |  |  | 3,670 |
2024 | — |  |  | 117 |
Thereafter | — |  |  | 658 |
Total | $ | 22 |  |  | $ | 21,087 |
Convertible Note due 2022 |
Debt Instrument [Line Items] |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The following table presents the components of the 2022 Notes as of September 25, 2020 (in thousands, except for years and percentages):
| September 25, 2020
Liability: |
Principal amount | $ | 37,707 |
Less: Debt discount, net of amortization | (1,521 | )
Less: Debt issuance costs, net of amortization | (477 | )
Carrying amount | $ | 35,709 |
Remaining amortization period (years) | 2.2 |
Effective interest rate on liability component | 6.95 | %
Convertible Note due 2024 |
Debt Instrument [Line Items] |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The following table presents the components of the 2024 Notes as of September 25, 2020 and December 31, 2019 (in thousands, except for years and percentages):
| September 25, 2020 |  | December 31, 2019
Liability: |  |  |
Principal amount | $ | 115,500 |  |  | $ | 115,500 |
Less: Debt discount, net of amortization | (20,415 | ) |  | (23,652 | )
Less: Debt issuance costs, net of amortization | (2,776 | ) |  | (3,219 | )
Carrying amount | $ | 92,309 |  |  | $ | 88,629 |
Remaining amortization period (years) | 3.9 |  |  | 4.7 |
Effective interest rate on liability component | 7.95 | % |  | 7.95 | %
Convertible Note due 2020 |
Debt Instrument [Line Items] |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The following table presents the components of the 2020 Notes as of September 25, 2020 and December 31, 2019 (in thousands, except for years and percentages):
| September 25, 2020 |  | December 31, 2019
Liability: |  |  |
Principal amount | $ | 8,053 |  |  | $ | 45,785 |
Less: Debt discount, net of amortization | (72 | ) |  | (2,151 | )
Less: Debt issuance costs, net of amortization | (9 | ) |  | (259 | )
Carrying amount | $ | 7,972 |  |  | $ | 43,375 |
Remaining amortization period (years) | 0.2 |  |  | 0.9 |
Effective interest rate on liability component | 9.94 | % |  | 9.94 | %

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