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Convertible Notes, Debts and Finance Leases (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Instrument [Line Items] |
Schedule of Debt | 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:
| December 31,
(in thousands) | 2020 |  | 2019
Financing from French government agencies related to various government incentive programs (1) | $ | 14,974 |  |  | $ | 16,566 |
Relief loans (2) | 6,694 |  |  | — |
Term loans | 167 |  |  | 587 |
Obligations under finance leases | 22 |  |  | 71 |
Total debt obligations | 21,857 |  |  | 17,224 |
Less: current portion | (11,771) |  |  | (6,713) |
Long-term portion | $ | 10,086 |  |  | $ | 10,511 |
(1) Loans backed by French R&D tax credit receivables were $13.6 million and $15.1 million as of December 31, 2020 and 2019, respectively. As of December 31, 2020, the French subsidiary had an aggregate of $21.5 million of R&D tax credit receivables from the French government from 2021 through 2024. These tax loans have a fixed rate of 0.6%, plus EURIBOR 1 month plus 1.3% and mature between 2021 through 2023. The remaining loans of $1.4 million and $1.5 million as of December 31, 2020 and 2019, respectively, primarily relate to financial support from French government agencies for R&D innovation projects at minimal interest rates, and the loans outstanding at December 31, 2020 mature between 2021 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 December 31, 2020 (in thousands):
Years ending December 31, | Finance lease obligations |  | Other Debt obligations
2021 | $ | 22 |  |  | $ | 11,749 |
2022 | — |  |  | 5,420 |
2023 | — |  |  | 3,856 |
2024 | — |  |  | 184 |
2025 | — |  |  | 626 |
Total | $ | 22 |  |  | $ | 21,835 |
Convertible Note due 2022 [Member] |
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:
(in thousands, except for years and percentages) | As of December 31, 2020
Liability: |  |  |
Principal amount | $ | 37,707 |  |  |
Less: Debt discount, net of amortization | (1,357) |  |  |
Less: Debt issuance costs, net of amortization | (425) |  |  |
Carrying amount | $ | 35,925 |  |  |
Remaining amortization period (years) | 1.9 |  |
Effective interest rate on liability component | 6.95 | % |  |
Convertible Interest Expense Recognized | The following table presents interest expense recognized for the 2022 Notes:
(in thousands) | Year ended December 31, 2020
Contractual interest expense | $ | 953 |  |  |  |  |
Amortization of debt discount | 373 |  |  |  |  |
Amortization of debt issuance costs | 117 |  |  |  |  |
Total interest expense recognized | $ | 1,443 |  |  |  |  |
Convertible Note due 2024 [Member] |
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 December 31,
(in thousands, except for years and percentages) | 2020 |  | 2019
Liability: |  |  |
Principal amount | $ | 115,500 |  |  | $ | 115,500 |
Less: Debt discount, net of amortization | (19,294) |  |  | (23,652) |
Less: Debt issuance costs, net of amortization | (2,624) |  |  | (3,219) |
Carrying amount | $ | 93,582 |  |  | $ | 88,629 |
Remaining amortization period (years) | 3.7 |  | 4.7
Effective interest rate on liability component | 7.95 | % |  | 7.95 | %
Convertible Interest Expense Recognized | The following table presents interest expense recognized for the 2024 Notes:
| Year ended December 31,
(in thousands) | 2020 |  | 2019 |  |
Contractual interest expense | $ | 2,310 |  |  | $ | 687 |  |  |
Amortization of debt discount | 4,358 |  |  | 1,226 |  |  |
Amortization of debt issuance costs | 595 |  |  | 166 |  |  |
Total interest expense recognized | $ | 7,263 |  |  | $ | 2,079 |  |  |
Convertible Note due 2020 [Member] |
Debt Instrument [Line Items] |
Convertible Interest Expense Recognized | The following table presents interest expense recognized for the 2020 Notes:
| Year ended December 31,
(in thousands) | 2020 |  | 2019 |  | 2018
Contractual interest expense | $ | 936 |  |  | $ | 4,148 |  |  | $ | 5,130 |
Amortization of debt discount | 1,158 |  |  | 4,787 |  |  | 5,408 |
Amortization of debt issuance costs | 138 |  |  | 577 |  |  | 652 |
Total interest expense recognized | $ | 2,232 |  |  | $ | 9,512 |  |  | $ | 11,190 |

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