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Convertible Notes and Credit Facilities (Tables) | 12 Months Ended
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Dec. 31, 2019
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 December 31, 2019 and December 31, 2018 (in thousands, except for years and percentages):
| December 31,
| 2019 |  | 2018
Liability: |  |  |
Principal amount | $ | 45,785 |  |  | $ | 128,250 |
Less: Debt discount, net of amortization | (2,151 | ) |  | (11,996 | )
Less: Debt issuance costs, net of amortization | (259 | ) |  | (1,446 | )
Carrying amount | $ | 43,375 |  |  | $ | 114,808 |
Remaining amortization period (years) | 0.9 years |  |  | 1.9 years |
Effective interest rate on liability component | 9.94 | % |  | 9.94 | %
Convertible Interest Expense Recognized | The following table presents interest expense recognized for the 2020 Notes and the 2024 Notes (in thousands):
| Year ended December 31,
| 2019 |  | 2018 |  | 2017
Contractual interest expense | $ | 4,835 |  |  | $ | 5,130 |  |  | $ | 5,130 |
Amortization of debt discount | 6,013 |  |  | 5,408 |  |  | 4,898 |
Amortization of debt issuance costs | 743 |  |  | 652 |  |  | 591 |
Total interest expense recognized | $ | 11,591 |  |  | $ | 11,190 |  |  | $ | 10,619 |
Schedule of Debt | The Company has a variety of debt and credit facilities in France to satisfy the financing requirements of the operations of its French subsidiary. These arrangements are summarized in the table below (in thousands):
| December 31,
| 2019 |  | 2018
Financing from French government agencies related to various government incentive programs (1) | $ | 16,566 |  |  | $ | 18,783 |
Term loans | 587 |  |  | 914 |
Obligations under finance leases | 71 |  |  | 162 |
Total debt obligations | 17,224 |  |  | 19,859 |
Less: current portion | (6,713 | ) |  | (7,175 | )
Long-term portion | $ | 10,511 |  |  | $ | 12,684 |
(1) Loans backed by French R&D tax credit receivables were $15.1 million and $16.7 million as of December 31, 2019 and 2018, respectively. As of December 31, 2019, the French Subsidiary had an aggregate of $23.2 million of R&D tax credit receivables from the French government from 2020 through 2023. (See Note 10, “Certain Balance Sheet Components-Prepaid expenses and other current assets” for more information). These tax loans have a fixed rate of 0.6%, plus EURIBOR 1 month plus 1.3% and mature between 2020 through 2022. The remaining loans of $1.5 million and $2.1 million as of December 31, 2019 and 2018, 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, 2019 mature between 2020 through 2025.
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, 2019 (in thousands):
Years ending December 31, | Finance lease obligations |  | Other Debt obligations
2020 | 49 |  |  | 6,664 |
2021 | 22 |  |  | 5,216 |
2022 | — |  |  | 4,897 |
2023 | — |  |  | 151 |
2024 | — |  |  | 112 |
Thereafter | — |  |  | 112 |
Total | $ | 71 |  |  | $ | 17,152 |
Convertible Note due 2024 [Member] |
Debt Instrument [Line Items] |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments |
| December 31,
| 2019
Liability: |
Principal amount | 115,500 |
Less: Debt discount, net of amortization | (23,652 | )
Less: Debt issuance costs, net of amortization | (3,219 | )
Carrying amount | $ | 88,629 |
Remaining amortization period (years) | 4.7 years |
Effective interest rate on liability component | 7.95 | %
Convertible Note due 2020 [Member] |
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 December 31, 2019 and December 31, 2018 (in thousands, except for years and percentages):
| December 31,
| 2019 |  | 2018
Liability: |  |  |
Principal amount | $ | 45,785 |  |  | $ | 128,250 |
Less: Debt discount, net of amortization | (2,151 | ) |  | (11,996 | )
Less: Debt issuance costs, net of amortization | (259 | ) |  | (1,446 | )
Carrying amount | $ | 43,375 |  |  | $ | 114,808 |
Remaining amortization period (years) | 0.9 years |  |  | 1.9 years |
Effective interest rate on liability component | 9.94 | % |  | 9.94 | %

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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