Convertible Notes , Other Debts And Finance Leases - Other Debt and Capital Lease Obligations (Details) - USD ($) $ in Thousands		Sep. 25, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Financing from French government agencies related to various government incentive programs (1)	[1]	$ 14,533	$ 16,566
Relief loans (2)	[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.