Convertible Notes , Other Debts And Finance Leases - Other Debt and Capital Lease Obligations (Details) - USD ($) $ in Thousands		Mar. 27, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Financing from French government agencies related to various government incentive programs (1)	[1]	$ 16,160	$ 16,566
Term loans		174	587
Obligations under finance leases		57	71
Other Long-term Debt		16,391	17,224
Less: current portion		(6,343)	(6,713)
Long-term portion		$ 10,048	$ 10,511

[1] As of March 27, 2020 and December 31, 2019, loans backed by French R&D tax credit receivables were $14.7 million and $15.1 million, respectively. As of March 27, 2020, the French Subsidiary had an aggregate of $23.5 million of R&D tax credit receivables from the French government from 2020 through 2023. 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 2020 through 2022. The remaining loans of $1.5 million at March 27, 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.