Convertible Notes - Other Debts and Capital Leases (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Financing from French government agencies related to various government incentive programs (1)	[1]	$ 18,783	$ 20,565
Term loans		914	1,282
Obligations under capital leases		162	1,099
Total debt obligations		19,859	22,946
Less: current portion		(7,175)	(7,610)
Long-term portion		$ 12,684	$ 15,336

[1] Loans backed by French R&D tax credit receivables were $16.7 million and $17.7 million as of December 31, 2018 and 2017, respectively. As of December 31, 2018, the TVN French Subsidiary had an aggregate of $26.5 million of R&D tax credit receivables from the French government from 2019 through 2022. (See Note 9, “Certain Balance Sheet Components” for more information). These tax loans have a fixed rate of 0.6%, plus EURIBOR 1 month plus 1.3% and mature between 2019 through 2021. The remaining loans of $2.1 million and $2.9 million as of December 31, 2018 and 2017, 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, 2018 mature between 2019 through 2025.