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Certain Balance Sheet Components - Other long-term assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
French R&D tax credits receivable $ 19,249 $ 22,322
Deferred tax assets 8,695 10,462
Equity investment 3,593 3,593
Other 6,840 6,536
Other long-term assets, Total $ 38,377 $ 42,913