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Certain Balance Sheet Components - Other long-term assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
French R&D tax credits receivable $ 15,899 $ 19,249
Deferred tax assets 10,575 8,695
Equity investment 3,593 3,593
Other 11,238 6,840
Other long-term assets, Total $ 41,305 $ 38,377