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Balance Sheets Details - Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Components of other assets    
Equity method investments $ 8,422 $ 9,849
Value added tax receivable, long term 1,845  
Other intangible assets 1,048 1,148
Other assets 672 576
Other assets, Total $ 11,987 $ 11,573