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BALANCE SHEET DETAILS - Other Long-term Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other long-term liabilities    
Non-current income tax payable $ 2,530 $ 3,906
Other 1,123 1,075
Total other long-term liabilities $ 3,653 $ 4,981