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The Company and Summary of Significant Accounting Policies - Comprehensive Income (loss) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accumulated other comprehensive income:    
Accumulated other comprehensive income $ 3,407 $ 253
Accumulated other comprehensive income including noncontrolling interest    
Accumulated other comprehensive income:    
Unrealized (loss) gain on investments, net (93) 45
Cumulative translation adjustment 3,904 178
Accumulated other comprehensive income 3,811 223
Accumulated other comprehensive income attributable to noncontrolling interest    
Accumulated other comprehensive income:    
Less: Cumulative translation adjustment attributable to noncontrolling interests $ 404 $ (30)