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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning of the period $ (3,125) $ 25,719 $ 55,819
Other comprehensive income (loss) (219) 50 94
End of the period (16,934) (3,125) 25,719
Accumulated translation adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning of the period 298 280 147
Other comprehensive income (loss) (159) 18 133
End of the period 139 298 280
Accumulated unrealized holding gains (losses) on available-for-sale securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning of the period (7) (39) 0
Other comprehensive income (loss) (60) 32 (39)
End of the period (67) (7) (39)
Accumulated other comprehensive income      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning of the period 291 241 147
Other comprehensive income (loss) (219) 50 94
End of the period $ 72 $ 291 $ 241