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Description of Business and Summary of Significant Accounting Policies (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive loss at beginning of period $ (468) $ (611) $ (348)
Total accumulated other comprehensive income (loss) at end of period 34 (468) (611)
Unrealized Losses On Investments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive loss at beginning of period (21) (39) (54)
Other comprehensive income before reclassifications 15 18 15
Amounts reclassified from accumulated other comprehensive income (loss) to other income (loss)
Total accumulated other comprehensive income (loss) at end of period (6) (21) (39)
Foreign Currency Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive loss at beginning of period (447) (572) (294)
Other comprehensive income before reclassifications 660 532 156
Amounts reclassified from accumulated other comprehensive income (loss) to other income (loss) (173) (407) (434)
Total accumulated other comprehensive income (loss) at end of period $ 40 $ (447) $ (572)