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Description of Business and Summary of Significant Accounting Policies (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) at beginning of period $ 34 $ (468)
Total accumulated other comprehensive income (loss) at end of period 112 (393)
Unrealized Losses On Investments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) at beginning of period (6) (21)
Other comprehensive (loss) income before reclassifications (8) 2
Amounts reclassified from accumulated other comprehensive income (loss) to other income (loss)
Total accumulated other comprehensive income (loss) at end of period (14) (19)
Foreign Currency Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) at beginning of period 40 (447)
Other comprehensive (loss) income before reclassifications 168 52
Amounts reclassified from accumulated other comprehensive income (loss) to other income (loss) (82) 21
Total accumulated other comprehensive income (loss) at end of period $ 126 $ (374)