Comprehensive Income (Loss) (Schedule of Accumulated Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of period	$ (1,409)	$ (1,940)
Decrease related to adoption of ASU 2016-01	(44)
Other comprehensive income (loss) before reclassifications	(234)	531
Reclassifications from accumulated other comprehensive loss	(3)	0
Other comprehensive income (loss), net of tax	(237)	531
Balance at the end of period	(1,690)	(1,409)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of period	(1,394)	(1,928)
Decrease related to adoption of ASU 2016-01	0
Other comprehensive income (loss) before reclassifications	(255)	534
Reclassifications from accumulated other comprehensive loss	0	0
Other comprehensive income (loss), net of tax	(255)	534
Balance at the end of period	(1,649)	(1,394)
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of period	(15)	(12)
Decrease related to adoption of ASU 2016-01	(44)
Other comprehensive income (loss) before reclassifications	21	(3)
Reclassifications from accumulated other comprehensive loss	(3)	0
Other comprehensive income (loss), net of tax	18	(3)
Balance at the end of period	$ (41)	$ (15)