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Inventories (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Long Term Inventory [Line Items]    
Finished products, Systems at customer locations $ 7,546 $ 3,425
Long-term inventory 2,056 1,383
Spare parts included in noncurrent inventory 2,056 1,383
Obsolescence provision $ 143 $ 84
Minimum [Member]    
Long Term Inventory [Line Items]    
Customer support, term 7 years  
Maximum [Member]    
Long Term Inventory [Line Items]    
Customer support, term 10 years