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Inventories (Inventories) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventories [Abstract]    
Components $ 13,062 $ 9,690
Work in process 7,654 6,584
Finished products [1] 11,449 6,445
Total inventories 32,165 22,719
Current assets 30,109 21,336
Long-term assets (A) $ 2,056 $ 1,383
[1] includes systems at customer locations not yet sold, as of December 31, 2018 and 2017, in the amount of $7,546 and $3,425 respectively.