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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Commitments And Contingencies [Line Items]      
Outstanding purchase commitments for inventory components   $ 9,716 $ 6,570
Proceeds from bank loan   $ 4,000  
Rudolph [Member]      
Commitments And Contingencies [Line Items]      
Amount of claim filed against the company $ 13,000    
IIA [Member]      
Commitments And Contingencies [Line Items]      
Percent of sales derived from research and development, committed amount payable   3.50%  
Dispute settlement paid     2,100
IIA [Member] | Printar [Member]      
Commitments And Contingencies [Line Items]      
Grants received including interest accrued   $ 7,024 $ 6,734