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Intangible Assets (Schedule of net intangible assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Original cost $ 5,781 $ 5,770  
Accumulated amortization 4,734 2,846  
Intangible assets, Net 1,047 2,924  
Amortization expense 1,888 2,240 $ 1,168
Current technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Original cost 3,844 3,833  
Accumulated amortization 3,181 1,930  
Intangible assets, Net $ 663 1,903  
Useful life 3 years    
Customer relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Original cost $ 1,937 1,937  
Accumulated amortization 1,553 916  
Intangible assets, Net $ 384 $ 1,021  
Useful life 3 years