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Goodwill and Other Intangible Assets (Schedule of net other intangible assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
Original cost $ 6,457 $ 6,457  
Accumulated amortization 3,533 1,293  
Other intangible assets, Net 2,924 5,164  
Amortization expense 2,240 1,168 $ 105
Intellectual property [Member]      
Finite-Lived Intangible Assets [Line Items]      
Original cost 200 200  
Accumulated amortization 200 154  
Other intangible assets, Net 46  
Useful life 3 years    
Current technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Original cost $ 3,833 3,833  
Accumulated amortization 1,930 654  
Other intangible assets, Net $ 1,903 3,179  
Useful life 3 years    
Customer relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Original cost $ 1,937 1,937  
Accumulated amortization 916 272  
Other intangible assets, Net $ 1,021 1,665  
Useful life 3 years    
Backlog [Member]      
Finite-Lived Intangible Assets [Line Items]      
Original cost $ 487 487  
Accumulated amortization 487 213  
Other intangible assets, Net $ 274  
Useful life 4 months 24 days