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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Business Agreement Termination [Line Items]        
Total rent expense $ 214 $ 204 $ 611 $ 826
Arbitration award       1,967
PIEPS VECTOR Avalanche Transceivers [Member]        
Business Agreement Termination [Line Items]        
Arbitration award       $ 1,967