Commitments And Contingencies (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Commitments And Contingencies [Abstract]
Limited warranty on most hardware products (in number of years)	1 year
Amount of non-cancelable purchase commitments with various suppliers of customized inventory and inventory components	$ 7.1
Amount of guarantees for payment of customs and foreign grants	$ 3.0