Deferred Revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]
Deferred license fees	$ 1,248	$ 1,921
Deferred license fees [Member]
Deferred Revenue Arrangement [Line Items]
Deferred license fees	1,089	1,812
Deferred AirBar revenues [Member]
Deferred Revenue Arrangement [Line Items]
Deferred license fees	137	109
Deferred sensor modules revenues [Member]
Deferred Revenue Arrangement [Line Items]
Deferred license fees	$ 22