Summary of Significant Accounting Policies (Details 9) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue
License fees	$ 1,761	$ 1,965	$ 4,084	$ 4,086
Sensor modules	85	213	137	423
Non-recurring engineering	30	151	30	152
Total Revenues	1,876	$ 2,329	4,251	$ 4,661
Balances excluding revenue standard [Member]
Revenue
License fees	1,467		4,020
Sensor modules	85		137
Non-recurring engineering	30		30
Total Revenues	1,582		4,187
Impact of Revenue Standard [Member]
Revenue
License fees	294		64
Sensor modules
Non-recurring engineering
Total Revenues	$ 294		$ 64