Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Net license revenues	$ 1,597	$ 2,072	$ 5,681	$ 6,158
Net revenues	$ 1,923	$ 2,305	$ 6,174	$ 6,966
Percentage of Net revenues	100.00%	100.00%	100.00%	100.00%
Automotive [Member]
Property, Plant and Equipment [Line Items]
Net license revenues	$ 248	$ 457	$ 1,151	$ 1,714
Percentage of Net license revenues	13.00%	20.00%	19.00%	25.00%
Consumer electronics [Member]
Property, Plant and Equipment [Line Items]
Net license revenues	$ 1,349	$ 1,615	$ 4,530	$ 4,444
Percentage of Net license revenues	70.00%	70.00%	73.00%	64.00%
Sensor modules [Member]
Property, Plant and Equipment [Line Items]
Net revenues	$ 39	$ 211	$ 176	$ 634
Percentage of Net revenues	2.00%	9.00%	3.00%	9.00%
Non-recurring engineering [Member]
Property, Plant and Equipment [Line Items]
Net revenues	$ 287	$ 22	$ 317	$ 174
Percentage of Net revenues	15.00%	1.00%	5.00%	2.00%