Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Property, Plant and Equipment [Line Items]
Net license revenues	$ 1,761	$ 1,965	$ 4,084	$ 4,086
Net revenues	$ 1,876	$ 2,329	$ 4,251	$ 4,661
Percentage of Net revenues	100.00%	100.00%	100.00%	100.00%
Automotive [Member]
Property, Plant and Equipment [Line Items]
Net license revenues	$ 385	$ 661	$ 904	$ 1,258
Percentage of Net license revenues	21.00%	28.00%	21.00%	27.00%
Consumer electronics [Member]
Property, Plant and Equipment [Line Items]
Net license revenues	$ 1,376	$ 1,304	$ 3,180	$ 2,828
Percentage of Net license revenues	73.00%	56.00%	75.00%	61.00%
Sensor modules [Member]
Property, Plant and Equipment [Line Items]
Net revenues	$ 85	$ 213	$ 137	$ 423
Percentage of Net revenues	4.00%	9.00%	3.00%	9.00%
Non-recurring engineering [Member]
Property, Plant and Equipment [Line Items]
Net revenues	$ 30	$ 151	$ 30	$ 152
Percentage of Net revenues	2.00%	7.00%	1.00%	3.00%