Significant Customers (Details Textual) - customer	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Significant Customers (Textual) [Abstract]
Numbers of customers	2	2
Revenues attributable to sales [Line Items]
Percentage of net revenue	40.40%	34.80%
Avnet
Revenues attributable to sales [Line Items]
Percentage of net revenue	27.30%	25.30%
Engenuity
Revenues attributable to sales [Line Items]
Percentage of net revenue	13.10%	9.50%