Significant Customers (Details Textual) - customer	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Significant Customers (Textual) [Abstract]
Numbers of customers	1	2
Significant Customers
Revenues attributable to sales [Line Items]
Total	29.60%	42.00%
Significant Customers | Avnet
Revenues attributable to sales [Line Items]
Total	29.60%	26.80%
Significant Customers | Enel
Revenues attributable to sales [Line Items]
Total	0.00%	15.20%