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Summary of Significant Accounting Policies Concentration of Credit Risk (Details)
Dec. 31, 2015
Dec. 31, 2014
Percentage of accounts receivable total 31.10% 27.60%
Enel [Member] [Member]    
Percentage of accounts receivable 18.20% 3.60%
Ebv Avnet [Member]    
Percentage of accounts receivable 12.90% 24.00%