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Segment Information (Accounts Receivable by Major Customer) (Details) - Accounts Receivable
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Account X    
Segment Reporting Information    
Percentage of accounts receivable 55.00% 37.00%
Account Y    
Segment Reporting Information    
Percentage of accounts receivable 16.00% 15.00%
Account Z    
Segment Reporting Information    
Percentage of accounts receivable 0.00% 16.00%