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Major Customers (Details) - customer | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Sales Revenue, Goods, Net |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of customers | 1 | 1 | 1 | 1 |
Concentration risk (as a percent) (more than for 10.0%) | 10.00% | 10.00% | 10.00% | 10.00% |
Customer Concentration Risk | Sales Revenue, Goods, Net |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of customers | 5 | 5,000,000 | 5 | 5,000,000 |
Concentration risk (as a percent) (more than for 10.0%) | 40.60% | 35.10% | 39.60% | 33.60% |
Credit Concentration Risk | Accounts Receivable |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of customers |  |  | 5 |  |
Concentration risk (as a percent) (more than for 10.0%) |  |  | 35.60% |  | 32.00%

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