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Major Customers (Details) - customer | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 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%) | 41.00% | 34.40% | 39.00% | 32.90%
Credit Concentration Risk | Accounts Receivable |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of customers |  |  | 5 |
Concentration risk (as a percent) (more than for 10.0%) |  |  | 39.60% | 32.00%

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