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Major Customers (Details) - customer | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Customer Concentration Risk | Sales Revenue, Goods, Net |  |  |
Concentration Risk [Line Items] |  |  |
Number of customers | 5 |  | 5,000,000
Concentration risk (as a percent) (more than for 10.0%) | 40.60% | 41.20% |
Customer Concentration Risk | Accounts Receivable |  |  |
Concentration Risk [Line Items] |  |  |
Number of customers | 5 |  | 5
Credit Concentration Risk | Accounts Receivable |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk (as a percent) (more than for 10.0%) | 37.80% |  | 37.70%
North America | Sales Revenue, Goods, Net |  |  |
Concentration Risk [Line Items] |  |  |
Number of customers | 1 |  | 1
North America | Customer Concentration Risk | Sales Revenue, Goods, Net |  |  |
Concentration Risk [Line Items] |  |  |
Number of customers | 5 |  | 5
Concentration risk (as a percent) (more than for 10.0%) | 20.80% | 22.20% |

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