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Major Customers (Details) - customer | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Customer Concentration Risk | Sales Revenue, Goods, Net |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of customers | 5 | 5 | 5 | 5,000,000 |
Concentration risk (as a percent) (more than for 10.0%) | 40.40% | 42.80% |  |  |
Customer Concentration Risk | Accounts Receivable |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of customers |  |  | 5 |  | 5
Credit Concentration Risk | Sales Revenue, Goods, Net |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk (as a percent) (more than for 10.0%) |  |  | 40.50% |  | 42.00%
Credit Concentration Risk | Accounts Receivable |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk (as a percent) (more than for 10.0%) |  |  | 40.90% | 41.90% | 37.70%
North America | Sales Revenue, Goods, Net |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of customers | 1 | 1 | 1 | 1 |
North America | Customer Concentration Risk | Sales Revenue, Goods, Net |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of customers | 5 | 5 | 5 | 5 |
Concentration risk (as a percent) (more than for 10.0%) | 23.80% | 25.80% | 22.40% | 24.00% |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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