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Major customers (Details)
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3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2013
item
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Sep. 30, 2012
item
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Sep. 30, 2013
item
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Sep. 30, 2012
item
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Purchases | Vendor concentration risk | One major vendor
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| Significant Customers | ||||
| Number of vendors | 1 | 1 | 1 | 1 |
| Percentage of concentration risk | 10.40% | 13.60% | 10.00% | 14.50% |
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Net sales | Customer concentration risk
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| Significant Customers | ||||
| Number of customers | 3 | 3 | 3 | 3 |
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Net sales | Customer one | Customer concentration risk
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| Significant Customers | ||||
| Percentage of concentration risk | 15.00% | 12.50% | 15.00% | 13.10% |
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Net sales | Customer two | Customer concentration risk
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| Significant Customers | ||||
| Percentage of concentration risk | 15.00% | 14.40% | 14.30% | 13.60% |
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Net sales | Customer three | Customer concentration risk
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| Significant Customers | ||||
| Percentage of concentration risk | 11.80% | 10.40% | 11.90% | 11.60% |
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Net accounts receivable | Customer one | Customer concentration risk
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| Significant Customers | ||||
| Percentage of concentration risk | 11.70% | |||
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Net accounts receivable | Customer two | Customer concentration risk
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| Significant Customers | ||||
| Percentage of concentration risk | 13.90% | |||
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Net accounts receivable | Customer three | Customer concentration risk
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| Significant Customers | ||||
| Percentage of concentration risk | 10.50% | |||