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Major customers (Details)
|
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
|
|
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Purchases | Vendor concentration risk
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| Significant Customers | ||||
| Number of vendors | 1 | 1 | ||
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Purchases | Vendor concentration risk | One major vendor
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| Significant Customers | ||||
| Percentage of concentration risk | 13.60% | 12.00% | 14.50% | 11.90% |
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Net sales | Customer concentration risk
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| Significant Customers | ||||
| Number of customers | 3 | 3 | ||
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Net sales | Customer concentration risk | Customer one
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| Significant Customers | ||||
| Percentage of concentration risk | 12.50% | 14.40% | 13.10% | 14.50% |
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Net sales | Customer concentration risk | Customer two
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| Significant Customers | ||||
| Percentage of concentration risk | 14.40% | 12.00% | 13.60% | 11.20% |
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Net sales | Customer concentration risk | Customer three
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| Significant Customers | ||||
| Percentage of concentration risk | 10.40% | 10.10% | 11.60% | 10.70% |
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Net accounts receivable | Customer concentration risk | Customer one
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| Significant Customers | ||||
| Percentage of concentration risk | 12.10% | |||
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Net accounts receivable | Customer concentration risk | Customer two
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| Significant Customers | ||||
| Percentage of concentration risk | 8.70% | |||
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Net accounts receivable | Customer concentration risk | Customer three
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| Significant Customers | ||||
| Percentage of concentration risk | 8.30% | |||