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Major customers (Details)
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3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2013
item
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Jun. 30, 2012
item
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Jun. 30, 2013
item
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Jun. 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 | ||
| Percentage of concentration risk | 14.50% | 14.60% | ||
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Purchases | Vendor concentration risk | Two major vendor
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| Significant Customers | ||||
| Number of vendors | 2 | 2 | 2 | 2 |
| Percentage of concentration risk | 13.50% | 10.90% | 10.90% | 9.70% |
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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 | 15.60% | 13.70% | 15.00% | 13.40% |
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Net sales | Customer two | Customer concentration risk
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| Significant Customers | ||||
| Percentage of concentration risk | 13.30% | 15.90% | 13.90% | 13.30% |
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Net sales | Customer three | Customer concentration risk
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| Significant Customers | ||||
| Percentage of concentration risk | 12.60% | 13.00% | 12.00% | 12.30% |
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Net accounts receivable | Customer one | Customer concentration risk
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| Significant Customers | ||||
| Percentage of concentration risk | 13.90% | |||
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Net accounts receivable | Customer two | Customer concentration risk
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| Significant Customers | ||||
| Percentage of concentration risk | 11.60% | |||
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Net accounts receivable | Customer three | Customer concentration risk
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| Significant Customers | ||||
| Percentage of concentration risk | 9.20% | |||