|
Major customers (Details)
|
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2013
item
|
Mar. 31, 2012
item
|
|
|
Purchases | Vendor concentration risk
|
||
| Significant Customers | ||
| Number of vendors | 1 | 1 |
|
Purchases | Vendor concentration risk | One major vendor
|
||
| Significant Customers | ||
| Percentage of concentration risk | 10.40% | 15.60% |
|
Net sales | Customer concentration risk
|
||
| Significant Customers | ||
| Number of customers | 3 | 3 |
|
Net sales | Customer one | Customer concentration risk
|
||
| Significant Customers | ||
| Percentage of concentration risk | 14.50% | 13.10% |
|
Net sales | Customer two | Customer concentration risk
|
||
| Significant Customers | ||
| Percentage of concentration risk | 14.40% | 10.50% |
|
Net sales | Customer three | Customer concentration risk
|
||
| Significant Customers | ||
| Percentage of concentration risk | 11.30% | 11.60% |
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Net accounts receivable | Customer one | Customer concentration risk
|
||
| Significant Customers | ||
| Percentage of concentration risk | 13.20% | |
|
Net accounts receivable | Customer two | Customer concentration risk
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||
| Significant Customers | ||
| Percentage of concentration risk | 12.10% | |
|
Net accounts receivable | Customer three | Customer concentration risk
|
||
| Significant Customers | ||
| Percentage of concentration risk | 8.40% | |