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Concentration of Major Suppliers (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Concentration Risk [Line Items]
Number of major suppliers	2	2	2	2
Supplier A [Member]
Concentration Risk [Line Items]
Percentage of total purchase from major suppliers	76.00%	75.00%	76.00%	77.00%
Supplier B [Member]
Concentration Risk [Line Items]
Percentage of total purchase from major suppliers	8.00%	5.00%	7.00%	10.00%

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- Definition

Number of Suppliers

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X

- Definition

Percentage of Purchases from Major Suppliers

+ References

No definition available.

+ Details

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- Details

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