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Segment Information and Concentrations of Risk (Details 2)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net revenues by geographic region
Net revenues by geographic region	100.00%	100.00%
United States and Canada [Member]
Net revenues by geographic region
Net revenues by geographic region	95.20%	91.60%
Latin America [Member]
Net revenues by geographic region
Net revenues by geographic region	0.40%	4.50%
Europe, Middle East and Africa [Member]
Net revenues by geographic region
Net revenues by geographic region	4.20%	3.30%
Asia and Australia [Member]
Net revenues by geographic region
Net revenues by geographic region	0.20%	0.60%

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- Definition

Revenue from external customers by geographic region.

+ References

No definition available.

+ Details

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