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Segment Information and Concentrations - Major customers (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Ingram Micro Inc.
Percent of revenues	19.00%	13.00%	17.00%	15.00%
Threshold percentage for disclosure	10.00%	10.00%	10.00%	10.00%
ScanSource, Inc.
Percent of revenues	18.00%	14.00%	20.00%	12.00%
Threshold percentage for disclosure	10.00%	10.00%	10.00%	10.00%
Epocal, Inc.
Percent of revenues		11.00%		16.00%
Threshold percentage for disclosure	10.00%	10.00%	10.00%	10.00%

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- Definition

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

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