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Segment Information and Concentrations - Major customers as a percentage of net accounts receivable balances (Details)	Mar. 31, 2013	Mar. 31, 2012
Company A
Percent of net accounts receivable balances	23.00%	28.00%
Threshold percentage for disclosure	10.00%	10.00%
Company B
Percent of net accounts receivable balances	18.00%	12.00%
Threshold percentage for disclosure	10.00%	10.00%
Company C
Percent of net accounts receivable balances	16.00%	16.00%
Threshold percentage for disclosure	10.00%	10.00%
Company D
Percent of net accounts receivable balances	14.00%	11.00%
Threshold percentage for disclosure	10.00%	10.00%
Company E
Percent of net accounts receivable balances		12.00%
Threshold percentage for disclosure	10.00%	10.00%

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- Definition

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+ Details

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