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Significant Customers and Geographic Information (Details)
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3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Oct. 31, 2012
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Oct. 31, 2011
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Oct. 31, 2012
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Oct. 31, 2011
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Customer A [Member]
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| Entity-Wide Revenue, Major Customer, Percentage | 19.00% | 26.00% | 19.00% | 26.00% |
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Customer B [Member]
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| Entity-Wide Revenue, Major Customer, Percentage | 11.00% | 12.00% | 11.00% | 11.00% |
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Customer C [Member]
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| Entity-Wide Revenue, Major Customer, Percentage | 11.00% | |||
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Customer D [Member]
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| Entity-Wide Revenue, Major Customer, Percentage | 10.00% | |||