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Balance Sheet - Schedule of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2015
Jan. 31, 2015
Inventories:    
Raw materials $ 6,319us-gaap_InventoryRawMaterials $ 6,718us-gaap_InventoryRawMaterials
Finished goods 5,754us-gaap_InventoryFinishedGoods 4,466us-gaap_InventoryFinishedGoods
Work in progress 1,252us-gaap_InventoryWorkInProcess 1,017us-gaap_InventoryWorkInProcess
Cost of inventories 13,325us-gaap_InventoryGross 12,201us-gaap_InventoryGross
Less allowance for obsolescence (817)us-gaap_InventoryValuationReserves (750)us-gaap_InventoryValuationReserves
Total inventories, net $ 12,508us-gaap_InventoryNet $ 11,451us-gaap_InventoryNet