Property and Equipment, Net - Schedule of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Jan. 31, 2013
Property Plant And Equipment [Abstract]
Computer equipment and software	$ 2,867	$ 2,810
Machinery and equipment	2,063	2,050
Furniture and fixtures	397	397
Leasehold improvements	642	642
Construction in progress	1,370	827
Property and equipment, gross	7,339	6,726
Less: accumulated depreciation and amortization	(4,363)	(4,190)
Total property and equipment, net	$ 2,976	$ 2,536

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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