Summary of Significant Accounting Policies - Reclassification Reflected in Current Statements of Operations and Comprehensive Loss (Detail)

v2.4.0.8

Summary of Significant Accounting Policies - Reclassification Reflected in Current Statements of Operations and Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Basis of Presentation [Line Items]
Prior period reclassification adjustment
Cost of Revenue - Product [Member]
Basis of Presentation [Line Items]
Prior period reclassification adjustment	(229)	(156)
Cost of Revenue - Service [Member]
Basis of Presentation [Line Items]
Prior period reclassification adjustment	(1,139)	(1,132)
Research and Development Expenses [Member]
Basis of Presentation [Line Items]
Prior period reclassification adjustment	(960)	(1,031)
Selling and Marketing Expenses [Member]
Basis of Presentation [Line Items]
Prior period reclassification adjustment	(208)	(254)
General and Administrative Expenses [Member]
Basis of Presentation [Line Items]
Prior period reclassification adjustment	$ 2,536	$ 2,573