Stock Based Compensation - Stock-Based Compensation Expense Related to Stock Options Issued by the Company (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Stock Based Compensation [Line Items]
Stock-based compensation expense	$ 350	$ 235	$ 846	$ 710
Cost of Revenues [Member]
Stock Based Compensation [Line Items]
Stock-based compensation expense	35	28	99	82
Sales and Marketing [Member]
Stock Based Compensation [Line Items]
Stock-based compensation expense	67	49	169	143
Research and Development [Member]
Stock Based Compensation [Line Items]
Stock-based compensation expense	110	75	264	232
General and Administrative [Member]
Stock Based Compensation [Line Items]
Stock-based compensation expense	$ 138	$ 83	$ 314	$ 253