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Employee Benefits and Stock-Based Compensation - Classification of Stock-Based Compensation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Stock-based compensation:
Total Stock-based compensation	$ 4,999	$ 3,616	$ 1,856
Cost of revenue [Member]
Stock-based compensation:
Total Stock-based compensation	92	52	41
Research and development [Member]
Stock-based compensation:
Total Stock-based compensation	2,942	1,821	1,058
Selling, general and administrative [Member]
Stock-based compensation:
Total Stock-based compensation	$ 1,965	$ 1,743	$ 757

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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