Quarterly Results of Operations - Operating Results for Interim Periods (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
License revenue	$ 12,047	$ 11,121	$ 10,719	$ 10,692	$ 10,606	$ 10,317	$ 10,215	$ 10,013	$ 44,579	$ 41,151	$ 38,754
Project revenue	3,167	2,987	1,985	1,796	2,523	2,295	1,618	1,281	9,935	7,717	7,176
Total revenues	15,214	14,108	12,704	12,488	13,129	12,612	11,833	11,294	54,514	48,868	45,930
Operating expenses:
Cost of revenues	4,432	4,023	3,833	3,671	4,175	3,644	3,112	3,223	15,959	14,154	12,075
Sales and marketing	3,004	2,243	2,179	2,117	2,277	1,529	1,709	1,600	9,543	7,115	6,233
Research and development	4,976	4,428	4,450	4,386	4,277	4,113	4,157	4,140	18,240	16,687	14,449
General and administrative	2,961	2,736	2,426	2,771	2,591	2,435	1,968	1,958	10,894	8,952	8,138
Total operating expenses	15,373	13,430	12,888	12,945	13,320	11,721	10,946	10,921	54,636	46,908	40,895
(Loss) income from operations	(159)	678	(184)	(457)	(191)	891	887	373	(122)	1,960	5,035
Other (expense) income, net:
Foreign exchange gain (loss)	(58)	31	(93)	37	(194)	(115)	326		(83)	17	(106)
Interest expense, net	(64)	(67)	(171)	(377)	(408)	(402)	(409)	(412)
Other income (expense), net	3	2	(752)	2	16	2	445	66	10	529	(213)
Total other expense, net	(119)	(34)	(1,016)	(338)	(586)	(515)	362	(346)	(1,507)	(1,085)	(1,603)
(Loss) income before income taxes	(278)	644	(1,200)	(795)	(777)	376	1,249	27	(1,629)	875	3,432
Benefit (provision) for income taxes	392	(128)	402	254	437	(217)	(367)	35	920	(112)	10,706
Net (loss) income	$ 114	$ 516	$ (798)	$ (541)	$ (340)	$ 159	$ 882	$ 62	$ (709)	$ 763	$ 14,138
Basic (loss) income per share	$ 0.01	$ 0.04	$ (0.06)	$ (0.04)	$ (0.03)	$ 0.01	$ 0.20	$ 0.12	$ (0.05)	$ 0.10	$ 28.63
Diluted (loss) income per share	$ 0.01	$ 0.04	$ (0.06)	$ (0.04)	$ (0.03)	$ 0.01	$ 0.70	$ 0.01	$ (0.05)	$ 0.06	$ 1.37