Geographic and Segment Information - Revenues by Geographic Location (Detail) (USD $) In Thousands, 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
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 15,214	$ 14,108	$ 12,704	$ 12,488	$ 13,129	$ 12,612	$ 11,833	$ 11,294	$ 54,514	$ 48,868	$ 45,930
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									12,202	11,182	10,409
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									8,810	10,024	9,937
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									10,287	7,925	5,959
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									9,424	7,358	8,866
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									4,684	4,196	3,865
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									4,658	3,770	2,671
Sweden [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									2,046	2,206	2,170
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 2,403	$ 2,207	$ 2,053
Sales [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of Revenue									100.00%	100.00%	100.00%
Sales [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of Revenue									22.30%	22.90%	22.70%
Sales [Member] | Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of Revenue									16.20%	20.50%	21.60%
Sales [Member] | Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of Revenue									18.90%	16.20%	13.00%
Sales [Member] | France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of Revenue									17.30%	15.10%	19.30%
Sales [Member] | Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of Revenue									8.60%	8.60%	8.40%
Sales [Member] | United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of Revenue									8.50%	7.70%	5.80%
Sales [Member] | Sweden [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of Revenue									3.80%	4.50%	4.70%
Sales [Member] | Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of Revenue									4.40%	4.50%	4.50%