Goodwill and Other Intangible Assets - Goodwill and Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 31, 2013	Jan. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 4,320	$ 4,320
Gross Carrying Amount	6,721	6,826
Accumulated Amortization	(3,274)	(2,837)
Net Carrying Amount	3,447	3,989
Proprietary Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	6 years 8 months 12 days
Gross Carrying Amount	3,537	3,503
Accumulated Amortization	(1,814)	(1,625)
Net Carrying Amount	1,723	1,878
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	4 years 3 months 18 days
Gross Carrying Amount	2,302	2,402
Accumulated Amortization	(1,055)	(876)
Net Carrying Amount	1,247	1,526
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	4 years 3 months 18 days
Gross Carrying Amount	693	724
Accumulated Amortization	(318)	(264)
Net Carrying Amount	375	460
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	4 years 3 months 18 days
Gross Carrying Amount	189	197
Accumulated Amortization	(87)	(72)
Net Carrying Amount	$ 102	$ 125