Goodwill and Other Intangible Assets - Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Jan. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 3,997	$ 3,997
Gross Carrying Amount	14,529	14,411
Accumulated Amortization	(5,809)	(5,399)
Net Carrying Amount	$ 8,720	9,012
Proprietary Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	5 years 7 months 6 days
Gross Carrying Amount	$ 5,872	5,810
Accumulated Amortization	(3,154)	(3,003)
Net Carrying Amount	$ 2,718	2,807
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	4 years 7 months 6 days
Gross Carrying Amount	$ 4,720	4,679
Accumulated Amortization	(1,831)	(1,656)
Net Carrying Amount	$ 2,889	3,023
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	5 years 7 months 6 days
Gross Carrying Amount	$ 1,622	1,608
Accumulated Amortization	(604)	(558)
Net Carrying Amount	$ 1,018	1,050
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	9 years 1 month 6 days
Gross Carrying Amount	$ 885	884
Accumulated Amortization	(29)	(27)
Net Carrying Amount	$ 856	857
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	8 years 8 months 12 days
Gross Carrying Amount	$ 1,430	1,430
Accumulated Amortization	(191)	(155)
Net Carrying Amount	$ 1,239	$ 1,275