Goodwill and Other Intangible Assets - Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	Jan. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 4,226	$ 4,155	$ 2,600
Gross Carrying Amount	15,076	14,517
Accumulated Amortization	(4,575)	(4,051)
Net Carrying Amount	$ 10,501	10,466
Proprietary Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	6 years 7 months 6 days
Gross Carrying Amount	$ 6,156	5,959
Accumulated Amortization	(2,818)	(2,645)
Net Carrying Amount	$ 3,338	3,314
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	5 years 7 months 6 days
Gross Carrying Amount	$ 4,896	4,633
Accumulated Amortization	(1,233)	(1,006)
Net Carrying Amount	$ 3,663	3,627
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	6 years 7 months 6 days
Gross Carrying Amount	$ 1,684	1,592
Accumulated Amortization	(449)	(369)
Net Carrying Amount	$ 1,235	1,223
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	10 years 1 month 6 days
Gross Carrying Amount	$ 890	883
Accumulated Amortization	(20)	(17)
Net Carrying Amount	$ 870	866
Customer Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	8 months 12 days
Gross Carrying Amount	$ 20	20
Accumulated Amortization	(7)	(2)
Net Carrying Amount	$ 13	18
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	9 years 8 months 12 days
Gross Carrying Amount	$ 1,430	1,430
Accumulated Amortization	(48)	(12)
Net Carrying Amount	$ 1,382	$ 1,418