Goodwill and Other Intangible Assets - Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 3,997	$ 4,155	$ 5,594
Gross Carrying Amount	14,431	14,517
Accumulated Amortization	(5,419)	(4,051)
Net Carrying Amount	$ 9,012	10,466	$ 10,831
Proprietary Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	5 years 10 months 24 days
Gross Carrying Amount	$ 5,810	5,959
Accumulated Amortization	(3,003)	(2,645)
Net Carrying Amount	$ 2,807	3,314
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	4 years 9 months 18 days
Gross Carrying Amount	$ 4,679	4,633
Accumulated Amortization	(1,656)	(1,006)
Net Carrying Amount	$ 3,023	3,627
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	5 years 10 months 24 days
Gross Carrying Amount	$ 1,608	1,592
Accumulated Amortization	(558)	(369)
Net Carrying Amount	$ 1,050	1,223
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	9 years 3 months 18 days
Gross Carrying Amount	$ 884	883
Accumulated Amortization	(27)	(17)
Net Carrying Amount	$ 857	866
Customer Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	0 years
Gross Carrying Amount	$ 20	20
Accumulated Amortization	$ (20)	(2)
Net Carrying Amount		18
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	8 years 10 months 24 days
Gross Carrying Amount	$ 1,430	1,430
Accumulated Amortization	(155)	(12)
Net Carrying Amount	$ 1,275	$ 1,418