Goodwill and Other Intangible Assets - Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Goodwill, Gross Carrying Amount	$ 7,060	$ 7,060
Goodwill Impairment	(4,529)	(3,063)
Goodwill, Net Carrying Amount	2,531	3,997	$ 4,155
Gross Carrying Amount	15,259	14,411
Accumulated Amortization	(7,244)	(5,399)
Net Carrying Amount	$ 8,015	9,012	$ 10,466
Proprietary rights
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life	4 years 10 months 9 days
Gross Carrying Amount	$ 6,181	5,810
Accumulated Amortization	(3,663)	(3,003)
Net Carrying Amount	$ 2,518	2,807
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life	3 years 9 months 16 days
Gross Carrying Amount	$ 5,024	4,679
Accumulated Amortization	(2,464)	(1,656)
Net Carrying Amount	$ 2,560	3,023
Patents
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life	5 years
Gross Carrying Amount	$ 1,730	1,608
Accumulated Amortization	(778)	(558)
Net Carrying Amount	$ 952	1,050
Trade name
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life	8 years 3 months 16 days
Gross Carrying Amount	$ 894	884
Accumulated Amortization	(41)	(27)
Net Carrying Amount	$ 853	857
Developed technology
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life	7 years 10 months 16 days
Gross Carrying Amount	$ 1,430	1,430
Accumulated Amortization	(298)	(155)
Net Carrying Amount	$ 1,132	$ 1,275