Intangible Assets - Details of Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Oct. 31, 2018	Jan. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	$ 54,470	$ 54,470
Intangible assets, Accumulated amortization	(28,282)	(22,980)
Intangible assets, Net	26,188	31,490	[1]
Existing technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	3,880	3,880
Intangible assets, Accumulated amortization	(3,823)	(3,509)
Intangible assets, Net	$ 57	$ 371
Intangible assets, Remaining useful life	1 year 8 months 12 days	9 months 18 days
Database [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	$ 4,939	$ 4,939
Intangible assets, Accumulated amortization	(4,431)	(4,091)
Intangible assets, Net	$ 508	$ 848
Intangible assets, Remaining useful life	1 year 8 months 12 days	2 years
Customer contracts and relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	$ 33,643	$ 33,643
Intangible assets, Accumulated amortization	(11,455)	(8,798)
Intangible assets, Net	$ 22,188	$ 24,845
Intangible assets, Remaining useful life	7 years 1 month 6 days	7 years 6 months
Software [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	$ 10,867	$ 10,867
Intangible assets, Accumulated amortization	(7,567)	(5,820)
Intangible assets, Net	$ 3,300	$ 5,047
Intangible assets, Remaining useful life	1 year 8 months 12 days	2 years 2 months 12 days
Brand [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	$ 1,141	$ 1,141
Intangible assets, Accumulated amortization	(1,006)	(762)
Intangible assets, Net	$ 135	$ 379
Intangible assets, Remaining useful life	8 months 12 days	1 year 2 months 12 days

[1] See note 1 of the notes to the condensed consolidated financial statements for a summary of adjustments.