Intangible Assets - Details of Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Oct. 31, 2019	Jan. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 53,329	$ 54,470
Accumulated amortization	(33,381)	(29,949)
Intangible assets, net	19,948	24,521
Existing technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	3,880	3,880
Accumulated amortization	(3,863)	(3,834)
Intangible assets, net	$ 17	$ 46
Remaining useful life (in years)	4 months 24 days	1 year 2 months 12 days
Database
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 4,939	$ 4,939
Accumulated amortization	(4,789)	(4,521)
Intangible assets, net	$ 150	$ 418
Remaining useful life (in years)	4 months 24 days	1 year 2 months 12 days
Customer contracts and relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 33,643	$ 33,643
Accumulated amortization	(14,829)	(12,350)
Intangible assets, net	$ 18,814	$ 21,293
Remaining useful life (in years)	5 years 10 months 24 days	6 years 7 months 6 days
Software
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 10,867	$ 10,867
Accumulated amortization	(9,900)	(8,156)
Intangible assets, net	$ 967	$ 2,711
Remaining useful life (in years)	4 months 24 days	1 year 2 months 12 days
Brand
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		$ 1,141
Accumulated amortization		(1,088)
Intangible assets, net		$ 53
Remaining useful life (in years)	0 days	2 months 12 days