Revenue - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Revenue From Contract With Customer [Line Items]
Capitalized contract cost, amortization period	3 years		3 years
Capitalized contract cost, amortization	$ 505,000	$ 491,000	$ 2,280,000	$ 1,465,000
Capitalized contract cost, impairment loss	0	0	0	0
Subscription and Related Services
Revenue From Contract With Customer [Line Items]
Lease income	$ 1,593,000	$ 1,496,000	$ 4,732,000	$ 4,462,000