Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jul. 31, 2020		Jul. 31, 2019	Jul. 31, 2020		Jul. 31, 2019	Feb. 01, 2020	Jan. 31, 2020	[1]
Lessee, Lease, Description [Line Items]
Operating lease, weighted average remaining lease term	2 years 6 months			2 years 6 months
Operating lease, weighted average discount rate	3.50%			3.50%
Finance lease, weighted average remaining lease term	2 years 9 months 18 days			2 years 9 months 18 days
Finance lease, weighted average discount rate	6.10%			6.10%
Lease right-of-use assets	$ 2,406	[1]		$ 2,406	[1]		$ 2,741	$ 0
Operating cash used for operating leases				800
Subscription and Related Services
Lessee, Lease, Description [Line Items]
Lease income	$ 1,585		$ 1,506	$ 3,139		$ 2,966
Minimum | Computer equipment
Lessee, Lease, Description [Line Items]
Finance lease, term of contract	2 years			2 years
Maximum | Computer equipment
Lessee, Lease, Description [Line Items]
Finance lease, term of contract	3 years			3 years

[1] Figures as of July 31, 2020 reflect the Company's February 1, 2020 adoption of Accounting Standards Update ("ASU") No. 2016-02, Leases. For additional details, see Note 3(c), "Summary of significant accounting policies — Impact of recently adopted accounting pronouncements."