Unaudited statements of cash flows (Parenthetical) - USD ($) $ in Thousands	Oct. 31, 2020		Feb. 01, 2020	Jan. 31, 2020
Statement of Cash Flows [Abstract]
Lease right-of-use assets	$ 3,192	[1]	$ 2,741	$ 0	[1]

[1] Figures as of October 31, 2020 reflect the Company's February 1, 2020 adoption of Accounting Standards Codification No. 842, Leases (ASC 842). For additional details, see Note 3(c), "Summary of significant accounting policies — Impact of recently adopted accounting pronouncements."