Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands		Apr. 30, 2020		Feb. 01, 2020	Jan. 31, 2020
Operating leases:
Lease right-of-use assets		$ 2,795	[1]	$ 2,741	$ 0	[1]
Lease liabilities	[1]	1,414			0
Lease liabilities, noncurrent	[1]	1,578			0
Total operating lease liabilities		2,992		$ 2,928
Finance leases:
Property and equipment, at cost		13,110
Accumulated depreciation		(8,449)
Property and equipment, net		4,661
Lease liabilities	[1]	2,366			2,324
Lease liabilities, noncurrent	[1]	2,234			$ 2,096
Total finance lease liabilities		$ 4,600

[1] (1) Figures as of April 30, 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."