Leases - ASC 842 Minimum Lease Payments (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020	Oct. 31, 2019
Leases [Abstract]
Remaining of 2021	$ 1,476
2022	5,818
2023	5,384
2024	5,251
2025	5,370
Thereafter	1,350
Remaining balance of lease payments	24,649
Short-term lease liabilities	4,662	$ 3,654	$ 3,506
Long-term lease liabilities	16,745	$ 19,787	$ 20,778
Total lease liabilities	21,407
Difference between undiscounted cash flows and discounted cash flows	$ 3,242