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Leases - ASC 842 Minimum Lease Payments (Details) - USD ($) $ in Thousands | Jul. 31, 2020 | Jan. 31, 2020 | Jul. 31, 2019
--- | --- | --- | ---
Leases [Abstract] |  |  |
Remaining of 2021 | $ 2,942 |  |
2022 | 5,757 |  |
2023 | 5,323 |  |
2024 | 5,225 |  |
2025 | 5,370 |  |
Thereafter | 1,350 |  |
Remaining balance of lease payments | 25,967 |  |
Short-term lease liabilities | 4,581 | $ 3,654 | $ 3,275
Long-term lease liabilities | 17,798 | $ 19,787 | $ 21,598
Total lease liabilities | 22,379 |  |
Difference between undiscounted cash flows and discounted cash flows | $ 3,588 |  |

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