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Leases - ASC 842 Minimum Lease Payments (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019	Apr. 30, 2018
Leases [Abstract]
Remaining of 2020	$ 3,878
2021	4,561
2022	5,188
2023	5,042
2024	5,192
Thereafter	6,687
Remaining balance of lease payments	30,548
Short-term lease liabilities	2,939	$ 0	$ 0
Long-term lease liabilities	22,221	$ 0	$ 0
Total lease liabilities	25,160
Difference between undiscounted cash flows and discounted cash flows	$ 5,388

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