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Leases - ASC 842 Minimum Lease Payments (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Jan. 31, 2019	Jul. 31, 2018
Leases [Abstract]
Remaining of 2020	$ 2,690
2021	4,820
2022	5,435
2023	5,085
2024	5,192
Thereafter	6,687
Remaining balance of lease payments	29,909
Short-term lease liabilities	3,275	$ 0	$ 0
Long-term lease liabilities	21,598	$ 0	$ 0
Total lease liabilities	24,873
Difference between undiscounted cash flows and discounted cash flows	$ 5,036

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