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Leases - ASC 842 Quantitative Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Leases [Abstract]
Operating lease cost	$ 1,238	$ 1,440
Short-term lease cost	96	36
Short-term sublease income	(10)	(10)
Variable lease cost	530	455
Total lease cost	1,854	1,921
Cash paid for amounts included in the measurement of lease liabilities	1,328	662
Right-of-use assets obtained in exchange for new lease liabilities	$ 165	$ 270
Weighted-average remaining lease term (years)	3 years 9 months 18 days	4 years 8 months 12 days
Weighted-average discount rate	6.40%	6.40%

X

- Definition

Amount of increase in lease obligation from new lease.

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- Definition

Amount of lease cost recognized by lessee for lease contract.

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Cash payments to lessor's for use of assets under operating leases.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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Amount of sublease income excluding finance and operating lease expense.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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