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Leases - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ (309) $ (293)
Right-of-use assets obtained in exchange for lease liabilities:    
Operating leases $ 309 $ 293