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Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2020
Apr. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash outflows from operating leases $ 122 $ 306
ROU assets obtained in exchange for new operating lease liabilities $ 0 $ 0