Commitments and Contingencies - Schedule of Non-Cancelable Minimum Payments Applicable to Operating and Capital Leases (Details) $ in Thousands	Jul. 31, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Operating Leases, due in one year	$ 743
Operating Leases, due in two years	436
Operating Leases, due in three years	441
Operating Leases, due in four years	405
Operating Leases, due in five years	373
Operating Leases, due thereafter	2,724
Operating Leases, future minimum payments due	5,122
Capital Leases, future minimum payments due, next twelve months	138
Capital Leases, future minimum payments due in two years	47
Capital Leases, future minimum payments due in three years	10
Capital Leases, future minimum payments due in four years	0
Capital Leases, future minimum payments due in five years	0
Capital Leases, future minimum payments due thereafter	0
Capital Leases, future minimum payments due	$ 195