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Property and Equipment - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 61 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2019 USD ($) asset | Jul. 31, 2018 USD ($) | Jan. 31, 2021 USD ($) | Jan. 31, 2020 USD ($) | Jan. 31, 2021 USD ($) | Jan. 31, 2020 USD ($) | Nov. 30, 2020 USD ($) | Nov. 30, 2019 USD ($) | Apr. 30, 2020 USD ($) | Feb. 01, 2019 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  | $ 279,000 | $ 184,000 | $ 757,000 | $ 491,000 |  |  |  |
Finance lease, asset, gross |  |  | 343,000 |  | 343,000 |  |  |  | $ 343,000 |
Finance lease, amortization |  |  | 18,000 | 35,000 | 124,000 | 88,000 |  |  |  |
Finance lease costs |  | $ 266,000 |  |  |  |  | $ 231,000 | $ 149,000 |  |
Future minimum lease payments remaining |  |  |  | 2,000 | 173,000 | 51,000 |  |  |  |
Assets under finance lease |  |  | 0 |  | 0 |  |  |  |  | $ 0
Finance leases monthly payments |  | $ 11,000 |  |  |  |  |  |  |  |
Gain on disposal of equipment |  |  |  |  | 0 | 52,000 |  |  |  |
Number of right of use assets acquired | asset | 2 |  |  |  |  |  |  |  |  |
Traded in Assets |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Assets under finance lease | $ 108,000 |  |  |  |  |  |  |  |  |
Disposal of property and equipment | $ 160,000 |  |  |  |  |  |  |  |  |
Gain on disposal of equipment |  |  |  |  |  | 53,000 |  |  |  |
Finance Leased Assets |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Finance lease, amortization |  |  | $ 18,000 | $ 35,000 | $ 124,000 | $ 35,000 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Useful lives |  |  |  |  | 3 years |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Useful lives |  |  |  |  | 9 years |  |  |  |  |

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