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Property and Equipment - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 61 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2019 | Jul. 31, 2018 | Jan. 31, 2020 | Oct. 31, 2019 | Apr. 30, 2020 | Apr. 30, 2019 | Nov. 30, 2019
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  | $ 825,000 | $ 606,000 |
Finance lease, depreciation and amortization expenses |  |  |  |  | 683,000 | 490,000 |
Capitalized computer software costs |  |  |  |  | 300,000 |  |
Assets under finance lease |  |  |  |  | 343,000 | 366,000 |
Finance lease costs | $ 231,000 | $ 266,000 |  |  |  |  | $ 149,000
Future minimum lease payments remaining | 135,000 |  | $ 2,000 |  |  |  |
Finance leases monthly payments | $ 19,000 | $ 11,000 |  |  |  |  |
Property, plant and equipment, net |  |  |  |  | 3,993,000 | 2,546,000 |
Gain on disposal of equipment |  |  |  |  | 52,000 | 0 |
Present value of minimum future obligations interest rate | 4.75% |  |  |  |  |  |
Finance lease, depreciation and amortization expense |  |  |  |  | 88,500 |  |
Finance Leased Assets |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Depreciation |  |  |  |  | 142,000 | $ 116,000 |
Laboratory Equipment |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Finance leased assets traded in |  |  |  | $ 235,000 |  |  |
Accumulated depreciation written off |  |  |  | 127,000 |  |  |
Traded-in Assets |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Reduction in the purchase price |  |  |  | $ 160,000 |  |  |
Property, plant and equipment, net |  |  |  |  | 108,000 |  |
Gain on disposal of equipment |  |  |  |  | $ 52,000 |  |

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