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