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Property and Equipment - Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended 61 Months Ended
Dec. 31, 2019
USD ($)
Jul. 31, 2018
USD ($)
Oct. 31, 2020
USD ($)
Jan. 31, 2020
USD ($)
Oct. 31, 2019
USD ($)
asset
Apr. 30, 2021
USD ($)
Apr. 30, 2020
USD ($)
Nov. 30, 2019
USD ($)
Property, Plant and Equipment [Line Items]                
Depreciation and amortization           $ 1,200,000 $ 825,000  
Finance lease, depreciation and amortization expenses           925,000 683,000  
Assets under finance lease           343,000 343,000  
Property, plant and equipment, gross           10,046,000 6,765,000  
Hosting arrangement, amortization expense           134,000    
Hosting arrangement, capitalized enhancements           991,000    
Finance lease costs $ 231,000 $ 266,000           $ 149,000
Future minimum lease payments remaining       $ 2,000   174,000 35,000  
Finance leases monthly payments $ 19,000 $ 11,000            
Number of assets acquired | asset         2      
Gain on disposal of equipment           0 52,000  
Finance lease, payment, due           0 135,000  
Present value of minimum future obligations interest rate 4.75%              
Finance lease, depreciation and amortization expense           124,000 88,500  
Property, plant and equipment, net           6,090,000 3,993,000  
Finance Leased Assets                
Property, Plant and Equipment [Line Items]                
Depreciation           124,000 142,000  
Laboratory equipment                
Property, Plant and Equipment [Line Items]                
Finance leased assets traded in         $ 235,000      
Accumulated depreciation written off     $ 127,000          
Property, plant and equipment, gross           $ 6,640,000 4,818,000  
Capitalized software development costs                
Property, Plant and Equipment [Line Items]                
Useful life           3 years    
Property, plant and equipment, gross           $ 484,000 0  
Assets in progress                
Property, Plant and Equipment [Line Items]                
Hosting arrangement, service contract, implementation cost           315,000    
Property, plant and equipment, gross           1,211,000 $ 554,000  
Traded-in Assets                
Property, Plant and Equipment [Line Items]                
Reduction in the purchase price         $ 160,000      
Gain on disposal of equipment           52,000    
Property, plant and equipment, net           $ 108,000