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Leases - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Jul. 31, 2020
Oct. 31, 2022
Oct. 31, 2021
Apr. 30, 2022
Apr. 01, 2021
Jun. 01, 2020
Mar. 30, 2020
Lessee, Lease, Description [Line Items]                  
Operating leases, rent expense $ 466 $ 467   $ 934 $ 932        
Extension term                 6 months
Operating lease right-of-use assets, net 7,698     7,698   $ 8,230      
Present value of minimum lease payments $ 8,965     $ 8,965          
Weighted average remaining lease term (in years) 6 years 2 months 4 days     6 years 2 months 4 days          
Weighted average discount rate, percent 5.73%     5.73%          
Corporate Headquarters                  
Lessee, Lease, Description [Line Items]                  
Operating leases, rent expense $ 21 24   $ 42 47        
Rockville, MD                  
Lessee, Lease, Description [Line Items]                  
Operating leases, rent expense 422 422   844 850        
Operating lease right-of-use assets, net     $ 118         $ 3,800  
Present value of minimum lease payments     125         $ 3,800  
Incremental rent expense     $ 8            
Additional Expansion Premises                  
Lessee, Lease, Description [Line Items]                  
Operating lease right-of-use assets, net             $ 3,300    
Present value of minimum lease payments             $ 3,300    
Milan Italy                  
Lessee, Lease, Description [Line Items]                  
Operating leases, rent expense 23 $ 21   48 $ 34        
Operating lease right-of-use assets, net 205     205          
Present value of minimum lease payments $ 205     $ 205