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Leases - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Apr. 30, 2021
Leases [Abstract]          
Right of use assets $ 8,454   $ 8,454   $ 9,279
Operating cash paid to settle lease liabilities     $ 1,006 $ 848  
Remaining lease term (in years)     8 years    
Option to extend, term (in years)     5 years    
Option to terminate, term (in years)     1 year    
Operating lease, expense 707 $ 683 $ 1,555 1,315  
Operating lease, short term, expense $ 201 $ 245 $ 549 $ 467  
Weighted average remaining lease term, operating lease (in years) 5 years 8 months 12 days   5 years 8 months 12 days    
Weighted average discount rate, operating lease 4.10%   4.10%    
Weighted average remaining lease term, finance lease (in years) 3 years 9 months 18 days   3 years 9 months 18 days    
Weighted average discount rate, finance lease 10.00%   10.00%    
Operating lease, lease not yet commenced, future minimum lease payments $ 219   $ 219    
Operating lease, lease not yet commenced, term (in years) 5 years   5 years