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Related Party Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Dec. 04, 2019
May 11, 2019
May 10, 2019
Feb. 09, 2019
Feb. 08, 2019
Dec. 27, 2017
Long-Term Incentive Awards                  
Revenue $ 42,426 $ 60,864 $ 55,407            
Unbilled related party receivables 544 15,779              
Design and Development Agreement                  
Long-Term Incentive Awards                  
Maximum net value 180,806                
Revenue 42,426 60,864 55,407            
Board member | Consulting agreement                  
Long-Term Incentive Awards                  
Amount paid to related party $ 29 59 $ 55            
HAPSMobile                  
Long-Term Incentive Awards                  
Ownership percentage 7.00%     7.00% 5.00% 10.00% 10.00% 5.00% 5.00%
Unbilled receivables and retention | HAPSMobile                  
Long-Term Incentive Awards                  
Unbilled related party receivables $ 544 $ 15,779