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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 |  |  |  |  |  |  |

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