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v3.20.1

Related Party Transactions (Details) | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2020 USD ($) | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($) | Dec. 04, 2019 JPY (¥) | Dec. 04, 2019 USD ($) | May 11, 2019 | May 10, 2019 JPY (¥) | May 10, 2019 USD ($) | Feb. 09, 2019 | Feb. 08, 2019 | Jan. 29, 2019 JPY (¥) | Jan. 29, 2019 USD ($) | Apr. 17, 2018 JPY (¥) | Apr. 17, 2018 USD ($) | Dec. 27, 2017 JPY (¥) | Dec. 27, 2017 USD ($)
Long-Term Incentive Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 60,864,000 | $ 55,407,000 | $ 29,594,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unbilled related party receivables | 15,779,000 | 9,028,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Design and Development Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Incentive Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum net value | 166,108,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | 60,864,000 | 55,407,000 | 29,594,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Board member | Consulting agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Incentive Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid to related party | $ 59,000 | 55,000 | $ 48,000 |  |  |  |  |  |  |  |  |  |  |  |  |
HAPSMobile |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Incentive Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for purchase of interest |  |  |  | ¥ 540,050,000 | $ 4,982,000 |  | ¥ 500,000,000 | $ 4,569,000 |  |  | ¥ 209,500,000 | $ 1,926,000 | ¥ 150,000,000 | $ 1,407,000 | ¥ 210,000,000 | $ 1,860,000
Ownership percentage | 7.00% |  |  | 7.00% | 7.00% | 5.00% | 10.00% | 10.00% | 10.00% | 5.00% |  |  |  |  | 5.00% | 5.00%
Unbilled receivables and retention | HAPSMobile |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Incentive Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unbilled related party receivables | $ 15,779,000 | $ 9,028,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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