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Organization and Significant Accounting Policies - Contract Estimates (Details) | 12 Months Ended
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Apr. 30, 2021 USD ($) | Apr. 30, 2020 USD ($) | Apr. 30, 2019 USD ($) contract
Material adjustment to any one contract |  |  | $ 0
Amount of revised aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods | $ 1,041,000 |  |
Number of active contracts | contract |  |  | 1
TMS contract |  |  |
Amount of aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods | (1,041,000) |  |
Revision of estimate of total costs required to complete the contracts | Cumulative catch-up adjustment | Design and development agreement |  |  |
Amount of aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods |  | $ 1,099,000 |
Revision of estimate of total costs required to complete the contracts | Cumulative catch-up adjustment | TMS contract |  |  |
Amount of aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods | $ (1,403,000) | $ (1,099,000) |

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- Definition Amount of revised aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods + References No definition available. + Details
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