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v3.20.1

Organization and Significant Accounting Policies - Contract Estimates (Details) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2020 USD ($) contract | Apr. 30, 2018 USD ($)
Material adjustment to any one contract | $ 0 |
Number of active contracts | contract | 1 |
Revision of estimate of total costs required to complete the contracts | Cumulative catch-up adjustment |  |
Amount of revised aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods |  | $ 1,255,000
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) |

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