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Organization and Significant Accounting Policies - Contract Estimates (Details)	12 Months Ended
	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

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X

- Definition

Refers to aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods.

+ References

No definition available.

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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

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