5. Equity Compensation Plans (Details Narrative) $ in Thousands	3 Months Ended
Jul. 31, 2019 USD ($) shares
Employee Stock Purchase Plan [Member]
Stock issued during period, ESPP	0
Stock Option [Member]
Unrecognized compensation costs related to non-vested stock options \| $	$ 4,900
Unrecognized compensation cost weighted average vesting period	3 years 11 days
RSUs [Member]
Unrecognized compensation cost weighted average vesting period	3 years 6 months 18 days
RSU's granted during period	194,000
Unrecognized compensation cost related to non-vested RSUs \| $	$ 1,800
Stock Incentive Plans [Member]
Stock reserved for issuance	7,161,429
Stock Incentive Plans [Member] \| Options and RSU's [Member]
Stock reserved for issuance	3,908,148
Stock Incentive Plans [Member] \| Future Grants [Member]
Stock reserved for issuance	3,253,281
Employee Stock Purchase Plan [Member]
Stock reserved for issuance	1,196,261

Aggregate number of common shares reserved for future issuance.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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