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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Apr. 30, 2021

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents

The following table summarizes cash and cash equivalents for the years ended April 30, 2021 and 2020:

		April 30, 2021				April 30, 2020
		(in thousands)
Checking and savings accounts		$	1,850			$	1,551
Money market account			81,178				8,451
		$	83,028			$	10,002

Schedule of Cash and Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Statement of Financial Position that sum to the total of the same such amounts shown in the Statement of Cash Flows for the years ended April 30, 2021 and 2020:

		April 30, 2021				April 30, 2020
		(in thousands)
Cash and cash equivalents		$	83,028			$	10,002
Restricted cash- short term			384				707
Restricted cash- long term			222				221
		$	83,634			$	10,930

Schedule of Property, Plant and Equipment, Useful Life

Description		Estimated useful life
Equipment		5 - 7 years
Computer equipment & software		3 years
Office furniture & fixtures		3 - 7 years
Equipment under capitalized lease		Over the life of the lease
Leasehold improvements		Shorter of the estimated useful life or lease term

Schedule of Revenue by Major Customers by Reporting Segments

The table below shows the percentage of the Company’s revenues derived from customers whose revenues accounted for at least 10% of the Company’s consolidated revenues for at least one of the periods indicated:

		Twelve months ended April 30,
Customer		2021				2020
Eni S.p.A.			22	%			10	%
EGP			61	%			72	%
Other (no customer over 10%)			17	%			18	%
			100	%			100	%

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table summarizes share-based compensation related to the Company’s share-based plans by expense category for the years ended April 30, 2021 and 2020:

		Twelve months ended April 30,
		2021				2020
		(in thousands)
Engineering and product development		$	376			$	89
Selling, general and administrative			405				251
Total share-based compensation expense		$	781			$	340

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