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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Jan. 31, 2022

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents

 Schedule of Cash and Cash Equivalents

		January 31, 2022				April 30, 2021
		(in thousands)
Checking and savings accounts		$	1,519			$	1,850
Money market account			61,935				81,178
		$	63,454			$	83,028

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 Consolidated Balance Sheets that total to the same amounts shown in the Consolidated Statements of Cash Flows.

 Schedule of Cash and Cash Equivalents and Restricted Cash

		January 31, 2022				April 30, 2021
		(in thousands)
Cash and cash equivalents		$	63,454			$	83,028
Restricted cash- short term			384				384
Restricted cash- long term			222				222
Cash, cash equivalents and restricted cash		$	64,060			$	83,634

Schedule of Revenue by Major Customers by Reporting Segments

The table below shows the amount 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:

 Schedule of Revenue by Major Customers by Reporting Segments

		2022				2021				2022				2021
		Three months ended January 31,								Nine months ended January 31,
		2022				2021				2022				2021
		(in thousands)								(in thousands)
Eni S.p.A.		$	—			$	34			$	14			$	135
Department of Energy			102				—				182				—
EGP			—				223				163				379
ACET			—				33				—				37
Valaris (1)			7				—				142				—
Brigham Young University (2)			66				—				66				—
Nippon Kaiyo (2)			78				—				78				—
Naval Surface Warfare Center (2)			98				—				98				—
Other (no customer over 10%)			133				27				260				53
Revenues		$	484			$	317			$	1,003			$	604

(1)	3Dent related consulting
(2)	MAR related sales

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

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

		2022				2021				2022				2021
		Three months ended January 31,								Nine months ended January 31,
		2022				2021				2022				2021
		(in thousands)								(in thousands)
Engineering and product development		$	209			$	32			$	551			$	91
Selling, general and administrative			108				83				313				247
Total share-based compensation expense		$	317			$	115			$	864			$	338

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