Summary of Significant Accounting Policies (Tables)

3 Months Ended

Jul. 31, 2026

Accounting Policies [Abstract]

Schedule of Cash, 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.

		July 31, 2026				April 30, 2026
		(in thousands)
Cash and cash equivalents		$	7,356			$	8,719
Restricted cash, short-term			154				154
Cash, cash equivalents, restricted cash and restricted cash		$	7,510			$	8,873

Schedule of Property and Equipment Estimated Useful Life

Description		Estimated depreciable life

Equipment		5-7 years
Computer equipment & software		3 years
Office furniture & fixtures		3-7 years
Leasehold improvements		Shorter of the estimated useful life or lease term
Leased Power Buoy and mooring assets		7 years
Leased WAM-V assets		7 years

Schedule of Revenue Recognized Under ASC 606 and ASC 842

The table below represents the total revenue recognized under ASC 606 and ASC 842 for the three months ended July 31, 2026 and 2025.

		ASC 606				ASC 842				Total				ASC 606				ASC 842				Total
		Three months ended July 31, 2026												Three months ended July 31, 2025
		ASC 606				ASC 842				Total				ASC 606				ASC 842				Total
		(in thousands)												(in thousands)
Product Line:
WAM-V		$	321			$	68			$	389			$	1,038			$	67			$	1,105
Buoy			27				589				616				66				—				66
Services			698				—				698				11				—				11
Total		$	1,046			$	657			$	1,703			$	1,115			$	67			$	1,182

Region:
North and South America		$	768			$	589			$	1,357			$	134			$	—			$	134
EMEA			21				68				89				980				67				1,047
Asia and Australia			257				—				257				1				—				1
Total		$	1,046			$	657			$	1,703			$	1,115			$	67			$	1,182
Revenues		$	1,046			$	657			$	1,703			$	1,115			$	67			$	1,182