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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Jul. 31, 2025
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, 2025   April 30, 2025 
   (in thousands) 
Cash and cash equivalents  $9,860   $6,715 
Restricted cash- long term   154    154 
Cash, cash equivalents, restricted cash and restricted cash equivalents  $10,014   $6,869 
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 assets   10 years
Leased WAM-V assets   10 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, 2025 and 2024.

 

                         
   Three months ended July 31, 2025   Three months ended July 31, 2024 
   ASC 606   ASC 842   Total   ASC 606   ASC 842   Total 
   (in thousands)   (in thousands) 
Product Line:                              
WAM-V  $1,038   $67   $1,105   $822   $67   $889 
Buoy   66    —    66    —    —    — 
Services   11    —    11    

412

    —    

412

 
Total  $1,115   $67   $1,182   $1,234   $67   $1,301 
                               
Region:                              
North and South America  $134   $—   $134   $1,230   $—   $1,230 
EMEA   980    67    1,047    4    67    67 
Asia and Australia   1    —    1    —    —    — 
Total  $1,115   $67   $1,182   $1,234   $67   $1,301