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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Oct. 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.

 

   October 31, 2025   April 30, 2025 
   (in thousands) 
Cash and cash equivalents  $11,659   $6,715 
Restricted cash- long term   154    154 
Cash, cash equivalents, restricted cash and restricted cash equivalents  $11,813   $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 and six months ended October 31, 2025 and 2024.

 

                         
   Three months ended October 31, 2025   Three months ended October 31, 2024 
   ASC 606   ASC 842   Total   ASC 606   ASC 842   Total 
   (in thousands)   (in thousands) 
Product Line:                              
WAM-V  $101   $68   $169   $2,182   $65   $2,247 
Buoy   255    —    255    171    —    171 
Services   —    —    —    —    —    — 
Total  $356   $68   $424   $2,353   $65   $2,418 
                               
Region:                              
North and South America  $137   $—   $137   $1,491   $—   $1,491 
EMEA   43    68    111    860    65    925 
Asia and Australia   176    —    176    2    —    2 
Total  $356   $68   $424   $2,353   $65   $2,418 

 

 

                         
   Six months ended October 31, 2025   Six months ended October 31, 2024 
   ASC 606   ASC 842   Total   ASC 606   ASC 842   Total 
   (in thousands)   (in thousands) 
Product Line:                              
WAM-V  $1,139   $135   $1,274   $3,416   $132   $3,548 
Buoy   321    —    321    171    —    171 
Services   11    —    11    —    —    — 
Total  $1,471   $135   $1,606   $3,587   $132   $3,719 
                               
Region:                              
North and South America  $272   $—   $272   $2,720   $—   $2,720 
Europe   1,022    135    1,157    865    132    997 
Asia and Australia   177    —    177    2    —    2 
Total  $1,471   $135   $1,606   $3,587   $132   $3,719