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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Oct. 31, 2024
Accounting Policies [Abstract]  
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.

  

   October 31, 2024   April 30, 2024 
   (in thousands) 
Cash and cash equivalents  $2,092   $3,151 
Restricted cash- long term   154    154 
Cash, cash equivalents, restricted cash and restricted cash equivalents  $2,246   $3,305 
Schedule of Property, Plant and Equipment, 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 Recognizes from Operating Lease Arrangements

The table below represents the total revenue recognized under ASC 606 and ASC 842 for the three and six months ended July 31, 2024 and 2023.

  

   ASC 606   ASC 842   Total   ASC 606   ASC 842   Total 
   Six months ended October 31, 2024   Six months ended October 31, 2023 
   ASC 606   ASC 842   Total   ASC 606   ASC 842   Total 
   (in thousands)   (in thousands) 
Product Line:                              
WAM-V  $3,416   $132   $3,548   $540   $509   $1,049 
Buoy   171    —    171    630    —    630 
Services   —    —    —    482    —    482 
Total  $3,587   $132   $3,719   $1,652   $509   $2,161 
                               
Region:                              
North and South America  $2,720   $—   $2,720   $1,634   $412   $2,046 
Europe   865    132    997    18    97    115 
Asia and Australia   2    —    2    —    —    — 
Total  $3,587   $132   $3,719   $1,652   $509   $2,161 

 

   ASC 606   ASC 842   Total   ASC 606   ASC 842   Total 
   Three months ended October 31, 2024   Three months ended October 31, 2023 
   ASC 606   ASC 842   Total   ASC 606   ASC 842   Total 
   (in thousands)   (in thousands) 
Product Line:                              
WAM-V  $2,182   $65   $2,247   $81   $266   $347 
Buoy   171    —    171    380    —    380 
Services   —    —    —    162    —    162 
Total  $2,353   $65   $2,418   $623   $266   $889 
                               
Region:                              
North and South America  $1,491   $—   $1,491   $605   $187   $792 
EMEA   860    65    925    18    79    97 
Asia and Australia   2    —    2    —    —    — 
Total  $2,353   $65   $2,418   $623   $266   $889