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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Jan. 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.

 

   January 31, 2025   April 30, 2024 
   (in thousands) 
Cash and cash equivalents  $10,026   $3,151 
Restricted cash- long term   154    154 
Cash, cash equivalents, restricted cash and restricted cash equivalents  $10,180   $3,305 
Schedule of Property and Equipment Estimated Depreciable 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 nine months ended January 31, 2025 and 2024.

 

   ASC 606   ASC 842   Total   ASC 606   ASC 842   Total 
   Nine months ended January 31, 2025   Nine months ended January 31, 2024 
   ASC 606   ASC 842   Total   ASC 606   ASC 842   Total 
   (in thousands)   (in thousands) 
Product Line:                              
WAM-V  $3,996   $206   $4,202   $1,625   $896   $2,521 
Buoy   343    —    343    950    —    950 
Services   —    —    —    482    —    482 
Total  $4,339   $206   $4,545   $3,057   $896   $3,953 
                               
Region:                              
North and South America  $3,046   $—   $3,046   $3,025   $750   $3,775 
EMEA   1,291    206    1,497    32    146    178 
Asia and Australia   2    —    2    —    —    — 
Total  $4,339   $206   $4,545   $3,057   $896   $3,953 

 

   ASC 606   ASC 842   Total   ASC 606   ASC 842   Total 
   Three months ended January 31, 2025   Three months ended January 31, 2024 
   ASC 606   ASC 842   Total   ASC 606   ASC 842   Total 
   (in thousands)   (in thousands) 
Product Line:                              
WAM-V  $580   $74   $654   $1,085   $387   $1,472 
Buoy   171    —    171    320    —    320 
Services   —    —    —    —    —    — 
Total  $751   $74   $825   $1,405   $387   $1,792 
                               
Region:                              
North and South America  $326   $—   $326   $1,391   $338   $1,729 
EMEA   425    74    499    14    49    63 
Asia and Australia   —    —    —    —    —    — 
Total  $751   $74   $825   $1,405   $387   $1,792