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4. BALANCE SHEET DETAIL - Additional information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2025
Restructuring Cost and Reserve [Line Items]            
Cost reduction 16.00%          
Severance related charges   $ 0 $ 357,000 $ 0 $ 357,000  
Accrued severance   $ 0   $ 0   $ 0
Cost of revenues            
Restructuring Cost and Reserve [Line Items]            
Severance related charges     204,000   204,000  
Research and development            
Restructuring Cost and Reserve [Line Items]            
Severance related charges     128,000   128,000  
Selling, general and administrative expense            
Restructuring Cost and Reserve [Line Items]            
Severance related charges     $ 24,000   $ 24,000