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4. BALANCE SHEET DETAIL - Accrued expenses and other liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Mar. 31, 2025
Accrued expenses and other liabilities:    
Accrued compensation $ 2,448 $ 2,488
Accrued commissions 133 85
Production mask set   1,250
Miscellaneous accrued expenses 587 618
Total accrued expenses and other liabilities $ 3,168 $ 4,441