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4. BALANCE SHEET DETAIL - Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Mar. 31, 2023
Prepaid expenses and other current assets:    
Prepaid tooling and masks $ 210 $ 333
Other receivables 168 156
Other prepaid expenses and other current assets 880 925
Total prepaid expenses and other current assets $ 1,258 $ 1,414