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4. BALANCE SHEET DETAIL - Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Mar. 31, 2021
Prepaid expenses and other current assets:    
Prepaid tooling and masks $ 235 $ 584
Other receivables 257 291
Other prepaid expenses and other current assets 1,859 612
Total prepaid expenses and other current assets $ 2,351 $ 1,487