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4. BALANCE SHEET DETAIL - Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Mar. 31, 2020
Prepaid expenses and other current assets:    
Prepaid tooling and masks $ 783 $ 707
Prepaid income taxes 45 79
Other receivables 234 211
Other prepaid expenses and other current assets 917 937
Total prepaid expenses and other current assets $ 1,979 $ 1,934