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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

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