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4. BALANCE SHEET DETAIL - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Mar. 31, 2021
Inventories:    
Work-in-progress $ 3,186 $ 1,561
Finished goods 1,535 2,764
Inventory at distributors 15 18
Total inventory $ 4,736 $ 4,343