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4. BALANCE SHEET DETAIL - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Mar. 31, 2020
Inventories:    
Work-in-progress $ 1,924 $ 1,650
Finished goods 2,572 2,612
Inventory at distributors 27 20
Total inventory $ 4,523 $ 4,282