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4. BALANCE SHEET DETAIL - Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Inventories:    
Work-in-progress $ 1,853 $ 1,983
Finished goods 3,604 3,690
Inventory at distributors 6 12
Total inventory $ 5,463 $ 5,685