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INVENTORIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Mar. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 15,428 $ 15,311
Work in process 46 819
Finished goods 5,600 5,376
Deferred costs 4,966 721
Total inventories $ 26,040 $ 22,227