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INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Reconciliation of Unrecognized Tax Benefits [Roll Forward]      
Balance at beginning of year $ 5,033 $ 3,980 $ 3,331
Gross increases - tax position in prior period 0 17 0
Gross increases - tax position related to the current year 1,082 1,036 649
Balance at end of year $ 6,115 $ 5,033 $ 3,980