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REVENUE RECOGNITION - Contract Balances (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]    
Accounts receivable, net $ 37,384 $ 20,181
Contract assets - current 10,507  
Contract assets - non-current 8,413  
Deferred revenue - current 7,216 $ 3,336
Deferred revenue - non-current $ 1,411