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4. BALANCE SHEET DETAIL - Accounts receivable, net (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Accounts receivable, net:    
Accounts receivable $ 7,468 $ 7,441
Less: Allowances for doubtful accounts and other (93) (102)
Total accounts receivable, net $ 7,375 $ 7,339