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4. BALANCE SHEET DETAIL - Accounts receivable, net (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Accounts receivable, net:    
Accounts receivable $ 7,441 $ 5,342
Less: Allowances for doubtful accounts and other (102) (63)
Total accounts receivable, net $ 7,339 $ 5,279