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4. BALANCE SHEET DETAIL - Accounts receivable, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Accounts receivable, net:    
Accounts receivable $ 5,468 $ 7,441
Less: Allowances for doubtful accounts and other (70) (102)
Total accounts receivable, net $ 5,398 $ 7,339