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Accounts Receivable - Schedule of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Receivables [Abstract]    
Accounts receivable (billed) $ 7,620 $ 7,436
Accounts receivable (unbilled) 627 574
Less: Allowance for doubtful accounts (54) (54)
Accounts receivable, net $ 8,193 $ 7,956