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Accounts Receivable - Schedule of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Receivables [Abstract]    
Accounts receivable (billed) $ 5,072 $ 4,403
Accounts receivable (unbilled) 2,550 3,016
Less: Allowance for doubtful accounts 0 (54)
Accounts receivable, net $ 7,622 $ 7,365