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Accounts Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Receivables [Abstract]    
Billed $ 9,172 $ 6,582
Unbilled 8,390 4,309
Allowance for doubtful accounts (512) (228)
Accounts receivable, net $ 17,050 $ 10,663