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Accounts Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Receivables [Abstract]    
Billed $ 9,367 $ 13,220
Unbilled 7,784 4,763
Allowance for doubtful accounts (597) (464)
Accounts receivable, net $ 16,554 $ 17,519