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Accounts Receivable - Schedule of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Mar. 31, 2015
Receivables [Abstract]    
Accounts receivable (billed) $ 15,801 $ 8,946
Accounts receivable (unbilled) 1,305 987
Less: Allowance for doubtful accounts (54) (54)
Accounts receivable, net $ 17,052 $ 9,879