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Accounts Receivable - Schedule of Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Mar. 31, 2013
Accounts Notes And Loans Receivable [Line Items]    
Accounts receivable (billed) $ 8,592 $ 17,222
Accounts receivable (unbilled) 713 1,642
Less: Allowance for doubtful accounts (16)  
Accounts receivable, net $ 9,289 $ 18,864