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Accounts Receivable - Schedule of Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Receivables [Abstract]    
Accounts receivable (billed) $ 9,225 $ 17,222
Accounts receivable (unbilled) 1,863 1,642
Less: Allowance for doubtful accounts      
Accounts receivable, net $ 11,088 $ 18,864