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Commitments and Contingencies (Future minimum annual payments under operating leases) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Commitments Contingencies And Guarantees [Line Items]  
2013 (remainder) $ 1,078
2014 1,384
2015 1,396
2016 1,428
2017 1,122
Thereafter   
Total $ 6,408