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Debt (Summary of debt and interest payment obligations) (Detail) (USD $)
Sep. 30, 2012
Schedule Of Maturities Of Long Term Debt [Line Items]  
Debt payment obligations,2013 remainder $ 3,750,000
Interest payments on debt payment obligations, 2013 remainder 914,000
Total, 2013 remainder 4,664,000
Debt payment obligations, 2014 5,000,000
Interest payments on debt payment obligations, 2014 1,110,000
Total, 2014 6,110,000
Debt payment obligations, 2015 6,875,000
Interest payments on debt payment obligations, 2015 973,000
Total, 2015 7,848,000
Debt payment obligations, 2016 9,375,000
Interest payments on debt payment obligations, 2016 777,000
Total, 2016 10,152,000
Debt payment obligations, 2017 10,000,000
Interest payments on debt payment obligations, 2017 531,000
Total, 2017 10,531,000
Debt payment obligations, Thereafter 15,000,000
Interest payments on debt payment obligations, Thereafter 172,000
Total, Thereafter 15,172,000
Debt payment obligations 50,000,000
Interest payments on debt payment obligations 4,477,000
Total $ 54,477,000