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Fair Value of Financial Assets and Liabilities - Rollforward of Aggregate Fair Values of Warrants (Detail) (Warrant [Member], USD $)
In Thousands, unless otherwise specified
9 Months Ended
Jun. 30, 2013
Warrant [Member]
 
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning Balance $ 2,001
Warrants expired (20)
Decrease in fair value (214)
Increase in fair value 17
Ending Balance $ 1,784