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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Sep. 30, 2012
Property, Plant and Equipment [Line Items] |  |
Number of financial institutions | 1,059 |
Number of companies deployed Mobile Deposit | 559 |
Number of retail banks and payment processing companies | 33 |
Allowance for doubtful accounts | $ 16,000 | $ 17,773
Net unrealized loss | 3,561 |
Net unrealized losses |  | 616
Software and Software Development Costs [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Amortization of software development costs | $ 0 | $ 0

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