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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2015 USD ($) Institution Segment | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Nov. 30, 2015 Patents
Property Plant And Equipment [Line Items] |  |  |  |
Number of financial institutions signed agreements to deploy mobile deposit | Institution | 4,495 |  |  |
Number of top U.S. retail banks that deployed mobile deposit | Institution | 50 |  |  |
Foreign currency translation adjustment | $ 318 | $ 0 |  |
Number of reporting unit | Segment | 1 |  |  |
Goodwill impairment | $ 0 |  |  |
Other-than-temporary impairment charges recognized | 0 | 0 | $ 0 |
Allowance for doubtful accounts | 0 | 0 |  |
Allowance for doubtful accounts receivable | $ 12,900 | 6,100 |  |
Deferred software maintenance fees amortization period | 1 year |  |  |
Depreciation and amortization of property and equipment total | $ 433,296 | 470,697 | 323,383 |
Fixed assets acquired under capital leases | 2,504,935 | 2,385,390 |  |
Total repairs and maintenance expenses | 127,143 | 115,792 | 97,532 |
Impairment charges | 0 | 0 | 0 |
Software development costs capitalized | $ 0 | 0 |  |
Tax benefit is measured based on the largest benefit | Greater than 50% |  |  |
Advertising costs | $ 201,882 | 99,670 | 123,905 |
Number of Operating Segments | Segment | 1 |  |  |
Accumulated other comprehensive (loss) income | $ (3,241) | (7,810) |  |
Minimum [Member] |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Property and equipment, estimated useful lives | 3 years |  |  |
Maximum [Member] |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Property and equipment, estimated useful lives | 5 years |  |  |
Assets acquired under capital leases [Member] |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Fixed assets acquired under capital leases | $ 95,388 | 95,388 |  |
Equipment [Member] |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Fixed assets acquired under capital leases | 1,281,161 | 1,177,364 |  |
Depreciation expense under capital lease | 19,078 | 19,078 | $ 19,078 |
Accumulated depreciation | $ 74,722 | $ 55,644 |  |
Subsequent Event |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |
Number of patents granted | Patents |  |  |  | 22
Number of patent applications pending | Patents |  |  |  | 21

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