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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) Patents Institution | Sep. 30, 2016 USD ($) Patents Institution Reporting Segment | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of patents granted | Patents | 27 | 27 |  |
Number of patent applications pending | Patents | 16 | 16 |  |
Number of financial institutions signed agreements to deploy mobile deposit | Institution | 5,400 | 5,400 |  |
Number of top U.S. retail banks that deployed mobile deposit | Institution | 50 | 50 |  |
Foreign currency translation adjustment |  | $ 46,000 | $ 0 | $ 0
Impairment of goodwill and intangibles | $ 0 |  |  |
Number of reporting unit | Reporting |  | 1 |  |
Other-than-temporary impairment charges recognized |  | $ 0 | 0 | 0
Allowance for doubtful accounts |  | 0 | 0 |
Allowance for doubtful accounts receivable | 35,000 | $ 35,000 | 13,000 |
Deferred software maintenance fees amortization period |  | 1 year |  |
Depreciation and amortization of property and equipment total |  | $ 800,000 | 400,000 | 500,000
Fixed assets acquired under capital leases | 2,743,000 | 2,743,000 | 2,505,000 |
Total repairs and maintenance expenses |  | 200,000 | 100,000 | 100,000
Impairment charges |  | 0 | 0 | 0
Software development costs capitalized | 0 | $ 0 | 0 |
Tax benefit is measured based on the largest benefit |  | Greater than 50% |  |
Advertising costs |  | $ 200,000 | 200,000 | 100,000
Number of operating segment | Segment |  | 1 |  |
Accumulated other comprehensive loss | 42,000 | $ 42,000 | 3,000 |
ASU No 2015-17 [Member] | Early adoption [Member] |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
New accounting guidance, no adjustment made to prior periods |  | true |  |
Minimum [Member] |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property and equipment, estimated useful lives |  | 3 years |  |
Maximum [Member] |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property and equipment, estimated useful lives |  | 5 years |  |
Assets acquired under capital leases [Member] |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Fixed assets acquired under capital leases | 100,000 | $ 100,000 | 100,000 |
Equipment [Member] |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Fixed assets acquired under capital leases | 1,476,000 | 1,476,000 | 1,281,000 |
Depreciation expense under capital lease |  | 19,000 | 19,000 | $ 19,000
Accumulated depreciation | $ 100,000 | $ 100,000 | $ 100,000 |

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