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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Detail) | 12 Months Ended
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Sep. 30, 2017 USD ($) patent segment institution | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Accounting Policies [Abstract] |  |  |
Number of financial institutions signed agreements to deploy mobile deposit | institution | 5,900 |  |
Number of top U.S. retail banks that deployed mobile deposit | institution | 50 |  |
Number of patents granted | patent | 35 |  |
Number of patent applications pending | patent | 16 |  |
Currency translation adjustment | $ 208,000 | $ (46,000) | $ 0
Number of operating segments | segment | 1 |  |
Number of reporting units | segment | 1 |  |
Impairment of goodwill and intangibles | $ 0 |  |
Other-than-temporary impairment charges recognized | 0 | 0 | 0
Allowance for doubtful accounts | 0 | 0 | 0
Allowance for doubtful accounts receivable | $ 31,000 | 35,000 |
Deferred software maintenance fees amortization period | 1 year |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Depreciation | $ 322,000 | 790,000 | 433,000
Total repairs and maintenance expenses | 200,000 | 200,000 | 100,000
Impairment charges | 0 | 0 | 0
Software development costs capitalized | 0 | 0 |
Amortization expense from capitalized software costs or purchased technology | 0 | 0 | 0
Software development costs capitalized for internal use software | $ 0 | 0 | 0
Tax benefit is measured based on the largest benefit | Greater than 50% |  |
Advertising costs | $ 300,000 | 200,000 | $ 200,000
Accumulated other comprehensive loss | $ (147,000) | $ 42,000 |
Minimum |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment, estimated useful lives | 3 years |  |
Maximum |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment, estimated useful lives | 5 years |  |

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