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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) patent institution $ / shares | Sep. 30, 2018 USD ($) segment patent institution $ / shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 USD ($) | Oct. 01, 2018 USD ($) | Oct. 01, 2017 USD ($)
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of financial institutions signed agreements to deploy mobile deposit | institution | 6,100 | 6,100 |  |  |  |
Number of patents granted | patent | 49 | 49 |  |  |  |
Number of patent applications pending | patent | 21 | 21 |  |  |  |
Foreign currency translation adjustment |  | $ (723,000) | $ 208,000 | $ (46,000) |  |
Other-than-temporary impairment charges recognized |  | 0 | 0 | 0 |  |
Write-offs of allowance for doubtful accounts |  | 0 | 0 | 0 |  |
Allowance for doubtful accounts receivable | $ 262,000 | $ 262,000 | 31,000 |  |  |
Deferred software maintenance fees amortization period |  | 1 year |  |  |  |
Depreciation and other amortization |  | $ 615,000 | 322,000 | 790,000 |  |
Total repairs and maintenance expenses |  | 100,000 | 200,000 | 200,000 |  |
Impairment charges |  | 0 | 0 | 0 |  |
Software development costs capitalized | 0 | 0 | 0 |  |  |
Amortization expense from capitalized software costs or purchased technology |  | 0 | 0 | 0 |  |
Capitalized software development costs for internal use | 900,000 | 900,000 | 0 |  |  |
Amortization expense for capitalized software development costs for internal use |  | $ 100,000 | $ 0 | 0 |  |
Number of operating segments | segment |  | 1 |  |  |  |
Number of reporting units | segment |  | 1 |  |  |  |
Goodwill impairment | $ 0 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 | $ 0.001 |  |  |
Impairment charges related to intangible assets |  | $ 0 | $ 0 | 0 |  |
Advertising costs |  | 500,000 | 300,000 | $ 200,000 |  |
Accumulated other comprehensive income (loss) | $ (586,000) | $ (586,000) | 147,000 |  |  |
ASU 2016-09 |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cumulative effect adjustment of new accounting pronouncement in the period of adoption |  |  | 8,255,000 |  |  |
ASU 2016-09 | Retained Earnings |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cumulative effect adjustment of new accounting pronouncement in the period of adoption |  |  | $ 8,255,000 |  |  | $ 8,300,000
ICAR | Spanish Government Agencies |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Interest rate of loan agreements | 0.00% | 0.00% |  |  |  |
Total amounts outstanding under loan agreements | $ 800,000 | $ 800,000 |  |  |  |
ICAR | Spanish Government Agencies | Other Current Liabilities |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Current amount outstanding under loan agreements | 300,000 | 300,000 |  |  |  |
ICAR | Spanish Government Agencies | Other Noncurrent Liabilities |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Non-current amount outstanding under loan agreements | $ 500,000 | $ 500,000 |  |  |  |
Performance Shares |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Trading-day average stock price period |  | 20 days |  |  |  |
Minimum |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, estimated useful lives |  | 3 years |  |  |  |
Minimum | ASC Topic 606 | Scenario, Forecast | Retained Earnings |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cumulative effect adjustment of new accounting pronouncement in the period of adoption |  |  |  |  | $ 1,200,000 |
Cumulative-effect adjustment of new accounting pronouncement, net of income tax |  |  |  |  | 800,000 |
Minimum | ICAR | Spanish Government Agencies |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Repayment period of loan agreements |  | 5 years |  |  |  |
Maximum |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, estimated useful lives |  | 10 years |  |  |  |
Maximum | ASC Topic 606 | Scenario, Forecast | Retained Earnings |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cumulative effect adjustment of new accounting pronouncement in the period of adoption |  |  |  |  | 2,000,000.0 |
Cumulative-effect adjustment of new accounting pronouncement, net of income tax |  |  |  |  | $ 1,400,000 |
Maximum | ICAR | Spanish Government Agencies |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Repayment period of loan agreements |  | 12 years |  |  |  |

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