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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) institution | Mar. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) segment institution | Mar. 31, 2017 USD ($) | Dec. 31, 2017 patent institution | Oct. 01, 2017 USD ($) | Sep. 30, 2017 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |  |
Number of financial institutions signed agreements to deploy mobile deposit (more than) (in institutions) | institution | 6,100 |  | 6,100 |  |  |  |
Number of top retail banks that deployed mobile deposit | institution |  |  |  |  | 50 |  |
Number of patents granted | patent |  |  |  |  | 39 |  |
Number of pending patent applications | patent |  |  |  |  | 16 |  |
Foreign currency translation adjustment | $ 403,000 | $ 74,000 | $ 592,000 | $ (296,000) |  |  |
Other-than-temporary impairment charges recognized | 0 | $ 0 | 0 | 0 |  |  |
Allowance for doubtful accounts receivable | 140,000 |  | 140,000 |  |  |  | $ 31,000
Software development costs capitalized | 0 |  | 0 |  |  |  | 0
Capitalized software development costs for internal use software during period |  |  | $ 300,000 | $ 0 |  |  |
Number of operating segments | segment |  |  | 1 |  |  |  |
Number of reporting units | segment |  |  | 1 |  |  |  |
Accumulated other comprehensive loss | $ (668,000) |  | $ (668,000) |  |  |  | $ (147,000)
Retained Earnings | ASU 2016-09 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | $ 8,300,000 |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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