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Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred tax valuation allowance, percentage | 100.00%mitk_DeferredTaxValuationAllowanceNetOfAssetsPercentage |  | 100.00%mitk_DeferredTaxValuationAllowanceNetOfAssetsPercentage |
Accrued interest | $ 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | $ 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | $ 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | $ 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Recognized income tax interest and/or penalties | $ 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | $ 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | $ 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | $ 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
Federal [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards will begin to expire |  |  | Sep. 30, 2018 |
State [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards will begin to expire |  |  | Sep. 30, 2015 |

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- Definition Deferred tax valuation allowance, net of assets percentage. + References No definition available. + Details
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X
- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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