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Income Taxes - Additional Information (Detail)	6 Months Ended
	Mar. 31, 2017
Income Taxes [Line Items]
Deferred tax valuation allowance (as a percent)	100.00%
Federal
Income Taxes [Line Items]
Net operating loss carryforwards will begin to expire	Sep. 30, 2018
State
Income Taxes [Line Items]
Net operating loss carryforwards will begin to expire	Sep. 30, 2016

X

- Definition

Deferred tax valuation allowance, net of assets percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	mitk_
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Balance Type:	na
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X

- Definition

Income taxes.

+ References

No definition available.

+ Details

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X

- 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=65882285&loc=d3e32559-109319

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X

- Details

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Namespace Prefix:
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X

- Details

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