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Stockholders' Equity - Number of Stock Options Outstanding under Prior Plans (Detail)	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	1,610,567
2000 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	215,412
2002 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	226,100
2006 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	49,000
2010 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	1,120,055

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- Definition

Share based compensation arrangement by share based payment award options outstanding under prior plans number.

+ References

No definition available.

+ Details

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Namespace Prefix:	mitk_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration