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Stockholders' Equity - Number of Stock Options Outstanding under Prior Plans (Detail)	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	1,490,583
2000 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	206,262
2002 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	191,000
2006 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	43,000
2010 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	1,050,321

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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