Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	Dec. 31, 2014 Institution Patents	Sep. 30, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Number of patents granted	20mitk_NumberOfPatentsGranted
Number of patent applications pending	23mitk_NumberOfPendingPatentApplications
Number of financial institutions signed agreements to deploy Mobile Deposit	3,304
Number of companies deployed Mobile Deposit	2,744
Number of U.S. retail banks and payment processing companies	50
Software development costs capitalized	$ 0		$ 0
Accumulated other comprehensive gain (loss)	$ (9,997)	$ (7,810)

- 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.

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