Fair Value Measurement & Derivative Investments - Change in Fair Value of Contingent Consideration Obligation (Detail) (USD $)	Sep. 30, 2012
Business Acquisition, Contingent Consideration [Line Items]
Value at September 30, 2011	$ 173,621
Purchase price contingent consideration	173,621
Contingent consideration payments
Change in fair value of contingent consideration
Value at September 30, 2012	$ 173,621

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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+ Details