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Fair Value Measurements - Change in Fair Value of Contingent Consideration Obligations (Detail) (USD $) | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012
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Business Acquisition Contingent Consideration [Line Items] |  |  |  |
Value, Beginning balance | $ 1,595,273 | $ 1,595,273 | $ 173,621 | $ 173,621
Purchase price contingent consideration |  |  |  |
Contingent consideration payments |  |  |  |
Change in fair value of contingent consideration |  | 1,421,652 |  |
Value, Ending balance | $ 1,595,273 | $ 1,595,273 | $ 173,621 | $ 173,621

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