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Fair Value Measurements - Change in Fair Value of Contingent Consideration Obligations (Detail) (USD $) | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
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Business Combinations [Abstract] |  |  |
Value, Beginning balance | $ 1,595,273 | $ 173,621 |
Purchase price contingent consideration |  | 173,621 |
Contingent consideration payments |  |  |
Change in fair value of contingent consideration | 1,421,652 |  |
Value, Ending balance | $ 1,595,273 | $ 173,621 |

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