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
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