Income Taxes - Components of the Net Deferred Tax (Liability) and Asset (Detail) - USD ($)	Sep. 30, 2016	Sep. 30, 2015
Deferred tax assets:
Accrued compensation	$ 1,691,050	$ 1,513,021
Stock compensation	7,224,958	6,571,774
Capitalized research and development	2,957,528
Fair value adjustments		2,850,125
Net operating losses	125,120,957	88,965,968
Intangible Assets	5,544,091	5,551,705
Total deferred tax assets	142,538,584	105,452,593
Valuation allowance	(128,695,371)	(95,085,045)
Deferred tax liabilities:
State taxes	(13,804,268)	(10,282,834)
Fixed assets	(38,945)	(84,714)
Total deferred tax liability	$ (13,843,213)	$ (10,367,548)