Income Taxes - Components of the Net Deferred Tax (Liability) and Asset (Detail) - USD ($)	Sep. 30, 2015	Sep. 30, 2014
Deferred tax assets:
Reserve for other receivables		$ 233,014
Accrued compensation	$ 1,513,021	1,313,354
Stock compensation	6,571,774	3,011,369
Capitalized research and development		13,536,745
Fair value adjustments	2,850,125	1,864,364
Net operating losses	88,965,968	42,268,526
Intangible Assets	5,551,705
Total deferred tax assets	105,452,593	62,227,372
Valuation allowance	(95,085,045)	(55,224,802)
Deferred tax liabilities:
State taxes	(10,282,834)	(6,277,587)
Equity investments		(7,675)
Intangible assets		(475,829)
Fixed assets	(84,714)	(241,479)
Total deferred tax liability	$ (10,367,548)	$ (7,002,570)