Income Taxes - Components of the Net Deferred Tax (Liability) and Asset (Detail) (USD $)	Sep. 30, 2014	Sep. 30, 2013
Deferred tax assets:
Reserve for other receivables	$ 233,014	$ 1,026,010
Accrued compensation	1,313,354	159,015
Stock compensation	3,011,369	1,269,020
Capitalized research and development	13,536,745	3,985,025
Fair value adjustments	1,864,364	749,030
Net operating losses	42,268,526	52,133,035
Total deferred tax assets	62,227,372	59,321,135
Valuation allowance	(55,224,802)	(52,214,090)
Deferred tax liabilities:
State taxes	(6,277,587)	(5,042,010)
Equity investments	(7,675)
Intangible assets	(475,829)	(1,521,015)
Fixed assets	(241,479)	(544,020)
Total deferred tax liability	(7,002,570)	(7,107,045)
Net deferred tax assets