Notes Payable - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	May 01, 2012
Debt Instrument [Line Items]
Amortization period for monthly principal and interest	30 months
Debt instrument final payment accrued	$ 1,100,000	$ 299,000.0
Warrants to purchase shares			491,007
Warrant exercise price	2.78
Relative fair value of warrants		1,169,227
Debt discount amortization	505,000	180,000
Minimum sales level relative to projected NUEDEXTA revenues measured basis	3 months
Ratio of cash and cash equivalent to outstanding amount, Minimum	1.5
Additional default interest rate	5.00%
Loan Agreement [Member]
Debt Instrument [Line Items]
Date of Loan Agreement	May 31, 2012
Loan Agreement of term loan	30,000,000
Loan Agreement, interest rate	8.95%
Final payment of interest	7.00%
Percentage of principal to calculate warrants to issue	4.55%
Warrants to purchase shares	491,007
Warrant exercise price	2.78
Loan Agreement [Member] | Black-Scholes model [Member]
Debt Instrument [Line Items]
Relative fair value of warrants	$ 1,200,000
Common stock at issuance, fair value	$ 2.80
Period of contractual term	10 years
Weighted average volatility rate	96.70%
Dividend rate	0.00%
Risk-free interest rate	1.80%