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Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted and outstanding to purchase	3,419,285	1,910,794	729,096
Number of Options Outstanding, Granted	1,509,166	1,229,500
Options granted outside of Equity Incentive plans	50,000
Stock-based compensation expense	$ 1,536,271	$ 1,241,404
Fair value of the options granted	2,843,575	4,091,117
Intrinsic value of the options exercised	554	0
Dividend yield	0.00%
Calando Pharmaceuticals Inc
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of the options granted		33,690
Pre-tax compensation expense	32,952
Weighted average period to recognize pre-tax compensation expense	2 years 3 months 18 days
Arrowhead
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Pre-tax compensation expense	$ 5,072,252
Weighted average period to recognize pre-tax compensation expense	3 years 1 month 6 days
2000 Stock Option Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserve for issuance	153,200
Options granted and outstanding to purchase	152,900
2004 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserve for issuance	2,965,185
Options granted and outstanding to purchase	2,965,185
Number of Options Outstanding, Granted	1,459,166

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Net number of non-option equity instruments granted to participants.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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