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Leases	12 Months Ended
Leases	Sep. 30, 2011
Leases [Abstract]
Leases	NOTE 6. *LEASES* In April 2011, the Company's corporate headquarters lease expired, and the Company did not exercise its renewal option. The company is currently leasing temporary offices. The temporary offices are expected to be utilized for several months at a rental rate of approximately $8,000 per month. The current rental agreement is on a month-to-month basis and there were no long-term commitments at September 30, 2011. On October 21, 2011, Arrowhead acquired the RNAi operations from Roche, including its research facility in Madison, Wisconsin. Its lease expires on February 28, 2019; monthly rental expense is approximately $56,500. Facility and equipment rent expense for the year ended September 30, 2011 and 2010 was $161,759 and $268,330, respectively. From inception to date, rent expense was $3,645,381. Rent expense related to Unidym, until its disposal in January 2011, is included as a part of income/loss from discontinued operations.

The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

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