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Organization and Basis of Presentation (Policies) | 9 Months Ended
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Jun. 30, 2013
Nature of Business | Nature of Business Arrowhead Research Corporation is a biopharmaceutical company developing targeted RNAi therapeutics. The C ompany is leveraging its proprietary drug delivery technologies to develop targeted drugs based on the RNA interference (RNAi) mechanism that efficiently and specifically silence target genes. Arrowhead technologies also enable partners to create peptide-drug conjugates (PDCs) that specifically home to cell types of interest while sparing off-target tissues. Arrowhead’s pipeline includes programs in chronic hepatit is B virus, obesity, and cancer.
Financing and Liquidity | Financing and Liquidity The Company has historically financed its operations through the sale of equity securities of Arrowhead or its Subsidiaries. Development activities have required significant capital investment since the Company’s inception and we expect our current operations to continue to require cash investment to continue development. At June 30, 2013, the Company had $33.1 million in cash, including cash invested in short term investments, to fund operations. During the nine months ended June 30, 2013, the Company’s cash position increased $25.6 million. During the nine months ended June 30, 2013, the Company received $42.4 million from the issuance of equity, net of fees. Other cash collections were $1.6 million. The C ompany had cash outflow of $14.0 million related to its continuing operating activities. In September 2011, the Company entered into an equity line facility whereby it has the ability to draw capital up to $15 million, subject to certain provisions, including maintaining a minimum stock price of $2.00 per share. During fiscal 2012, the Company drew $1 million from this facility. During fiscal 2013, the Company has not made any draws on this facility. In December 2012, the Company sold 1.8 million units at a price of $2.26 per unit in a public offering. Each unit consisted of one share of Common Stock and a warrant to purchase 0.5 share of Common Stock. The exercise price of these warrants was $1.83 as of June 30, 2013. Proceeds net of expenses from the offering were $3.8 million. In January 2013, the Company sold 1.7 million units at a price of $2.12 per unit in a public offering. Each unit consisted of one share of Common Stock and a warrant to purchase 0.5 share of Common Stock. The exercise price of these warrants was $1.83 as of June 30, 2013. Proceeds net of expenses from the offering were $3.3 million. In May 2013, the Company sold 14.3 million shares of Arrowhead common stock at a price of $1.83 per share, and 9,900 shares of Arrowhead series B convertible preferred stock at a price of $1,000 per share. The series B preferred stock is convertible into common stock at a conversion price of $1.83. Proceeds, net of expenses from the offering, were $35.4 million.
Basis of Presentation and Principles of Consolidation | Basis of Presentation and Principles of Consolidation The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and in accordance with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, the financial statements do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, all adjustments, including normal recurring accruals, considered necessary for a fair presentation have been included. Interim results are not necessarily indicative of results for a full year. The September 30, 2012 balance sheet was derived from audited financial statements, but does not include all disclosures required by GAAP. This financial information should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended September 30, 2012. The consolidated financial statements of the Company include the accounts of Arrowhead and its wholly-owned and majority-owned Subsidiaries. Prior to April 2008, Arrowhead’s Subsidiaries included Insert Therapeutics, Inc. (“Insert”), which was merged with Calando in April 2008. The merged entity is majority-owned by Arrowhead and continues to operate under the name of Calando. Arrowhead sold its interests in Unidym and Tego in 2011 and 2009, respectively. Unidym and Tego results are included in the Income (Loss) from Discontinued Operations. Income (Loss) from Discontinued Operations also includes Aonex Technologies, Inc. (“Aonex”), sold in 2008 and Nanotechnica, Inc. (“Nanotechnica”), dissolved in 2005. All significant intercompany accounts and transactions are eliminated in consolidation, and noncontrolling interests are accounted for in the Company’s financial statements. Certain reclassifications have been made to prior period financial statements to conform to the current period presentation.
Use of Estimates | Use of Estimates The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the accompanying financial statements. Actual results could differ from those estimates.
Cash and Cash Equivalents | Cash and Cash Equivalents The Company considers cash and all highly liquid investments with an original maturity of three months or less at the date of purchase to be cash equivalents. Cash equivalents consist primarily of money market instruments that are maintained by an investment manager.
Investments | Investment s The Company invests excess cash balances in short-term and long-term marketable debt securities. Investments may consist of certificates of deposits, money market accounts, government-sponsored enterprise securities, corporate bonds and/or commercial paper. The Company accounts for its investment in marketable securities in accordance with FASB ASC 320, Investments – Debt and Equity Securities. This statement requires certain securities to be cl assified into three categories: Held-to-maturity – Debt securities that the entity has the positive intent and ability to hold to maturity are reported at amortized cost. Trading Securities – Debt and equity securities that are bought and held primarily for the purpose of selling in the near term are reported at fair value, with unrealized gains and losses included in earnings. Available-for-Sale – Debt and equity securities not classified as either securities held-to-maturity or trading securities are reported at fair value with unrealized gains or losses excluded from earnings and reported as a separate component of shareholders’ equity. The Company classifies its investments in marketable debt securities based on the facts and circumstances present at the time of purchase of the securities. At June 30, 2013, the Company classified all of its investments as held-to-maturity. Held-to-maturity investments are measured and recorded at amortized cost on the Company’s Consolidated Balance Sheet. Discounts and premiums to par value of the debt securities are amortized to interest income/expense over the term of the security. No gains or losses on investment securities are realized until they are sold or a decline in fair value is determined to be other-than-temporary. As of June 30, 2013, all short-term investments were comprised of corporate bonds with maturity dates of less than one year. The amortized cost of such bonds was $4,058,003. Gross unrealized losses were $17,208; there were no gross unrealized gains. Th e total fair value of the short-term investments was $4,040,795. As of September 30, 2012, short-term investments of $106,500 were comprised of equity securities of Wisepower as a result of our disposition of Unidym, such investment has been impaired and its carrying value has been reduced to zero. See further information regarding f air market value of marketa ble debt securities in footnote 10 – Fair Value Measurements & Derivative Instruments, such fair market data is obtained fr om independent pricing services.
Reverse Stock Split | Reverse Stock Split On November 17, 2011, the Company effected a 1 for 10 reverse stock split. As a result of the reverse stock split, each ten shares of the Company’s Common Stock issued and outstanding immediately prior to the reverse stock split were combined into one share of Common Stock. Also, as a result of the reverse stock split, the per share exercise price, and the number of shares of Common Stock underlying Company stock options, warrants, and any Common Stock based equity grants outstanding immediately prior to the reverse stock split was proportionally adjusted, based on the one-for-ten split ratio, in accordance with the terms of such options, warrants or other Common Stock based equity grants. Stockholders received a cash payment in lieu of any resulting fractional shares. All share and per share amounts in these financial statements have been retrospectively adjusted to reflect the reverse stock split. Unless otherwise noted, all impacted information has been retroactively adjusted to reflect this reverse stock split.

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