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Stockholders' Equity | 6 Months Ended
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Mar. 31, 2013
Equity [Abstract] |
Stockholders' Equity | NOTE 7. STOCKHOLDERS’ EQUITY At March 31, 2013, the Company had a total of 150,000,000 shares of capital stock authorized for issuance, consisting of 145,000,000 shares of Common Stock, par value $0.001, and 5,000,000 shares of Preferred Stock, par value $0.001. At March 31, 2013, 17,042,764 shares of Common Stock were outstanding; no shares of Preferred Stock were outstanding. At March 31, 2013, 3,369,960 shares were reserved for issuance upon exercise of options granted or available to grant under Arrowhead’s 2000 Stock Option Plan and 2004 Equity Incentive Plan. On September 30, 2011, the Company sold 1,458,917 shares of Common Stock at a price of $3.80 per share. Cash proceeds received in fiscal 2011 were $4.5 million; the balance of $1 million was recorded as subscription receivable. As of March 31, 2013, the subscription receivable had not been received, and it is not expected to be received. During the quarter ended March 31, 2013, the Company reversed the subscription receivable. On October 4, 2011, the Company completed a second closing of the offering in which the Company sold 138,158 shares of Common Stock at a price of $3.80 per share. Cash proceeds were $525,000. On October 20, 2011, the Company and Lincoln Park Capital Fund, LLC, an Illinois limited liability company (“LPC”) entered into a $15 million purchase agreement (the “Purchase Agreement”), together with a registration rights agreement, whereby LPC agreed to purchase up to $15 million of Common Stock, subject to certain limitations, from time to time during the three-year term of the Purchase Agreement. Additionally, the Company filed a registration statement with the U.S. Securities & Exchange Commission covering the resale of the shares that may be issued to LPC under the Purchase Agreement. On January 30, 2012, the SEC declared the registration statement effective for the resale of such shares. The Company has the right, in its sole discretion, over a 36-month period to sell up to $15 million of Common Stock (subject to certain limitations) to LPC, depending on certain conditions as set forth in the Purchase Agreement. As of March 31, 2013, the Company had drawn $1 million from the facility. On October 21, 2011 and October 24, 2011, the Company entered into Subscription Agreements with certain accredited investors (the “Series A Purchasers”), pursuant to which the Company issued and sold an aggregate of 1,015 shares of Series A Preferred Convertible Stock, $0.001 par value per share, at a purchase price of $1,000 per share. The aggregate purchase price paid for the shares of Series A Preferred was $1,015,000. On February 16, 2012, upon approval by the Company’s shareholders, 1,015 shares of Arrowhead Series A Preferred Convertible Stock, $0.001 par value per share, were converted to 275,782 shares of Common Stock. On October 21, 2011, the Company entered into a Subscription Agreement with an accredited investor, pursuant to which the Company issued and sold an aggregate of 675,000 shares of Common Stock, $0.001 par value per share, at a purchase price of $3.70 per share. The aggregate purchase price paid by the purchaser for the shares of Common Stock was $2,497,500. On August 10, 2012, the Company sold 2,260,869 units at a price of $2.76 per unit. Each unit consisted of one share of common stock and a warrant to purchase 0.75 shares of common stock at an exercise price of $3.25. Gross proceeds from the offering were $6.2 million excluding offering fees and expenses. In December 2012, the Company sold 1,825,079 units at a price of $2.26 per unit. Each unit consisted of one share of common stock and a warrant to purchase 0.5 shares of common stock. Gross proceeds from the offering were $4.1 million excluding offering fees and expenses. The exercise price of these warrants was $2.12 as of March 31, 2013. In January 2013, the Company sold 1,667,051 units at a price of $2.12 per unit. Each unit consisted of one share of common stock and a warrant to purchase 0.5 shares of common stock. Gross proceeds from the offering were $3.5 million excluding offering fees and expenses. The exercise price of these warrants was $2.14 as of March 31, 2013. 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. Gross proceeds were $36 million. No warrants were issued in the May 2013 financing. The following table summarizes information about warrants outstanding at March 31, 2013:
Exercise prices |  | Number of Warrants |  |  | Remaining Life in Years |
$70.60 |  |  | 94,897 |  |  |  | 4.1 |
$20.00 |  |  | 386,400 |  |  |  | 0.4 |
$5.00 |  |  | 1,155,023 |  |  |  | 1.7 |
$5.09 |  |  | 461,024 |  |  |  | 1.7 |
$1.38 |  |  | 322,150 |  |  |  | 2.7 |
$4.16 |  |  | 1,000 |  |  |  | 3.7 |
$3.25 |  |  | 1,695,654 |  |  |  | 3.4 |
$2.12 |  |  | 987,543 |  |  |  | 4.7 |
$2.83 |  |  | 79,013 |  |  |  | 3.4 |
$2.14 |  |  | 833,530 |  |  |  | 4.8 |
$2.65 |  |  | 39,301 |  |  |  | 3.4 |
Total warrants outstanding |  |  | 6,055,535 |  |  |  |  |

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- Definition The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 7, 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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