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Stockholders' Equity | 12 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Stockholders' Equity | NOTE 6. STOCKHOLDERS’ EQUITY At September 30, 2017, 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 per share, and 5,000,000 shares of Preferred Stock, par value $0.001 per share. At September 30, 2017, 74,785,426 shares of Common Stock were outstanding. At September 30, 2017, 8,902,416 shares of Common Stock were reserved for issuance upon exercise of options and vesting of restricted stock units granted or available for grant under Arrowhead’s 2004 Equity Incentive Plan and 2013 Incentive Plan, as well as for inducement grants made to new employees. During the year ended September 30, 2017, 15,652 shares of Series C Preferred Stock were converted into 2,670,989 shares of Common Stock. No preferred stock was outstanding as of September 30, 2017. On March 21, 2017, the Board of Directors (the “Board”) of the Company authorized and declared a dividend distribution of one right (a “Right”) for each outstanding share of Common Stock of the Company to stockholders of record at the close of business on March 22, 2017 (the “Record Date”). Each Right entitles the registered holder to purchase from the Company one one-thousandth of a share of Series D Junior Participating Preferred Stock, par value $0.001 per share (the “Preferred Shares”), of the Company at a purchase price of $20 per one one-thousandth of a Preferred Share (the “Purchase Price”). This portion of a share of Preferred Stock would give the holder thereof approximately the same dividend, voting and liquidation rights as would one share of Common Stock, with any variations set forth in the Certificate of Designation, Preferences, and Rights of Series D Junior Participating Preferred Stock attached hereto as Exhibit 3.3. The Rights become exercisable on the earlier of (i) 10 business days following a public announcement that a person has become an “Acquiring Person” by acquiring beneficial ownership of 15% or more of the Common Stock then outstanding, other than as a result of repurchases of Common Stock by the Company or certain inadvertent acquisitions; or (ii) 10 business days (or such later date as the Board shall determine prior to the time a person becomes an Acquiring Person) after the commencement of a tender offer or an exchange offer by or on behalf of any person (other than the Company and certain related entities) that, if completed, would result in such person becoming an Acquiring Person. In the event that a person becomes an Acquiring Person, each holder of a Right shall thereafter have the right to receive, upon exercise, Common Stock (or, in certain circumstances, other securities, cash, or other assets of the Company) having a value equal to two times the Purchase Price. The Rights expire on March 21, 2018. On September 28, 2016, the Company sold 1,256,983 shares of Common Stock to Amgen, Inc. at a price of $7.16 per share as part of the Common Stock Purchase Agreement executed with Amgen and discussed further in Note 2 – Collaboration and License Agreements – Amgen, Inc. The Company received proceeds of $9 million. On November 18, 2016, a second tranche of 1,745,810 shares was also sold to Amgen at a price of $7.16 per share as part of the Common Stock Purchase Agreement. The Company received proceeds of $12.5 million in November 2016. The following table summarizes information about warrants outstanding at September 30, 2017:
Exercise prices |  | Number of Warrants |  |  | Remaining Life in Years |
$ | 2.12 |  |  |  | 75,000 |  |  |  | 0.4 |
$ | 1.83 |  |  |  | 277,284 |  |  |  | 0.2 |
$ | 7.14 |  |  |  | 80,000 |  |  |  | 0.7 |
Total warrants outstanding |  |  | 432,284 |  |  |  |  |

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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