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Stock-Based Compensation | 6 Months Ended
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Mar. 31, 2014
Stock-Based Compensation | NOTE 10. STOCK-BASED COMPENSATION Arrowhead has three plans that provide for equity-based compensation. Under the 2000 Stock Option Plan, 50,750 shares of Arrowhead’s Common Stock are reserved for issuance upon exercise of non-qualified stock options. No further grants can be made under the 2000 Stock Option Plan. The 2004 Equity Incentive Plan reserves 2,735,597 shares for the grant of stock options, stock appreciation rights, restricted stock awards and performance unit/share awards to employees, consultants and others. The 2013 Incentive Plan reserves 4,000,000 shares for the grant of stock options, stock appreciation rights, restricted stock awards and performance awards to employees, consultant and others. As of March 31, 2014, there were options granted and outstanding to purchase 50,750, 2,733,595 and 615,000 shares of Common Stock under the 2000 Stock Option Plan, the 2004 Equity Incentive Plan and the 2013 Incentive Plan, respectively. Also, as of March 31, 2014, there were 417,406 shares reserved for options issued outside of equity compensation plans as inducement grants to new employees. During the six months ended March 31, 2014, no options were granted under the 2004 Equity Incentive Plan, 615,000 were issued under the 2013 Incentive Plan and 165,000 options were granted outside of equity incentive plans as inducement stock options to new employees. The following tables summarize information about stock options:
| Unit/Share Number of Options Outstanding |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
Balance At September 30, 201 1 |  | 729,096 |  |  | $ | 9.03 |  |  |  |  |  |  |  |  |
Granted |  | 1,229,500 |  |  |  | 4.40 |  |  |  |  |  |  |  |  |
Cancelled |  | (42,919 | ) |  |  | 11.77 |  |  |  |  |  |  |  |  |
Exercised |  | (4,883 | ) |  |  | 5.20 |  |  |  |  |  |  |  |  |
Balance At September 30, 201 2 |  | 1,910,794 |  |  |  | 6.10 |  |  |  |  |  |  |  |  |
Granted |  | 1,509,166 |  |  |  | 2.03 |  |  |  |  |  |  |  |  |
Cancelled |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  | (675 | ) |  |  | 3.93 |  |  |  |  |  |  |  |  |
Balance At September 30, 201 3 |  | 3,419,285 |  |  | $ | 4.68 |  |  |  |  |  |  |  |  |
Granted |  | 780,000 |  |  |  | 13.51 |  |  |  |  |  |  |  |  |
Cancelled |  | (40,196 | ) |  |  | 4.68 |  |  |  |  |  |  |  |  |
Exercised |  | (342,338 | ) |  |  | 6.54 |  |  |  |  |  |  |  |  |
Balance At March 31, 2014 |  | 3,816,751 |  |  | $ | 5.81 |  |  |  | 7.5 years |  |  | $ | 38,622,771 |
Exercisable At March 31, 2014 |  | 1,351,974 |  |  | $ | 5.91 |  |  |  | 7.2 years |  |  | $ | 14,710,062 |
Stock-based compensation expense for the six months ended March 31, 2014 and 201 3 was $1,719,582 and $750,782, respectively. There is no income tax benefit as the Company is currently operating at a loss and an actual income tax benefit may not be realized. The loss creates a timing difference, resulting in a deferred tax asset, which is fully reserved by a valuation allowance. The fair value of the options granted by the Company during the three months ended March 31, 2014 and 201 3 is estimated at $7,085,656 and $103,293, respectively. The intrinsic value of the options exercised during the six months ended March 31, 2014 and 201 3 was $3,115,175 and $0, respectively; no options were exercised during the six months ended March 31, 2013. As of March 31, 2014, the pre-tax compensation expense for all unvested stock options in the amount of approximately $17,294,117 will be recognized in our results of operations over a weighted average period of 3.5 years. The fair value of each stock option award is estimated on the date of grant using the Black-Scholes option pricing model. The Black-Scholes option valuation model was developed for use in estimating the fair value of traded options, which do not have vesting restrictions and are fully transferable. The determination of the fair value of each stock option is affected by our stock price on the date of grant, as well as assumptions regarding a number of highly complex and subjective variables. Because the Company’s employee stock options have characteristics significantly different from those of traded options, and because changes in the subjective input assumptions can materially affect the fair value estimate, in management’s opinion, the existing models do not necessarily provide a reliable single measure of the fair value of its employee stock options. The assumptions used to value stock options are as follows:
|  | Six months ended March 31,
|  | 201 4 |  | 201 3
Dividend yield |  | — |  | —
Risk-free interest rate |  | 1.9% to 2.26% |  | 0.7% to 1.0%
Volatility |  | 69% |  | 69%
Expected life (in years) |  | 5.5 to 6.25 |  | 5.5 to 6.25
Weighted average grant date fair value per share of options granted |  | $9.08 |  | $1.31
The dividend yield is zero as the Company currently does not pay a dividend. The risk-free interest rate is based on the U.S. Treasury bond. Volatility is estimated based on volatility average of the Company’s Common Stock price. Restricted Stock Units Restricted Stock Units (RSUs) are granted under our 2013 Incentive Plan. During the quarter ended March 31, 2014, the Company issued 470,0 00 restricted stock units to certain members of management and certain members of its Board of Directors. At vesting each RSU will be exchanged for one share of the Company’s Common Stock. The RSUs issued to management vest in equal installments on the one and two year anniversary of the date of grant. The RSUs issued to the members of the Board of Directors vest upon the one year anniversary of the date of grant. The following table summarizes the activity of the Company’s Restricted Stock Units:
| Number of RSUs |  |  | Weighted- Average Grant Date Fair Value |  |  |
Unvested at September 30, 201 3 |  | - |  |  | $ | - |  |  |  |
Granted |  | 470,000 |  |  |  | 14.54 |  |  |  |
Vested |  | - |  |  |  | - |  |  |  |
Forfeited |  | - |  |  |  | - |  |  |  |
Unvested at March 31, 2014 |  | 470,000 |  |  | $ | 14.54 |  |  |  |
The Company recorded $570,707 and $0 of expense relating to restricted stock units during the six months ended March 31, 2014 and 2013 respectively, and such expense is included in stock-based compensation expense.

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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