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Stock-Based Compensation (Tables) | 3 Months Ended
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Dec. 31, 2013
Summarize Information about Stock Options | The following tables summarize information about stock options:
| 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 |  | 105,000 |  |  |  | 7.98 |  |  |  |  |  |  |  |  |
Cancelled |  | (37,970) |  |  |  | 4.77 |  |  |  |  |  |  |  |  |
Exercised |  | (62,825) |  |  |  | 4.83 |  |  |  |  |  |  |  |  |
Balance At December 31, 201 3 |  | 3,423,490 |  |  | $ | 4.77 |  |  |  | 8.1 years |  |  | $ | 21,646,786 |
Exercisable At December 31, 201 3 |  | 1,377,779 |  |  | $ | 7.25 |  |  |  | 7.6 years |  |  | $ | 7,038,191 |
Assumptions Used to Value Stock Options | The assumptions used to value stock options are as follows:
|  | Three months ended December 31,
|  | 201 3 |  | 201 2
Dividend yield |  |  | — |  |  |  | — |
Risk-free interest rate |  |  | 1.90 | % |  |  | 0.7% to 1.0% |
Volatility |  |  | 69 | % |  |  | 69 | %
Expected life (in years) |  |  | 6.25 |  |  |  | 5.5 to 6.25 |
Weighted average grant date fair value per share of options granted |  | $ | 5.06 |  |  | $ | 1.51 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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