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Stockholders' Equity (Tables) | 12 Months Ended
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Sep. 30, 2013
Equity [Abstract] |
Summary of Warrant Activity | The following table summarizes warrant activity in the fiscal years ended September 30, 2013, 2012 and 2011:
|  | Number of shares |  |  | Weighted-average exercise price |
Outstanding and exercisable at September 30, 2010 |  |  | 895,283 |  |  | $ | 0.84 |
Granted |  |  | — |  |  |  |  |
Exercised |  |  | (763,094 | ) |  | $ | 0.83 |
Cancelled |  |  | — |  |  |  |  |
Outstanding and exercisable at September 30, 2011 |  |  | 132,189 |  |  | $ | 0.91 |
Granted |  |  | — |  |  |  |  |
Exercised |  |  | (125,522 | ) |  | $ | 0.91 |
Cancelled |  |  | — |  |  |  |  |
Outstanding and exercisable at September 30, 2012 |  |  | 6,667 |  |  | $ | 0.91 |
Granted |  |  | — |  |  |  |  |
Exercised |  |  | — |  |  |  |  |
Cancelled |  |  | — |  |  |  |  |
Outstanding and exercisable at September 30, 2013 |  |  | 6,667 |  |  | $ | 0.91 |
Fair Value Calculations for Stock-Based Compensation Awards to Employees | The fair value calculations for stock-based compensation awards to employees for the fiscal years ended September 30, 2013, 2012 and 2011 were based on the following assumptions:
|  | 2013 |  | 2012 |  | 2011
Risk-free interest rate |  | 0.18% - 1.20% |  | 0.35% - 1.06% |  | 0.26% - 2.26%
Expected life (years) |  | 5.3 |  | 5.0 |  | 5.5
Expected volatility |  | 175% |  | 110% |  | 193%
Expected dividends |  | None |  | None |  | None
Stock-Based Compensation Expense Related to Stock Options and RSUs | The following table summarizes stock-based compensation expense related to stock options and RSUs under ASC 718 for the fiscal years ended September 30, 2013, 2012 and 2011, which were allocated as follows:
|  | 2013 |  |  | 2012 |  |  | 2011 |
Sales and marketing |  | $ | 433,130 |  |  | $ | 471,716 |  |  | $ | 235,710 |
Research and development |  |  | 617,377 |  |  |  | 592,249 |  |  |  | 290,239 |
General and administrative |  |  | 1,741,355 |  |  |  | 1,535,893 |  |  |  | 745,289 |
Stock-based compensation expense related to employee stock options included in operating expenses |  | $ | 2,791,862 |  |  | $ | 2,599,858 |  |  | $ | 1,271,238 |
Summary of Vested and Unvested Options, Weighted Average Exercise Price per Share, Weighted Average Remaining Term and Aggregate Intrinsic Value | The following table summarizes vested and unvested options, weighted average exercise price per share, weighted average remaining term and aggregate intrinsic value at September 30, 2013:
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Life (in Years) |  |  | Aggregate Intrinsic Value |
Vested |  |  | 1,454,952 |  |  | $ | 3.26 |  |  |  | 6.05 |  |  | $ | 4,177,830 |
Unvested |  |  | 1,370,012 |  |  | $ | 4.97 |  |  |  | 8.61 |  |  |  | 1,821,844 |
Total |  |  | 2,824,964 |  |  | $ | 4.09 |  |  |  | 7.29 |  |  | $ | 5,999,673 |
Stock Option Activity | The following table summarizes stock option activity under the Company’s stock option plans during the fiscal years ended September 30, 2013, 2012 and 2011:
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Term (in Years) |
Outstanding, September 30, 2010 |  |  | 4,534,328 |  |  | $ | 0.66 |  |  |  | 6.21 |
Granted |  |  | 976,531 |  |  | $ | 3.70 |  |  |  |  |
Exercised |  |  | (942,639 | ) |  | $ | 0.53 |  |  |  |  |
Cancelled |  |  | (14,316 | ) |  | $ | 0.57 |  |  |  |  |
Outstanding, September 30, 2011 |  |  | 4,553,904 |  |  | $ | 1.34 |  |  |  | 6.15 |
Granted |  |  | 1,095,750 |  |  | $ | 8.54 |  |  |  |  |
Exercised |  |  | (1,812,215 | ) |  | $ | 0.81 |  |  |  |  |
Cancelled |  |  | (325,153 | ) |  | $ | 6.41 |  |  |  |  |
Outstanding, September 30, 2012 |  |  | 3,512,286 |  |  | $ | 3.39 |  |  |  | 6.46 |
Granted |  |  | 651,563 |  |  | $ | 3.63 |  |  |  |  |
Exercised |  |  | (1,103,582 | ) |  | $ | 0.90 |  |  |  |  |
Cancelled |  |  | (235,303 | ) |  | $ | 7.26 |  |  |  |  |
Outstanding, September 30, 2013 |  |  | 2,824,964 |  |  | $ | 4.09 |  |  |  | 7.29 |
Significant Ranges of Outstanding and Exercisable Options | The following table summarizes significant ranges of outstanding and exercisable options as of September 30, 2013:
Range of Exercise Prices |  | Number of Options Outstanding |  |  | Weighted Average Remaining Contractual Life (in Years) |  |  | Weighted Average Exercise Price |  |  | Number of Exercisable Options |  |  | Weighted Average Exercise Price of Exercisable Options |  |  | Number of Unvested Options |
$0.09 to $0.79 |  |  | 405,841 |  |  |  | 6.27 |  |  | $ | 0.74 |  |  |  | 405,841 |  |  | $ | 0.74 |  |  |  | — |
$0.80 to $1.95 |  |  | 360,695 |  |  |  | 2.43 |  |  | $ | 0.94 |  |  |  | 360,695 |  |  | $ | 0.94 |  |  |  | — |
$2.34 to $2.60 |  |  | 802,258 |  |  |  | 7.83 |  |  | $ | 2.51 |  |  |  | 290,015 |  |  | $ | 2.60 |  |  |  | 512,243 |
$3.33 to $9.97 |  |  | 951,586 |  |  |  | 8.76 |  |  | $ | 5.81 |  |  |  | 271,013 |  |  | $ | 7.17 |  |  |  | 680,573 |
$11.05 to $11.68 |  |  | 304,584 |  |  |  | 8.38 |  |  | $ | 11.08 |  |  |  | 127,388 |  |  | $ | 11.08 |  |  |  | 177,196 |
|  |  | 2,824,964 |  |  |  | 7.29 |  |  | $ | 4.09 |  |  |  | 1,454,952 |  |  | $ | 3.26 |  |  |  | 1,370,012 |
Number of Stock Options Outstanding under Prior Plans | The following table summarizes the number of stock options outstanding under the Prior Plans as of September 30, 2013:
2000 Stock Option Plan |  |  | 215,412 |
2002 Stock Option Plan |  |  | 226,100 |
2006 Stock Option Plan |  |  | 49,000 |
2010 Stock Option Plan |  |  | 1,120,055 |
Total stock options outstanding under the Prior Plans |  |  | 1,610,567 |
RSU Activity | The following table summarizes RSU activity in the fiscal years ended September 30, 2013, 2012 and 2011:
|  | Number of shares |  |  | Weighted-average fair value per share |
Outstanding at September 30, 2010 |  |  | — |  |  |  | — |
Granted |  |  | 300,000 |  |  | $ | 5.12 |
Settled |  |  | — |  |  |  | — |
Cancelled |  |  | — |  |  |  | — |
Outstanding at September 30, 2011 |  |  | 300,000 |  |  | $ | 5.12 |
Granted |  |  | 255,835 |  |  | $ | 8.44 |
Settled |  |  | — |  |  |  | — |
Cancelled |  |  | (40,001 | ) |  | $ | 11.05 |
Outstanding at September 30, 2012 |  |  | 515,834 |  |  | $ | 6.30 |
Granted |  |  | 255,000 |  |  | $ | 3.15 |
Settled |  |  | (50,829 | ) |  | $ | 7.76 |
Cancelled |  |  | (27,501 | ) |  | $ | 11.05 |
Outstanding at September 30, 2013 |  |  | 692,504 |  |  | $ | 4.85 |

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