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Stockholders' Equity (Tables) | 12 Months Ended
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Sep. 30, 2016
Equity [Abstract] |
Fair Value Calculations for Stock-Based Compensation Awards | The fair value calculations for stock-based compensation awards to employees for the fiscal years ended September 30, 2016 and 2015 were based on the following assumptions:
|  | 2016 |  |  | 2015 |
Risk-free interest rate |  | 1.43% - 1.66% |  |  | 1.29% - 1.66% |
Expected life (years) |  | 5.9 |  |  | 5.3 |
Expected volatility |  |  | 83% |  |  |  | 90% |
Expected dividends |  | None |  |  | None |
Stock-Based Compensation Expense Related to Stock Options and RSUs | The following table summarizes stock-based compensation expense under ASC 718 for the fiscal years ended September 30, 2016, 2015 and 2014, which were allocated as follows (amounts shown in thousands):
|  | 2016 |  |  | 2015 |  |  | 2014 |
Sales and marketing |  | $ | 1,122 |  |  | $ | 743 |  |  | $ | 824 |
Research and development |  |  | 669 |  |  |  | 592 |  |  |  | 675 |
General and administrative |  |  | 2,288 |  |  |  | 2,032 |  |  |  | 1,945 |
Acquisition-related costs and expenses |  |  | 1,503 |  |  |  | 393 |  |  |  | — |
Stock-based compensation expense related to employee stock options included in operating expenses |  | $ | 5,582 |  |  | $ | 3,760 |  |  | $ | 3,444 |
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, 2016:
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Life (in Years) |  |  | Aggregate Intrinsic Value |
Vested |  |  | 2,107,825 |  |  | $ | 4.31 |  |  |  | 5.55 |  |  | $ | 9,491,803 |
Unvested |  |  | 907,549 |  |  | $ | 3.11 |  |  |  | 8.33 |  |  |  | 4,700,241 |
Total |  |  | 3,015,374 |  |  | $ | 3.95 |  |  |  | 6.39 |  |  | $ | 14,192,044 |
Stock Option Activity | The following table summarizes stock option activity under the Company’s stock option plans during the fiscal years ended September 30, 2016, 2015 and 2014:
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Term (in Years) |
Outstanding, September 30, 2013 |  |  | 2,824,964 |  |  | $ | 4.09 |  |  |  | 7.29 |
Granted |  |  | — |  |  | $ | — |  |  |  |  |
Exercised |  |  | (108,135 | ) |  | $ | 1.27 |  |  |  |  |
Cancelled |  |  | (382,503 | ) |  | $ | 4.77 |  |  |  |  |
Outstanding, September 30, 2014 |  |  | 2,334,326 |  |  | $ | 4.11 |  |  |  | 5.46 |
Granted |  |  | 1,927,500 |  |  | $ | 2.92 |  |  |  |  |
Exercised |  |  | (232,203 | ) |  | $ | 1.06 |  |  |  |  |
Cancelled |  |  | (381,918 | ) |  | $ | 3.85 |  |  |  |  |
Outstanding, September 30, 2015 |  |  | 3,647,705 |  |  | $ | 3.70 |  |  |  | 7.15 |
Granted |  |  | 98,500 |  |  | $ | 4.51 |  |  |  |  |
Exercised |  |  | (661,663 | ) |  | $ | 2.67 |  |  |  |  |
Cancelled |  |  | (69,168 | ) |  | $ | 4.51 |  |  |  |  |
Outstanding, September 30, 2016 |  |  | 3,015,374 |  |  | $ | 3.95 |  |  |  | 6.39 |
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, 2016:
2000 Stock Option Plan |  |  | 6,262 |
2002 Stock Option Plan |  |  | 36,750 |
2006 Stock Option Plan |  |  | 43,000 |
2010 Stock Option Plan |  |  | 1,012,716 |
Total stock options outstanding under the Prior Plans |  |  | 1,098,728 |
RSU Activity | The following table summarizes RSU activity in the fiscal years ended September 30, 2016, 2015 and 2014:
|  | Number of shares |  |  | Weighted- average fair value per share |
Outstanding at September 30, 2013 |  |  | 692,504 |  |  | $ | 4.85 |
Granted |  |  | 625,139 |  |  | $ | 4.83 |
Settled |  |  | (63,334 | ) |  | $ | 4.66 |
Cancelled |  |  | (153,006 | ) |  | $ | 5.03 |
Outstanding at September 30, 2014 |  |  | 1,101,303 |  |  | $ | 4.71 |
Granted |  |  | 104,000 |  |  | $ | 2.29 |
Settled |  |  | (255,041 | ) |  | $ | 2.96 |
Cancelled |  |  | (147,345 | ) |  | $ | 3.54 |
Outstanding at September 30, 2015 |  |  | 802,917 |  |  | $ | 4.49 |
Granted |  |  | 1,536,000 |  |  | $ | 4.82 |
Settled |  |  | (261,621 | ) |  | $ | 4.77 |
Cancelled |  |  | (31,127 | ) |  | $ | 4.19 |
Outstanding at September 30, 2016 |  |  | 2,046,169 |  |  | $ | 4.90 |

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