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Stock-Based Compensation (Tables) | 6 Months Ended
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Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock-Based Compensation Expense | Stock-based compensation expense is included in the consolidated results of operations as follows (in thousands):
| Three months ended March 31, |  | Six months ended March 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
Cost of sales | $ | 54 |  |  | $ | 51 |  |  | $ | 116 |  |  | $ | 105 |
Sales and marketing | 345 |  |  | 227 |  |  | 685 |  |  | 426 |
Research and development | 155 |  |  | 147 |  |  | 337 |  |  | 295 |
General and administrative | 601 |  |  | 478 |  |  | 1,190 |  |  | 888 |
Stock-based compensation before income taxes | 1,155 |  |  | 903 |  |  | 2,328 |  |  | 1,714 |
Income tax benefit | (382 | ) |  | (293 | ) |  | (757 | ) |  | (550 | )
Stock-based compensation after income taxes | $ | 773 |  |  | $ | 610 |  |  | $ | 1,571 |  |  | $ | 1,164 |
Schedule of Stock Option Activity | The following table summarizes our stock option activity (in thousands, except per common share amounts):
|  | Options Outstanding |  | Weighted Average Exercised Price |  | Weighted Average Contractual Term (in years) |  | Aggregate Intrinsic Value (1)
Balance at September 30, 2016 |  | 3,963 |  |  | $10.36 |  |  |  |
Granted |  | 598 |  |  | 12.87 |  |  |  |
Exercised |  | (305 | ) |  | 10.64 |  |  |  |
Forfeited / Canceled |  | (223 | ) |  | 13.30 |  |  |  |
Balance at March 31, 2017 |  | 4,033 |  |  | $10.55 |  | 4.7 |  | $ | 7,283 |
Exercisable at March 31, 2017 |  | 2,676 |  |  | $10.19 |  | 3.9 |  | $ | 5,459 |
(1) The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $11.90 as of March 31, 2017, which would have been received by the option holders had all option holders exercised their options as of that date. The intrinsic value of an option is the amount by which the fair value of the underlying stock exceeds its exercise price.
Schedule of Valuation Assumptions | The table below shows the weighted average fair value, which was determined based upon the fair value of each option on the grant date utilizing the Black-Scholes option-pricing model and the related assumptions:
| Six months ended March 31,
| 2017 |  | 2016
Weighted average per option grant date fair value | $4.64 |  | $3.92
Assumptions used for option grants: |  |  |
Risk free interest rate | 1.46% - 1.96% |  | 1.61% - 1.85%
Expected term | 6.00 years |  | 6.00 years
Expected volatility | 33% - 34% |  | 32%
Weighted average volatility | 34% |  | 32%
Expected dividend yield | 0 |  | 0
Schedule of Nonvested Restricted Stock Units | A summary of our non-vested restricted stock units as of March 31, 2017 and changes during the six months then ended is presented below (in thousands, except per common share amounts):
| Number of Awards |  | Weighted Average Grant Date Fair Value
Nonvested at September 30, 2016 | 505 |  |  | $ | 9.67 |
Granted | 283 |  |  | $ | 12.78 |
Vested | (178 | ) |  | $ | 9.31 |
Canceled | (3 | ) |  | $ | 10.89 |
Nonvested at March 31, 2017 | 607 |  |  | $ | 11.22 |

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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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