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Equity and Stock-Based Compensation (Tables) | 12 Months Ended
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Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based compensation plans | Stock-based compensation plans as of September 30, 2017 are summarized in the table below:
Name of Plan |  | Shares Authorized |  | Shares Available |  | Options Outstanding |  | Plan Expiration
2007 Employee Stock Incentive Plan |  | 3,000,000 |  |  | 686,032 |  |  | 1,342,391 |  |  | Mar. 2020
1998 Employee Stock Option Plan |  | 500,000 |  |  | — |  |  | — |  |  | Jan. 2008
Non-Employee Directors Stock Option Plan |  | 500,000 |  |  | 107,600 |  |  | 218,050 |  |  | Mar. 2020
|  |  |  |  | 793,632 |  |  | 1,560,441 |  |  |
Schedule of stock option valuation assumptions | We estimate the fair value of stock option awards on the date of grant using the Black-Scholes option pricing model using the following assumptions:
| Years Ended September 30,
| 2017 |  | 2016 |  | 2015
Risk free interest rate | 2% |  | 2% |  | 2%
Expected life | 6 years |  | 6 years |  | 6 years
Dividend rate | 0% |  | 0% |  | 0%
Volatility | 63% |  | 63% |  | 67%
Stock option transactions and the options outstanding | Stock option transactions and the options outstanding are summarized as follows:
| Years Ended September 30,
| 2017 |  | 2016 |  | 2015
| Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price
Outstanding at beginning of period | 1,841,567 |  |  | $ | 8.15 |  |  | 1,627,477 |  |  | $ | 9.11 |  |  | 1,063,324 |  |  | $ | 7.37 |
Granted | 145,000 |  |  | 5.23 |  |  | 360,075 |  |  | 5.25 |  |  | 327,500 |  |  | 9.74 |
Assumed - merger | — |  |  |  |  |  | — |  |  | — |  |  | 367,229 |  |  | 14.19 |
Exercised | (317,986 | ) |  | 6.30 |  |  | (15,346 | ) |  | 3.28 |  |  | (94,701 | ) |  | 5.52 |
Forfeited/canceled | (108,140 | ) |  | 12.71 |  |  | (130,639 | ) |  | 12.86 |  |  | (35,875 | ) |  | 24.71 |
Outstanding at end of period | 1,560,441 |  |  | $ | 7.95 |  |  | 1,841,567 |  |  | $ | 8.15 |  |  | 1,627,477 |  |  | $ | 9.11 |
Exercisable at end of period | 1,055,865 |  |  | $ | 8.58 |  |  | 1,127,611 |  |  | $ | 8.92 |  |  | 1,002,421 |  |  | $ | 9.74 |
Weighted average grant-date fair value of options granted during the period | $ | 3.04 |  |  |  |  | $ | 3.03 |  |  |  |  | $ | 5.91 |  |  |
Stock options outstanding and exercisable | The following tables summarize information for stock options outstanding and exercisable as of September 30, 2017:
|  | Options Outstanding
Range of Exercise Prices |  | Number Outstanding |  | Remaining Contractual Life |  | Average Exercise Price |  | Aggregate Intrinsic Value
|  |  |  | (in years) |  |  |  | (in thousands)
2.95-4.87 |  | 169,459 |  |  | 5.36 |  | $ | 3.54 |  |  |
5.07-5.20 |  | 70,990 |  |  | 9.03 |  | 5.07 |  |  |
5.25-5.25 |  | 263,936 |  |  | 8.13 |  | 5.25 |  |  |
5.40-6.15 |  | 105,520 |  |  | 5.59 |  | 5.93 |  |  |
7.01-7.01 |  | 183,176 |  |  | 6.20 |  | 7.01 |  |  |
7.15-7.87 |  | 35,234 |  |  | 3.65 |  | 7.61 |  |  |
7.98-7.98 |  | 195,273 |  |  | 4.21 |  | 7.98 |  |  |
8.20-9.94 |  | 70,707 |  |  | 5.09 |  | 8.89 |  |  |
9.98-9.98 |  | 267,950 |  |  | 7.14 |  | 9.98 |  |  |
10.50-27.47 |  | 198,196 |  |  | 2.34 |  | 15.23 |  |  |
|  | 1,560,441 |  |  | 5.84 |  | $ | 7.95 |  |  | $ | 7,060 |
Vested and expected to vest as of September 30, 2017 |  | 1,559,021 |  |  | 5.84 |  | $ | 7.95 |  |  | $ | 7,052 |
|  | Options Exercisable
Range of Exercise Prices |  | Number Exercisable |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
|  |  |  |  |  | (in thousands)
2.95-4.87 |  | 132,793 |  |  | $ | 3.18 |  |  |
5.07-5.20 |  | 990 |  |  | 5.20 |  |  |
5.25-5.25 |  | 74,604 |  |  | 5.25 |  |  |
5.40-6.15 |  | 90,520 |  |  | 5.96 |  |  |
7.01-7.01 |  | 131,950 |  |  | 7.01 |  |  |
7.15-7.87 |  | 25,132 |  |  | 7.51 |  |  |
7.98-7.98 |  | 195,273 |  |  | 7.98 |  |  |
8.20-9.94 |  | 53,207 |  |  | 9.12 |  |  |
9.98-9.98 |  | 155,200 |  |  | 9.98 |  |  |
10.50-27.47 |  | 196,196 |  |  | 15.28 |  |  |
|  | 1,055,865 |  |  | 8.58 |  |  | $ | 4,356 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: 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=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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 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=96867065&loc=d3e5070-113901 + Details
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