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Stock-based Compensation (Tables) | 9 Months Ended
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Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock-Based Compensation Expenses | The Company’s stock-based compensation expenses were allocated to the following expense categories:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | June 30, |  |  | June 30, |
(Dollars in thousands) |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Product costs |  | $ | 26 |  |  | $ | 19 |  |  | $ | 43 |  |  | $ | 69 |
Research and development |  |  | 244 |  |  |  | 139 |  |  |  | 580 |  |  |  | 387 |
Selling, general and administrative |  |  | 1,023 |  |  |  | 790 |  |  |  | 2,674 |  |  |  | 2,164 |
Total |  | $ | 1,293 |  |  | $ | 948 |  |  | $ | 3,297 |  |  | $ | 2,620 |
Assumptions Used in Stock Option Plans |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Risk-free interest rates |  |  | 2.7 | % |  |  | 1.8 | % |  |  | 2.2 | % |  |  | 1.7 | %
Expected life (years) |  |  | 4.8 |  |  |  | 4.7 |  |  |  | 4.8 |  |  |  | 4.6 |
Expected volatility |  |  | 33.0 | % |  |  | 33.3 | % |  |  | 33.0 | % |  |  | 34.3 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Schedule of Fair Value at the Date of Grant | The aggregate number of shares that could be awarded to our executives if the minimum, target and maximum performance goals are met, based on the fair value at the date of grant is as follows as of June 30, 2018, taking into account the aforementioned forfeiture of Performance Shares:
Performance Period |  | Minimum Shares |  |  | Target Shares |  |  | Maximum Shares |
Fiscal 2016 – 2018 |  |  | 11,910 |  |  |  | 59,548 |  |  |  | 119,096 |
Fiscal 2017 – 2019 |  |  | 9,352 |  |  |  | 46,758 |  |  |  | 93,516 |

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- Definition Schedule of number of shares awarded to key employees. + References No definition available. + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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