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Stock-based Compensation (Tables) | 9 Months Ended
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Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock-Based Compensation Expenses | Stock-based compensation expense was reported as follows in the condensed consolidated statements of operations:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | June 30, |  |  | June 30, |
(Dollars in thousands) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Product costs |  | $ | 34 |  |  | $ | 34 |  |  | $ | 82 |  |  | $ | 98 |
Research and development |  |  | 189 |  |  |  | 225 |  |  |  | 619 |  |  |  | 617 |
Selling, general and administrative |  |  | 1,117 |  |  |  | 1,060 |  |  |  | 3,336 |  |  |  | 2,794 |
Total |  | $ | 1,340 |  |  | $ | 1,319 |  |  | $ | 4,037 |  |  | $ | 3,509 |
Stock Option Fair Value Assumptions and Weighted Average Fair Value of Stock Options Granted |
|  | Three Months Ended |  |  | Nine Months Ended |  |
|  | June 30, |  |  | June 30, |  |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |  |
Stock option fair value assumptions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rates |  |  | 0.3 | % |  |  | 2.2 | % |  |  | 1.5 | % |  |  | 2.8 | % |
Expected life (years) |  |  | 4.7 |  |  |  | 4.6 |  |  |  | 4.6 |  |  |  | 4.5 |  |
Expected volatility |  |  | 42.5 | % |  |  | 36.0 | % |  |  | 38.4 | % |  |  | 33.6 | % |
Dividend yield |  |  | — | % |  |  | — | % |  |  | — | % |  |  | — | % |
Weighted average grant date fair value of stock options granted |  | $ | 13.00 |  |  | $ | 13.38 |  |  | $ | 14.13 |  |  | $ | 17.91 |  |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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