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Stock-based Compensation (Tables) | 3 Months Ended
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Dec. 31, 2019
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 |
|  | December 31, |
(Dollars in thousands) |  | 2019 |  |  | 2018 |
Product costs |  | $ | 33 |  |  | $ | 32 |
Research and development |  |  | 262 |  |  |  | 213 |
Selling, general and administrative |  |  | 1,098 |  |  |  | 986 |
Total |  | $ | 1,393 |  |  | $ | 1,231 |
Assumptions Used in Stock Option Plans |
|  | Three Months Ended |
|  | December 31, |
|  | 2019 |  |  | 2018 |
Risk-free interest rates |  |  | 1.6 | % |  |  | 2.9 | %
Expected life (years) |  |  | 4.6 |  |  |  | 4.5 |
Expected volatility |  |  | 37.8 | % |  |  | 33.2 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %

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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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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