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Stock-based Compensation Plans | 9 Months Ended
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Jun. 30, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock-based Compensation Plans | 7. Stock-based Compensation Plans The Company has stock-based compensation plans approved by its shareholders under which it grants stock options, restricted stock awards, restricted stock units and deferred stock units to officers, directors and key employees. 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, |
(In thousands) |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Product costs |  | $ | 62 |  |  | $ | 23 |  |  | $ | 170 |  |  | $ | 92 |
Research and development |  |  | 355 |  |  |  | 329 |  |  |  | 1,086 |  |  |  | 918 |
Selling, general and administrative |  |  | 1,382 |  |  |  | 1,104 |  |  |  | 3,942 |  |  |  | 3,308 |
Total |  | $ | 1,799 |  |  | $ | 1,456 |  |  | $ | 5,198 |  |  | $ | 4,318 |
As of June 30, 2022, unrecognized compensation costs related to non-vested awards totaled approximately $11.7 million, which is expected to be recognized over a weighted average period of approximately 2.4 years. Stock Option Awards The Company awards stock options to officers, directors and key employees and uses the Black-Scholes option pricing model to determine the fair value of stock options as of the date of each grant. Stock option grant activity was as follows:
|  | Nine Months Ended June 30, |
|  | 2022 |  |  | 2021 |
Stock option grant activity: |  |  |  |  |  |  |  |
Stock options granted |  |  | 312,000 |  |  |  | 244,000 |
Weighted average grant date fair value |  | $ | 16.11 |  |  | $ | 14.08 |
Weighted average exercise price |  | $ | 42.78 |  |  | $ | 39.24 |
Restricted Stock Awards During the nine months ended June 30, 2022 and 2021, the Company awarded 90,000 and 68,000 restricted stock shares, respectively, to certain key employees and officers with a weighted average grant date fair value per share of $43.02 and $38.06, respectively. Restricted Stock is valued based on the market value of the shares as of the date of grant. Restricted Stock Unit Awards During the nine months ended June 30, 2022 and 2021, the Company awarded 14,000 and 12,000 restricted stock units, respectively, (“RSUs”) to directors and to key employees in foreign jurisdictions with a weighted average grant date fair value per unit of $42.79 and $45.13, respectively. RSUs are valued based on the market value of the shares as of the date of grant. Employee Stock Purchase Plan Our U.S. employees are eligible to participate in the amended 1999 Employee Stock Purchase Plan (“ESPP”) approved by our shareholders. During the nine months ended June 30, 2022 and 2021, 10,000 and 8,000 shares were issued under the ESPP, respectively.

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