Stock-based Compensation (Tables)

9 Months Ended

Jun. 30, 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				Nine Months Ended
	June 30,				June 30,
(Dollars in thousands)	2019		2018		2019		2018
Product costs	$	34	$	26	$	98	$	43
Research and development		225		244		617		580
Selling, general and administrative		1,060		1,023		2,794		2,674
Total	$	1,319	$	1,293	$	3,509	$	3,297

Assumptions Used in Stock Option Plans

	Three Months Ended						Nine Months Ended
	June 30,						June 30,
	2019			2018			2019			2018
Risk-free interest rates		2.2	%		2.7	%		2.8	%		2.2	%
Expected life (years)		4.6			4.8			4.5			4.8
Expected volatility		36.0	%		33.0	%		33.6	%		33.0	%
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, 2019:

Performance Period	Minimum Shares		Target Shares		Maximum Shares
Fiscal 2017 – 2019		9,352		46,758		93,516