Stock-based Compensation (Tables)

9 Months Ended

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