Stock-based Compensation (Tables)

3 Months Ended

Dec. 31, 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
	December 31,
(Dollars in thousands)	2018		2017
Product costs	$	32	$	(6	)
Research and development		213		158
Selling, general and administrative		986		751
Total	$	1,231	$	903

Assumptions Used in Stock Option Plans

	Three Months Ended
	December 31,
	2018			2017
Risk-free interest rates		2.9	%		2.0	%
Expected life (years)		4.5			4.8
Expected volatility		33.2	%		33.0	%
Dividend yield		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 December 31, 2018, taking into account the aforementioned forfeiture of Performance Shares:

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