Stock-based Compensation (Tables)

9 Months Ended

Jun. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation Expenses

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,
(Dollars in thousands)	2020		2019		2020		2019
Product costs	$	34	$	34	$	82	$	98
Research and development		189		225		619		617
Selling, general and administrative		1,117		1,060		3,336		2,794
Total	$	1,340	$	1,319	$	4,037	$	3,509

Stock Option Fair Value Assumptions and Weighted Average Fair Value of Stock Options Granted

	Three Months Ended						Nine Months Ended
	June 30,						June 30,
	2020			2019			2020			2019
Stock option fair value assumptions:
Risk-free interest rates		0.3	%		2.2	%		1.5	%		2.8	%
Expected life (years)		4.7			4.6			4.6			4.5
Expected volatility		42.5	%		36.0	%		38.4	%		33.6	%
Dividend yield		—	%		—	%		—	%		—	%
Weighted average grant date fair value of stock     options granted	$	13.00		$	13.38		$	14.13		$	17.91