Stock-Based Compensation Plans (Tables)

12 Months Ended

Sep. 30, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation Expenses

The Company’s stock-based compensation expenses for the years ended September 30 were allocated to the following expense categories

	2016		2015		2014
Product costs	$	22	$	24	$	16
Research and development		324		226		175
Selling, general and administrative		3,498		2,131		3,146
Total stock-based compensation expense	$	3,844	$	2,381	$	3,337

Assumptions Used in Stock Option Plans

The assumptions used as inputs in the model for the years ended September 30 were as follows:

	2016			2015			2014
Risk-free interest rates		1.89	%		1.43	%		1.19	%
Expected life	4.6 years			4.5 years			4.6 years
Expected volatility		37	%		43	%		45	%
Dividend yield		0	%		0	%		0	%

Schedule of Stock Option Activity

The following table summarizes all stock options activity and stock options outstanding and exercisable under the stock option plans during fiscal 2016, 2015 and 2014:

	Number of Shares			Weighted Average Exercise Price
Outstanding at September 30, 2013		1,368,984		$	20.13
Granted		138,837			22.71
Exercised		(190,434	)		14.42
Forfeited and expired		(106,768	)		31.26
Outstanding at September 30, 2014		1,210,619			20.35
Granted		164,401			21.24
Exercised		(166,422	)		14.54
Forfeited and expired		(90,590	)		35.35
Outstanding at September 30, 2015		1,118,008			20.10
Granted		241,582			20.63
Exercised		(437,850	)		15.68
Forfeited and expired		(94,415	)		31.52
Outstanding at September 30, 2016		827,325		$	21.30
Exercisable at September 30, 2016		434,876		$	21.50

Schedule of Restricted Stock Awards Activity

The following table summarizes all restricted stock awards activity during fiscal 2016, 2015 and 2014:

	Number of Shares			Weighted Average Grant Price
Balance at September 30, 2013		5,234		$	23.88
Granted		22,155			22.67
Vested		(7,991	)		23.98
Forfeited		(774	)		22.58
Balance at September 30, 2014		18,624			22.45
Granted		18,073			21.84
Vested		(7,606	)		22.28
Forfeited		(1,316	)		22.16
Balance at September 30, 2015		27,775			22.12
Granted		20,108			20.14
Vested		(12,311	)		22.19
Forfeited		(2,439	)		21.17
Balance at September 30, 2016		33,133		$	20.96

Schedule of Fair Value at the Date of Grant

The aggregate number of shares that could be awarded to key employees if the minimum, target and maximum performance goals are met, based upon the fair value at the date of grant is as follows:

Performance Period	Minimum Shares		Target Shares		Maximum Shares
Fiscal 2014 - 2016		7,861		39,303		78,606
Fiscal 2015 – 2017		8,440		42,199		84,398
Fiscal 2016 – 2018		13,268		66,338		132,676