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Stock-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-Based Compensation Expense
Stock-based compensation expense is included in the consolidated results of operations as follows (in thousands):
 
Fiscal years ended September 30,
 
2016
 
2015
 
2014
Cost of sales
$
215

 
$
221

 
$
207

Sales and marketing
921

 
1,158

 
1,171

Research and development
590

 
561

 
636

General and administrative
1,923

 
1,941

 
1,933

Stock-based compensation before income taxes
3,649

 
3,881

 
3,947

Income tax benefit
(1,185
)
 
(1,343
)
 
(1,361
)
Stock-based compensation after income taxes
$
2,464

 
$
2,538

 
$
2,586
Schedule of Stock Option Activity
The following table summarizes our stock option activity (in thousands, except per common share amounts):
 
 
Options Outstanding
 
Weighted Average Exercised Price
 
Weighted Average Contractual Term (in years)
 
Aggregate Intrinsic Value (1)
Balance at September 30, 2015
 
4,800

 
$10.21
 
 
 
 
Granted
 
553

 
11.46
 
 
 
 
Exercised
 
(772
)
 
9.65
 
 
 
 
Forfeited / Canceled
 
(618
)
 
11.06
 
 
 
 
Balance at September 30, 2016
 
3,963

 
$10.36
 
4.5
 
$
6,078

 
 
 
 
 
 
 
 
 
Exercisable at September 30, 2016
 
2,857

 
$10.49
 
3.7
 
$
4,158

(1) The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $11.40 as of September 30, 2016, which would have been received by the option holders had all option holders exercised their options as of that date.
Schedule of Valuation Assumptions
The table below shows the weighted average fair value, which was determined based upon the fair value of each option on the grant date utilizing the Black-Scholes option-pricing model and the related assumptions:
 
Fiscal years ended September 30,
 
2016
 
2015
 
2014
Weighted average per option grant date fair value
$
3.90

 
$
2.98

 
$
4.35

Assumptions used for option grants:
 
 
 
 
 
Risk free interest rate
1.22% - 1.85%
 
1.57% - 1.85%
 
1.76% - 2.02%
Expected term
6.00 years
 
6.00 years
 
6.00 years
Expected volatility
32% - 33%
 
32% - 36%
 
38% - 40%
Weighted average volatility
32%
 
35%
 
40%
Expected dividend yield
0
 
0
 
0
Schedule of Weighted Average Exercise Price Range and Remaining Contractual Life
At September 30, 2016, the weighted average exercise price and remaining life of the stock options are as follows (in thousands, except remaining life and exercise price):
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
 
Options Outstanding
 
Weighted Average Remaining Contractual Life (In Years)
 
Weighted Average Exercise Price
 
Number of Shares Vested
 
Weighted Average Exercise Price
$7.40 - $8.03
 
611

 
4.35
 
$
7.74

 
460

 
$
7.85

$8.04 - $9.03
 
627

 
5.49
 
$
8.52

 
234

 
$
8.42

$9.04 - $9.68
 
685

 
5.00
 
$
9.53

 
662

 
$
9.53

$9.69 - $10.81
 
830

 
5.24
 
$
10.57

 
664

 
$
10.58

$10.82 - $12.63
 
724

 
5.13
 
$
12.10

 
351

 
$
11.73

$12.64 - $14.75
 
268

 
0.39
 
$
13.47

 
268

 
$
13.47

$14.76 - $15.23
 
218

 
1.16
 
$
15.23

 
218

 
$
15.23

$7.40 - $15.23
 
3,963

 
4.53
 
$
10.36

 
2,857

 
$
10.49
Schedule of Nonvested Restricted Stock Units
A summary of our non-vested restricted stock units as of September 30, 2016 and changes during the twelve months then ended is presented below (in thousands, except per common share amounts):
 
Number of Awards
 
Weighted Average Grant Date Fair Value
Nonvested at September 30, 2015
543

 
$
8.41

Granted
251

 
$
10.92

Vested
(185
)
 
$
8.55

Canceled
(104
)
 
$
8.13

Nonvested at September 30, 2016
505

 
$
9.67