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Stock-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2017
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,
 
2017
 
2016
 
2015
Cost of sales
$
213

 
$
215

 
$
221

Sales and marketing
1,348

 
921

 
1,158

Research and development
656

 
590

 
561

General and administrative
2,442

 
1,923

 
1,941

Stock-based compensation before income taxes
4,659

 
3,649

 
3,881

Income tax benefit
(1,536
)
 
(1,185
)
 
(1,343
)
Stock-based compensation after income taxes
$
3,123

 
$
2,464

 
$
2,538
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, 2016
 
3,963

 
$10.36
 
 
 
 
Granted
 
601

 
12.86
 
 
 
 
Exercised
 
(335
)
 
10.45
 
 
 
 
Forfeited / Canceled
 
(327
)
 
12.68
 
 
 
 
Balance at September 30, 2017
 
3,902

 
$10.54
 
4.2
 
$
3,593

 
 
 
 
 
 
 
 
 
Exercisable at September 30, 2017
 
2,746

 
$10.18
 
3.5
 
$
2,769

(1) The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $10.60 as of September 30, 2017, 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,
 
2017
 
2016
 
2015
Weighted average per option grant date fair value
$
4.63

 
$
3.90

 
$
2.98

Assumptions used for option grants:
 
 
 
 
 
Risk free interest rate
1.46% - 1.96%
 
1.22% - 1.85%
 
1.57% - 1.85%
Expected term
6.00 years
 
6.00 years
 
6.00 years
Expected volatility
33% - 34%
 
32% - 33%
 
32% - 36%
Weighted average volatility
34%
 
32%
 
35%
Expected dividend yield
0%
 
0%
 
0%
Schedule of Weighted Average Exercise Price Range and Remaining Contractual Life
At September 30, 2017, 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 - $8.30
 
858

 
4.01
 
$
7.95

 
623

 
$
7.92

$8.31 - $9.59
 
623

 
3.98
 
$
9.14

 
551

 
$
9.16

$9.60 - $10.52
 
554

 
4.02
 
$
9.86

 
405

 
$
9.84

$10.53 - $10.81
 
567

 
3.91
 
$
10.73

 
556

 
$
10.72

$10.82 - $12.63
 
604

 
4.82
 
$
12.11

 
394

 
$
11.96

$12.64 - $14.75
 
490

 
6.09
 
$
13.53

 
11

 
$
14.75

$14.76 - $15.23
 
206

 
0.16
 
$
15.23

 
206

 
$
15.23

$7.40 - $15.23
 
3,902

 
4.18
 
$
10.54

 
2,746

 
$
10.18
Schedule of Nonvested Restricted Stock Units
A summary of our non-vested restricted stock units as of September 30, 2017 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, 2016
505

 
$
9.67

Granted
285

 
$
12.77

Vested
(202
)
 
$
9.42

Canceled
(22
)
 
$
10.59

Nonvested at September 30, 2017
566

 
$
11.28