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STOCKHOLDERS' EQUITY (Tables)
 12 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Fair Value Calculations for Stock-Based Compensation Awards
The fair value calculations for stock-based compensation awards to employees for the fiscal years ended September 30, 2017, 2016, and 2015 were based on the following assumptions:
 
2017
 
2016
 
2015
Risk-free interest rate
1.68% – 1.92%
 
1.43% – 1.66%
 
1.29% – 1.66%
Expected life (years)
5.25
 
5.90
 
5.30
Expected volatility
74%
 
83%
 
90%
Expected dividends
None
 
None
 
None
Stock-Based Compensation Expense Related to Stock Options and RSUs
The following table summarizes stock-based compensation expense under ASC 718 for the fiscal years ended September 30, 2017, 2016, and 2015, which were allocated as follows (amounts shown in thousands):
 
2017
 
2016
 
2015
Cost of revenue
$
52

 
$
39

 
$
30

Sales and marketing
1,577

 
1,099

 
713

Research and development
1,028

 
660

 
592

General and administrative
2,821

 
2,281

 
2,032

Stock-based compensation expense related to employee
   stock options included in expenses
$
5,478

 
$
4,079

 
$
3,367
Stock Option Activity
The following table summarizes stock option activity under the Company’s stock option plans during the fiscal years ended September 30, 2017, 2016, and 2015: 
 
Number of
Shares
 
Weighted
Average
Exercise Price
Per Share
 
Weighted
Average
Remaining
Contractual Term
(in Years)
Outstanding, September 30, 2014
2,334,326

 
$
4.11

 
5.5
Granted
1,927,500

 
$
2.92

 
 
Exercised
(232,203
)
 
$
1.06

 
 
Cancelled
(381,918
)
 
$
3.85

 
 
Outstanding, September 30, 2015
3,647,705

 
$
3.70

 
7.2
Granted
98,500

 
$
4.51

 
 
Exercised
(661,663
)
 
$
2.67

 
 
Cancelled
(69,168
)
 
$
4.51

 
 
Outstanding, September 30, 2016
3,015,374

 
$
3.95

 
6.4
Granted
147,800

 
$
7.06

 
 
Exercised
(235,514
)
 
$
2.92

 
 
Cancelled
(81,794
)
 
$
3.59

 
 
Outstanding, September 30, 2017
2,845,866

 
$
4.21

 
5.4
RSU Activity
The following table summarizes RSU activity in the fiscal years ended September 30, 2017, 2016, and 2015:
 
Number of
shares
 
Weighted-
average
fair value
per share
Outstanding at September 30, 2014
1,101,303

 
$
4.71

Granted
104,000

 
$
2.29

Settled
(255,041
)
 
$
2.96

Cancelled
(147,345
)
 
$
3.54

Outstanding at September 30, 2015
802,917

 
$
4.49

Granted
1,536,000

 
$
4.82

Settled
(261,621
)
 
$
4.77

Cancelled
(31,127
)
 
$
4.19

Outstanding at September 30, 2016
2,046,169

 
$
4.90

Granted
1,249,224

 
$
6.61

Settled
(707,174
)
 
$
4.81

Cancelled
(231,198
)
 
$
4.93

Outstanding at September 30, 2017
2,357,021

 
$
5.65