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Stockholders' Equity (Tables)
 3 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Stock-Based Compensation Expense Related to Stock Options and RSUs
The following table summarizes stock-based compensation expense related to stock options and RSUs, which was allocated as follows (amounts shown in thousands):
 
Three Months Ended December 31,
 
2017
 
2016
Cost of revenue
$
18

 
$
12

Selling and marketing
641

 
347

Research and development
367

 
208

General and administrative
863

 
518

Stock-based compensation expense included in expenses
$
1,889

 
$
1,085
Fair Value Calculations for Stock-Based Compensation Awards
The fair value calculations for stock-based compensation awards to employees for the three months ended December 31, 2017 and 2016 were based on the following assumptions:
 
Three Months Ended December 31, 2017
 
Three Months Ended December 31, 2016
Risk-free interest rate
2.04%
 
1.68% – 1.92%
Expected life (years)
5.15
 
5.30
Expected volatility
60%
 
78%
Expected dividends
None
 
None
Stock Option Activity
The following table summarizes stock option activity under the Company’s equity plans during the three months ended December 31, 2017:
 
Number of
Shares
 
Weighted-Average
Exercise Price
 
Weighted-Average
Remaining
Contractual Term
(in Years)
Outstanding, September 30, 2017
2,845,866

 
$
4.21

 
5.4
Granted
299,397

 
$
8.60

 
 
Exercised
(63,329
)
 
$
2.16

 
 
Canceled
(19,667
)
 
$
3.89

 
 
Outstanding, December 31, 2017
3,062,267

 
$
4.68

 
5.6
RSU Activity
The following table summarizes RSU activity under the Company’s equity plans during the three months ended December 31, 2017:
 
Number of
Shares
 
Weighted-Average
Fair Market Value
Per Share
Outstanding, September 30, 2017
2,357,021

 
$
5.65

Granted
915,779

 
$
8.60

Settled
(449,622
)
 
$
4.83

Canceled
(36,926
)
 
$
8.21

Outstanding, December 31, 2017
2,786,252

 
$
6.69