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Stockholders' Equity (Tables)
 6 Months Ended
Mar. 31, 2018
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 March 31,
 
Six Months Ended March 31,
 
2018
 
2017
 
2018
 
2017
Cost of revenue
$
22

 
$
17

 
$
40

 
$
30

Selling and marketing
729

 
395

 
1,370

 
742

Research and development
449

 
234

 
816

 
441

General and administrative
858

 
577

 
1,721

 
1,095

Stock-based compensation expense included in expenses
$
2,058

 
$
1,223

 
$
3,947

 
$
2,308
Fair Value Calculations for Stock-Based Compensation Awards
 The fair value calculations for stock-based compensation awards to employees for the six months ended March 31, 2018 and 2017 were based on the following assumptions:
 
Six Months Ended March 31, 2018
 
Six Months Ended March 31, 2017
Risk-free interest rate
2.04%
 
1.68% – 1.92%
Expected life (years)
5.15
 
5.32
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 six months ended March 31, 2018:
 
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
(72,527
)
 
$
2.29

 
 
Canceled
(26,231
)
 
$
4.03

 
 
Outstanding, March 31, 2018
3,046,505

 
$
4.68

 
5.4
RSU Activity
The following table summarizes RSU activity under the Company’s equity plans during the six months ended March 31, 2018:
 
Number of
Shares
 
Weighted-Average
Fair Market Value
Per Share
Outstanding, September 30, 2017
2,357,021

 
$
5.65

Granted
961,809

 
$
8.56

Settled
(596,472
)
 
$
4.74

Canceled
(52,311
)
 
$
8.09

Outstanding, March 31, 2018
2,670,047

 
$
6.83