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Stockholders' Equity (Tables)
 9 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Schedule of Stock-Based Compensation Expense Related to Stock Options and RSUs
The following table summarizes stock-based compensation expense related to RSUs, stock options, and ESPP shares, which was allocated as follows (amounts shown in thousands):
Three Months Ended June 30,Nine Months Ended June 30,
 2019201820192018
Cost of revenue$55 $25 $155 $54 
Selling and marketing705 596 2,242 1,977 
Research and development437 482 1,438 1,298 
General and administrative1,071 877 3,456 2,598 
Stock-based compensation expense included in expenses
$2,268 $1,980 $7,291 $5,927 
Schedule of Fair Value Calculations for Stock-Based Compensation Awards
The fair value calculations for stock-based compensation awards to employees for the nine months ended June 30, 2019 and 2018 were based on the following assumptions:
 Nine Months Ended June 30, 2019Nine Months Ended June 30, 2018
Risk-free interest rate
2.88% – 3.08%
2.04%  
Expected life (years)5.465.15
Expected volatility57%  60%  
Expected dividendsNone  None  
Schedule of Stock Option Activity
The following table summarizes stock option activity under the Company’s equity plans during the nine months ended June 30, 2019:
Number of
Shares
Weighted-Average
Exercise Price
Weighted-Average
Remaining
Contractual Term
(in Years)
Outstanding at September 30, 20182,806,364 $4.75 4.6
Granted364,368 $9.50 
Exercised(1,362,605)$3.24 
Canceled(143,562)$6.62 
Outstanding at June 30, 20191,664,565 $6.87 5.6
Schedule of RSU Activity
The following table summarizes RSU activity under the Company’s equity plans during the nine months ended June 30, 2019:
 
Number of
Shares
Weighted-Average
Fair Market Value
Per Share
Outstanding at September 30, 20182,580,176 $6.92 
Granted1,098,473 $9.66 
Settled(785,624)$6.25 
Canceled(395,354)$7.38 
Outstanding at June 30, 20192,497,671 $8.28