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Stockholders' Equity (Tables)

12 Months Ended

Sep. 30, 2019

Equity [Abstract]

Schedule of Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense related to RSUs, stock options, and ESPP shares for the fiscal years ended September 30, 2019, 2018, and 2017, which were allocated as follows (amounts shown in thousands):

			2019						2018						2017
Cost of revenue			$	207					$	78					$	52
Selling and marketing			2,967						2,656						1,577
Research and development			2,013						1,801						1,028
General and administrative			4,450						4,415						2,821
Stock-based compensation expense included in expenses			$	9,637					$	8,950					$	5,478

Schedule of 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, 2019, 2018, and 2017 were based on the following assumptions:

			2019						2018						2017
Risk-free interest rate			1.85% – 3.08%						2.04%						1.68% – 1.92%
Expected life (years)			5.43						5.15						5.25
Expected volatility			57%						60%						74%
Expected dividends			—						—						—

Schedule of Stock Option Activity

The following table summarizes stock option activity under the Company’s stock option plans during the fiscal years ended September 30, 2019, 2018, and 2017: 

			Number of Shares						Weighted- Average Exercise Price Per Share						Weighted- Average Remaining Contractual Term (in Years)
Outstanding at September 30, 2016			3,015,374						$	3.95					6.4
Granted			147,800						$	7.06
Exercised			(235,514)						$	2.92
Canceled			(81,794)						$	3.59
Outstanding at September 30, 2017			2,845,866						$	4.21					5.4
Granted			299,397						$	8.60
Exercised			(250,823)						$	2.96
Canceled			(88,076)						$	5.23
Outstanding at September 30, 2018			2,806,364						$	4.75					4.6
Granted			409,368						$	9.59
Exercised			(1,384,647)						$	3.25
Canceled			(144,183)						$	6.62
Outstanding at September 30, 2019			1,686,902						$	7.00					5.4

Schedule of RSU Activity

The following table summarizes RSU activity in the fiscal years ended September 30, 2019, 2018, and 2017:

			Number of Shares						Weighted- Average Fair Value Per Share
Outstanding at September 30, 2016			2,046,169						$	4.90
Granted			1,249,224						$	6.61
Settled			(707,174)						$	4.81
Canceled			(231,198)						$	4.93
Outstanding at September 30, 2017			2,357,021						$	5.65
Granted			1,184,906						$	8.54
Settled			(745,197)						$	5.26
Canceled			(216,554)						$	7.39
Outstanding at September 30, 2018			2,580,176						$	6.92
Granted			1,147,976						$	9.67
Settled			(881,420)						$	6.53
Canceled			(494,245)						$	7.70
Outstanding at September 30, 2019			2,352,487						$	8.26

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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