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Stockholders' Equity (Tables)

9 Months Ended

Jun. 30, 2018

Equity [Abstract]

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,
	2018				2017				2018				2017
Cost of revenue	$	25			$	12			$	54			$	42
Selling and marketing	596				371				1,977				1,113
Research and development	482				275				1,298				717
General and administrative	877				979				2,598				2,073
Stock-based compensation expense included in expenses	$	1,980			$	1,637			$	5,927			$	3,945

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, 2018 and 2017 were based on the following assumptions:

	Nine Months Ended June 30, 2018		Nine Months Ended June 30, 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 nine months ended June 30, 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	(186,505	)		$	2.65
Canceled	(87,742	)		$	5.24
Outstanding, June 30, 2018	2,871,016			$	4.73			5.4

RSU Activity

The following table summarizes RSU activity under the Company’s equity plans during the nine months ended June 30, 2018:

	Number of Shares			Weighted-Average Fair Market Value Per Share
Outstanding, September 30, 2017	2,357,021			$	5.65
Granted	1,010,842			$	8.55
Settled	(705,747	)		$	5.08
Canceled	(186,452	)		$	7.33
Outstanding, June 30, 2018	2,475,664			$	6.84

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References

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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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