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Stockholders' Equity (Tables)

12 Months Ended

Sep. 30, 2013

Equity [Abstract]

Summary of Warrant Activity

The following table summarizes warrant activity in the fiscal years ended September 30, 2013, 2012 and 2011:

		Number of shares				Weighted-average exercise price
Outstanding and exercisable at September 30, 2010			895,283			$	0.84
Granted			—
Exercised			(763,094	)		$	0.83
Cancelled			—
Outstanding and exercisable at September 30, 2011			132,189			$	0.91
Granted			—
Exercised			(125,522	)		$	0.91
Cancelled			—
Outstanding and exercisable at September 30, 2012			6,667			$	0.91
Granted			—
Exercised			—
Cancelled			—
Outstanding and exercisable at September 30, 2013			6,667			$	0.91

Fair Value Calculations for Stock-Based Compensation Awards to Employees

The fair value calculations for stock-based compensation awards to employees for the fiscal years ended September 30, 2013, 2012 and 2011 were based on the following assumptions:

		2013		2012		2011
Risk-free interest rate		0.18% - 1.20%		0.35% - 1.06%		0.26% - 2.26%
Expected life (years)		5.3		5.0		5.5
Expected volatility		175%		110%		193%
Expected dividends		None		None		None

Stock-Based Compensation Expense Related to Stock Options and RSUs

The following table summarizes stock-based compensation expense related to stock options and RSUs under ASC 718 for the fiscal years ended September 30, 2013, 2012 and 2011, which were allocated as follows:

		2013				2012				2011
Sales and marketing		$	433,130			$	471,716			$	235,710
Research and development			617,377				592,249				290,239
General and administrative			1,741,355				1,535,893				745,289
Stock-based compensation expense related to employee stock options included in operating expenses		$	2,791,862			$	2,599,858			$	1,271,238

Summary of Vested and Unvested Options, Weighted Average Exercise Price per Share, Weighted Average Remaining Term and Aggregate Intrinsic Value

The following table summarizes vested and unvested options, weighted average exercise price per share, weighted average remaining term and aggregate intrinsic value at September 30, 2013:

		Number of Shares				Weighted Average Exercise Price Per Share				Weighted Average Remaining Contractual Life (in Years)				Aggregate Intrinsic Value
Vested			1,454,952			$	3.26				6.05			$	4,177,830
Unvested			1,370,012			$	4.97				8.61				1,821,844
Total			2,824,964			$	4.09				7.29			$	5,999,673

Stock Option Activity

The following table summarizes stock option activity under the Company’s stock option plans during the fiscal years ended September 30, 2013, 2012 and 2011:

		Number of Shares				Weighted Average Exercise Price Per Share				Weighted Average Remaining Contractual Term (in Years)
Outstanding, September 30, 2010			4,534,328			$	0.66				6.21
Granted			976,531			$	3.70
Exercised			(942,639	)		$	0.53
Cancelled			(14,316	)		$	0.57
Outstanding, September 30, 2011			4,553,904			$	1.34				6.15
Granted			1,095,750			$	8.54
Exercised			(1,812,215	)		$	0.81
Cancelled			(325,153	)		$	6.41
Outstanding, September 30, 2012			3,512,286			$	3.39				6.46
Granted			651,563			$	3.63
Exercised			(1,103,582	)		$	0.90
Cancelled			(235,303	)		$	7.26
Outstanding, September 30, 2013			2,824,964			$	4.09				7.29

Significant Ranges of Outstanding and Exercisable Options

The following table summarizes significant ranges of outstanding and exercisable options as of September 30, 2013:

Range of Exercise Prices		Number of Options Outstanding				Weighted Average Remaining Contractual Life (in Years)				Weighted Average Exercise Price				Number of Exercisable Options				Weighted Average Exercise Price of Exercisable Options				Number of Unvested Options
$0.09 to $0.79			405,841				6.27			$	0.74				405,841			$	0.74				—
$0.80 to $1.95			360,695				2.43			$	0.94				360,695			$	0.94				—
$2.34 to $2.60			802,258				7.83			$	2.51				290,015			$	2.60				512,243
$3.33 to $9.97			951,586				8.76			$	5.81				271,013			$	7.17				680,573
$11.05 to $11.68			304,584				8.38			$	11.08				127,388			$	11.08				177,196
			2,824,964				7.29			$	4.09				1,454,952			$	3.26				1,370,012

Number of Stock Options Outstanding under Prior Plans

The following table summarizes the number of stock options outstanding under the Prior Plans as of September 30, 2013:

2000 Stock Option Plan			215,412
2002 Stock Option Plan			226,100
2006 Stock Option Plan			49,000
2010 Stock Option Plan			1,120,055
Total stock options outstanding under the Prior Plans			1,610,567

RSU Activity

The following table summarizes RSU activity in the fiscal years ended September 30, 2013, 2012 and 2011:

		Number of shares				Weighted-average fair value per share
Outstanding at September 30, 2010			—				—
Granted			300,000			$	5.12
Settled			—				—
Cancelled			—				—
Outstanding at September 30, 2011			300,000			$	5.12
Granted			255,835			$	8.44
Settled			—				—
Cancelled			(40,001	)		$	11.05
Outstanding at September 30, 2012			515,834			$	6.30
Granted			255,000			$	3.15
Settled			(50,829	)		$	7.76
Cancelled			(27,501	)		$	11.05
Outstanding at September 30, 2013			692,504			$	4.85

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