Stockholders' Equity (Tables)

12 Months Ended

Sep. 30, 2013

A following table summarizes all warrant activity for fiscal 2013 and 2012:


	Shares of Common Stock Purchasable Upon Exercise of Warrants			Weighted Average Exercise Price per Share		Range of Exercise Prices
Outstanding at September 30, 2011		6,155,170		$	1.43	$	1.43
Issued		491,007		$	2.78	$	2.78
Exercised		(5,445,061	)	$	1.43	$	1.43

Outstanding at September 30, 2012		1,201,116		$	1.98	$	1.43-$2.78
Exercised		(1,147,159	)	$	1.94	$	1.43-$2.78

Outstanding at September 30, 2013		53,957		$	2.78	$	2.78

Summaries of stock options outstanding and changes during fiscal 2013 are presented below.


	Number of Shares			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (In Years)		Aggregate Intrinsic Value
Outstanding at September 30, 2012		8,142,468		$	2.67
Granted		2,151,507		$	2.89
Exercised		(1,033,833	)	$	1.45
Forfeited		(437,101	)	$	3.08

Outstanding at September 30, 2013		8,823,041		$	2.85		7.4	$	14,106,009

Vested and expected to vest in the future at September 30, 2013		8,566,637		$	2.85		7.3	$	13,748,940

Exercisable at September 30, 2013		4,621,266		$	2.83		6.3	$	8,232,487

Assumptions used in the Black-Scholes model for options granted during fiscal 2013, 2012, and 2011 were as follows:


	2013	2012	2011
Expected volatility	82.7% — 84.1%	103.7% — 108.7%	103.7% — 108.0%
Weighted-average volatility.	83.7%	107.9%	107.7%
Average expected term in years	5.4	5.8	5.8
Risk-free interest rate (zero coupon U.S. Treasury Note) .	0.8% — 1.7%	0.9% — 1.3%	1.1% — 2.5%
Expected dividend yield	0%	0%	0%

The following table summarizes the RSU activities for fiscal 2013.


	Number of Shares			Weighted Average Grant Date Fair Value
Unvested at September 30, 2012		1,016,624		$	2.23
Granted		1,166,303		$	2.65
Vested		(513,188	)	$	2.64
Forfeited		(32,529	)	$	2.23

Unvested at September 30, 2013		1,637,210		$	2.40